diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index 45030acf..ea118360 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -5,7 +5,28 @@ on:
         types: [ published ]
 
 jobs:
+    test:
+        runs-on: ubuntu-latest
+        name: Run Tests Before Publishing
+
+        steps:
+            -   name: 📥 Checkout Code
+                uses: actions/checkout@v4
+
+            -   name: 🔧 Setup Node.js
+                uses: actions/setup-node@v4
+                with:
+                    node-version: '20.x'
+                    cache: 'npm'
+
+            -   name: 📦 Install Dependencies
+                run: npm ci
+
+            -   name: ✅ Run Tests
+                run: npm run test
+
     publish-prime:
+        needs: test
         runs-on: ubuntu-latest
         defaults:
             run:
@@ -30,6 +51,7 @@ jobs:
                     NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
 
     publish-plugin:
+        needs: test
         runs-on: ubuntu-latest
         permissions:
             contents: read
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index cdd190dd..acf8ae12 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -10,6 +10,29 @@ on:
         -   cron: '0 0 * * *' # Daily at midnight
 
 jobs:
+    javascript-tests:
+        runs-on: ubuntu-latest
+        name: JavaScript Tests
+
+        steps:
+            -   name: 📥 Checkout Code
+                uses: actions/checkout@v4
+
+            -   name: 🔧 Setup Node.js
+                uses: actions/setup-node@v4
+                with:
+                    node-version: '20.x'
+                    cache: 'npm'
+
+            -   name: 📦 Install Dependencies
+                run: npm ci
+
+            -   name: ✅ Run Tests
+                run: npm run test
+
+            -   name: 📊 Run Coverage
+                run: npm run test:coverage
+
     static-analysis:
         runs-on: ubuntu-latest
         strategy:
diff --git a/.gitignore b/.gitignore
index 90a2f7ee..e2ab1022 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,8 @@
 /vendor/
 /node_modules/
 
+/coverage/
+
 /.cache/php-cs-fixer/
 /.cache/phplint/
 /.cache/phpstan/
diff --git a/package-lock.json b/package-lock.json
index 2ce31c7d..aa398b27 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,6 +29,8 @@
                 "@types/node": "^22.19.11",
                 "@typescript-eslint/eslint-plugin": "^7.18.0",
                 "@typescript-eslint/parser": "^7.18.0",
+                "@vitest/coverage-v8": "^3.0.7",
+                "@vitest/ui": "^3.0.7",
                 "all-contributors-cli": "^6.26.1",
                 "autoprefixer": "^10.4.24",
                 "browserslist": "^4.28.1",
@@ -42,6 +44,7 @@
                 "eslint-plugin-babel": "^5.3.1",
                 "eslint-plugin-import": "^2.32.0",
                 "eslint-plugin-prettier": "^5.5.5",
+                "jsdom": "^26.0.0",
                 "postcss": "^8.5.6",
                 "postcss-discard-comments": "^7.0.5",
                 "punycode": "^2.3.1",
@@ -56,13 +59,28 @@
                 "sass": "^1.97.3",
                 "ts-node": "^10.9.2",
                 "tslib": "^2.8.1",
-                "typescript": "^5.9.3"
+                "typescript": "^5.9.3",
+                "vitest": "^3.0.7"
             },
             "engines": {
                 "node": ">=16.0.0",
                 "npm": ">=8.0.0"
             }
         },
+        "node_modules/@ampproject/remapping": {
+            "version": "2.3.0",
+            "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.3.0.tgz",
+            "integrity": "sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==",
+            "dev": true,
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@jridgewell/gen-mapping": "^0.3.5",
+                "@jridgewell/trace-mapping": "^0.3.24"
+            },
+            "engines": {
+                "node": ">=6.0.0"
+            }
+        },
         "node_modules/@antfu/eslint-config": {
             "version": "2.27.3",
             "resolved": "https://registry.npmjs.org/@antfu/eslint-config/-/eslint-config-2.27.3.tgz",
@@ -415,6 +433,27 @@
                 "url": "https://github.com/sponsors/antfu"
             }
         },
+        "node_modules/@asamuzakjp/css-color": {
+            "version": "3.2.0",
+            "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-3.2.0.tgz",
+            "integrity": "sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==",
+            "dev": true,
+            "license": "MIT",
+            "dependencies": {
+                "@csstools/css-calc": "^2.1.3",
+                "@csstools/css-color-parser": "^3.0.9",
+                "@csstools/css-parser-algorithms": "^3.0.4",
+                "@csstools/css-tokenizer": "^3.0.3",
+                "lru-cache": "^10.4.3"
+            }
+        },
+        "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
+            "version": "10.4.3",
+            "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
+            "integrity": "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==",
+            "dev": true,
+            "license": "ISC"
+        },
         "node_modules/@babel/code-frame": {
             "version": "7.29.0",
             "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz",
@@ -1942,6 +1981,16 @@
                 "node": ">=6.9.0"
             }
         },
+        "node_modules/@bcoe/v8-coverage": {
+            "version": "1.0.2",
+            "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+            "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+            "dev": true,
+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            }
+        },
         "node_modules/@clack/core": {
             "version": "0.3.5",
             "resolved": "https://registry.npmjs.org/@clack/core/-/core-0.3.5.tgz",
@@ -2005,6 +2054,121 @@
                 "@jridgewell/sourcemap-codec": "^1.4.10"
             }
         },
+        "node_modules/@csstools/color-helpers": {
+            "version": "5.1.0",
+            "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-5.1.0.tgz",
+            "integrity": "sha512-S11EXWJyy0Mz5SYvRmY8nJYTFFd1LCNV+7cXyAgQtOOuzb4EsgfqDufL+9esx72/eLhsRdGZwaldu/h+E4t4BA==",
+            "dev": true,
+            "funding": [
+                {
+                    "type": "github",
+                    "url": "https://github.com/sponsors/csstools"
+                },
+                {
+                    "type": "opencollective",
+                    "url": "https://opencollective.com/csstools"
+                }
+            ],
+            "license": "MIT-0",
+            "engines": {
+                "node": ">=18"
+            }
+        },
+        "node_modules/@csstools/css-calc": {
+            "version": "2.1.4",
+            "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-2.1.4.tgz",
+            "integrity": "sha512-3N8oaj+0juUw/1H3YwmDDJXCgTB1gKU6Hc/bB502u9zR0q2vd786XJH9QfrKIEgFlZmhZiq6epXl4rHqhzsIgQ==",
+            "dev": true,
+            "funding": [
+                {
+                    "type": "github",
+                    "url": "https://github.com/sponsors/csstools"
+                },
+                {
+                    "type": "opencollective",
+                    "url": "https://opencollective.com/csstools"
+                }
+            ],
+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "@csstools/css-parser-algorithms": "^3.0.5",
+                "@csstools/css-tokenizer": "^3.0.4"
+            }
+        },
+        "node_modules/@csstools/css-color-parser": {
+            "version": "3.1.0",
+            "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-3.1.0.tgz",
+            "integrity": "sha512-nbtKwh3a6xNVIp/VRuXV64yTKnb1IjTAEEh3irzS+HkKjAOYLTGNb9pmVNntZ8iVBHcWDA2Dof0QtPgFI1BaTA==",
+            "dev": true,
+            "funding": [
+                {
+                    "type": "github",
+                    "url": "https://github.com/sponsors/csstools"
+                },
+                {
+                    "type": "opencollective",
+                    "url": "https://opencollective.com/csstools"
+                }
+            ],
+            "license": "MIT",
+            "dependencies": {
+                "@csstools/color-helpers": "^5.1.0",
+                "@csstools/css-calc": "^2.1.4"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "@csstools/css-parser-algorithms": "^3.0.5",
+                "@csstools/css-tokenizer": "^3.0.4"
+            }
+        },
+        "node_modules/@csstools/css-parser-algorithms": {
+            "version": "3.0.5",
+            "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-3.0.5.tgz",
+            "integrity": "sha512-DaDeUkXZKjdGhgYaHNJTV9pV7Y9B3b644jCLs9Upc3VeNGg6LWARAT6O+Q+/COo+2gg/bM5rhpMAtf70WqfBdQ==",
+            "dev": true,
+            "funding": [
+                {
+                    "type": "github",
+                    "url": "https://github.com/sponsors/csstools"
+                },
+                {
+                    "type": "opencollective",
+                    "url": "https://opencollective.com/csstools"
+                }
+            ],
+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "@csstools/css-tokenizer": "^3.0.4"
+            }
+        },
+        "node_modules/@csstools/css-tokenizer": {
+            "version": "3.0.4",
+            "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-3.0.4.tgz",
+            "integrity": "sha512-Vd/9EVDiu6PPJt9yAh6roZP6El1xHrdvIVGjyBsHR0RYwNHgL7FJPyIIW4fANJNG6FtyZfvlRPpFI4ZM/lubvw==",
+            "dev": true,
+            "funding": [
+                {
+                    "type": "github",
+                    "url": "https://github.com/sponsors/csstools"
+                },
+                {
+                    "type": "opencollective",
+                    "url": "https://opencollective.com/csstools"
+                }
+            ],
+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            }
+        },
         "node_modules/@emnapi/core": {
             "version": "1.7.0",
             "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.7.0.tgz",
@@ -2054,6 +2218,448 @@
                 "node": ">=16"
             }
         },
+        "node_modules/@esbuild/aix-ppc64": {
+            "version": "0.27.3",
+            "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.3.tgz",
+            "integrity": "sha512-9fJMTNFTWZMh5qwrBItuziu834eOCUcEqymSH7pY+zoMVEZg3gcPuBNxH1EvfVYe9h0x/Ptw8KBzv7qxb7l8dg==",
+            "cpu": [
+                "ppc64"
+            ],
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "aix"
+            ],
+            "engines": {
+                "node": ">=18"
+            }
+        },
+        "node_modules/@esbuild/android-arm": {
+            "version": "0.27.3",
+            "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.3.tgz",
+            "integrity": "sha512-i5D1hPY7GIQmXlXhs2w8AWHhenb00+GxjxRncS2ZM7YNVGNfaMxgzSGuO8o8SJzRc/oZwU2bcScvVERk03QhzA==",
+            "cpu": [
+                "arm"
+            ],
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "android"
+            ],
+            "engines": {
+                "node": ">=18"
+            }
+        },
+        "node_modules/@esbuild/android-arm64": {
+            "version": "0.27.3",
+            "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.27.3.tgz",
+            "integrity": "sha512-YdghPYUmj/FX2SYKJ0OZxf+iaKgMsKHVPF1MAq/P8WirnSpCStzKJFjOjzsW0QQ7oIAiccHdcqjbHmJxRb/dmg==",
+            "cpu": [
+                "arm64"
+            ],
+            "dev": true,
+            "license": "MIT",
+            "optional": true,
+            "os": [
+                "android"
+            ],
+            "engines": {
+                "node": ">=18"
+            }
+        },
+        "node_modules/@esbuild/android-x64": {
+            "version": "0.27.3",
+            "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.27.3.tgz",
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+                "x64"
+            ],
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+            "license": "MIT",
+            "optional": true,
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+                "android"
+            ],
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+            }
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+            ],
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+            "optional": true,
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         "node_modules/xml-name-validator": {
             "version": "4.0.0",
             "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-4.0.0.tgz",
@@ -16797,6 +18786,13 @@
                 "node": ">=12"
             }
         },
+        "node_modules/xmlchars": {
+            "version": "2.2.0",
+            "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+            "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+            "dev": true,
+            "license": "MIT"
+        },
         "node_modules/y18n": {
             "version": "5.0.8",
             "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
diff --git a/package.json b/package.json
index 06f76e4b..63a9cb97 100644
--- a/package.json
+++ b/package.json
@@ -41,10 +41,16 @@
         "build": "cross-env NODE_ENV=production rollup -c",
         "clean": "rimraf src/*/Prime/Resources/dist",
         "link": "npm link --workspaces",
-        "ncu": "ncu -u && npm run ncu --workspaces"
+        "ncu": "ncu -u && npm run ncu --workspaces",
+        "test": "vitest run",
+        "test:watch": "vitest",
+        "test:coverage": "vitest run --coverage",
+        "test:ui": "vitest --ui"
     },
     "devDependencies": {
         "@antfu/eslint-config": "^2.27.3",
+        "@vitest/coverage-v8": "^3.0.7",
+        "@vitest/ui": "^3.0.7",
         "@babel/core": "^7.29.0",
         "@babel/preset-env": "^7.29.0",
         "@rollup/plugin-babel": "^6.1.0",
@@ -84,6 +90,8 @@
         "sass": "^1.97.3",
         "ts-node": "^10.9.2",
         "tslib": "^2.8.1",
-        "typescript": "^5.9.3"
+        "typescript": "^5.9.3",
+        "vitest": "^3.0.7",
+        "jsdom": "^26.0.0"
     }
 }
diff --git a/src/Prime/Resources/assets/flasher-plugin.ts b/src/Prime/Resources/assets/flasher-plugin.ts
index c3a5129f..db952eba 100644
--- a/src/Prime/Resources/assets/flasher-plugin.ts
+++ b/src/Prime/Resources/assets/flasher-plugin.ts
@@ -104,7 +104,9 @@ export default class FlasherPlugin extends AbstractPlugin {
             // Apply custom styles
             Object.entries(options.style).forEach(([key, value]) => {
                 if (value !== undefined && value !== null) {
-                    container.style.setProperty(key, String(value))
+                    // Convert camelCase to kebab-case for CSS property names
+                    const cssKey = key.replace(/([A-Z])/g, '-$1').toLowerCase()
+                    container.style.setProperty(cssKey, String(value))
                 }
             })
 
diff --git a/src/Prime/Resources/assets/flasher.ts b/src/Prime/Resources/assets/flasher.ts
index b6429310..85eba424 100644
--- a/src/Prime/Resources/assets/flasher.ts
+++ b/src/Prime/Resources/assets/flasher.ts
@@ -128,7 +128,7 @@ export default class Flasher extends AbstractPlugin {
             envelope.metadata.plugin = this.resolvePluginAlias(envelope.metadata.plugin)
             this.addThemeStyles(resolved, envelope.metadata.plugin)
             envelope.options = this.resolveOptions(envelope.options)
-            envelope.context = response.context as Context
+            envelope.context = resolved.context
         })
 
         return resolved
@@ -156,17 +156,32 @@ export default class Flasher extends AbstractPlugin {
         const functionRegex = /^function\s*(\w*)\s*\(([^)]*)\)\s*\{([\s\S]*)\}$/
         const arrowFunctionRegex = /^\s*(\(([^)]*)\)|[^=]+)\s*=>\s*([\s\S]+)$/
 
-        const match = func.match(functionRegex) || func.match(arrowFunctionRegex)
-        if (!match) {
+        const functionMatch = func.match(functionRegex)
+        const arrowMatch = func.match(arrowFunctionRegex)
+
+        if (!functionMatch && !arrowMatch) {
             return func
         }
 
-        const args = match[2]?.split(',').map((arg) => arg.trim()) ?? []
-        let body = match[3].trim()
+        let args: string[]
+        let body: string
 
-        // Arrow functions with a single expression can omit the curly braces and the return keyword
-        if (!body.startsWith('{')) {
-            body = `{ return ${body}; }`
+        if (functionMatch) {
+            // Regular function: body is already complete statements
+            args = functionMatch[2]?.split(',').map((arg) => arg.trim()).filter(Boolean) ?? []
+            body = functionMatch[3].trim()
+        } else {
+            // Arrow function: may need to wrap expression body with return
+            args = arrowMatch![2]?.split(',').map((arg) => arg.trim()).filter(Boolean) ?? []
+            body = arrowMatch![3].trim()
+
+            // Arrow functions with a single expression need return added
+            if (!body.startsWith('{')) {
+                body = `return ${body};`
+            } else {
+                // Remove outer braces for arrow functions with block body
+                body = body.slice(1, -1).trim()
+            }
         }
 
         try {
diff --git a/src/Prime/Resources/dist/flasher.esm.js b/src/Prime/Resources/dist/flasher.esm.js
index dc33683f..9a810d6a 100644
--- a/src/Prime/Resources/dist/flasher.esm.js
+++ b/src/Prime/Resources/dist/flasher.esm.js
@@ -190,7 +190,8 @@ class FlasherPlugin extends AbstractPlugin {
             container.dataset.position = options.position;
             Object.entries(options.style).forEach(([key, value]) => {
                 if (value !== undefined && value !== null) {
-                    container.style.setProperty(key, String(value));
+                    const cssKey = key.replace(/([A-Z])/g, '-$1').toLowerCase();
+                    container.style.setProperty(cssKey, String(value));
                 }
             });
             document.body.appendChild(container);
@@ -413,7 +414,7 @@ class Flasher extends AbstractPlugin {
             envelope.metadata.plugin = this.resolvePluginAlias(envelope.metadata.plugin);
             this.addThemeStyles(resolved, envelope.metadata.plugin);
             envelope.options = this.resolveOptions(envelope.options);
-            envelope.context = response.context;
+            envelope.context = resolved.context;
         });
         return resolved;
     }
@@ -428,20 +429,32 @@ class Flasher extends AbstractPlugin {
         return resolved;
     }
     resolveFunction(func) {
-        var _a, _b;
+        var _a, _b, _c, _d;
         if (typeof func !== 'string') {
             return func;
         }
         const functionRegex = /^function\s*(\w*)\s*\(([^)]*)\)\s*\{([\s\S]*)\}$/;
         const arrowFunctionRegex = /^\s*(\(([^)]*)\)|[^=]+)\s*=>\s*([\s\S]+)$/;
-        const match = func.match(functionRegex) || func.match(arrowFunctionRegex);
-        if (!match) {
+        const functionMatch = func.match(functionRegex);
+        const arrowMatch = func.match(arrowFunctionRegex);
+        if (!functionMatch && !arrowMatch) {
             return func;
         }
-        const args = (_b = (_a = match[2]) === null || _a === void 0 ? void 0 : _a.split(',').map((arg) => arg.trim())) !== null && _b !== void 0 ? _b : [];
-        let body = match[3].trim();
-        if (!body.startsWith('{')) {
-            body = `{ return ${body}; }`;
+        let args;
+        let body;
+        if (functionMatch) {
+            args = (_b = (_a = functionMatch[2]) === null || _a === void 0 ? void 0 : _a.split(',').map((arg) => arg.trim()).filter(Boolean)) !== null && _b !== void 0 ? _b : [];
+            body = functionMatch[3].trim();
+        }
+        else {
+            args = (_d = (_c = arrowMatch[2]) === null || _c === void 0 ? void 0 : _c.split(',').map((arg) => arg.trim()).filter(Boolean)) !== null && _d !== void 0 ? _d : [];
+            body = arrowMatch[3].trim();
+            if (!body.startsWith('{')) {
+                body = `return ${body};`;
+            }
+            else {
+                body = body.slice(1, -1).trim();
+            }
         }
         try {
             return new Function(...args, body);
diff --git a/src/Prime/Resources/dist/flasher.js b/src/Prime/Resources/dist/flasher.js
index 6a5ec738..2ed70d64 100644
--- a/src/Prime/Resources/dist/flasher.js
+++ b/src/Prime/Resources/dist/flasher.js
@@ -196,7 +196,8 @@
                 container.dataset.position = options.position;
                 Object.entries(options.style).forEach(([key, value]) => {
                     if (value !== undefined && value !== null) {
-                        container.style.setProperty(key, String(value));
+                        const cssKey = key.replace(/([A-Z])/g, '-$1').toLowerCase();
+                        container.style.setProperty(cssKey, String(value));
                     }
                 });
                 document.body.appendChild(container);
@@ -419,7 +420,7 @@
                 envelope.metadata.plugin = this.resolvePluginAlias(envelope.metadata.plugin);
                 this.addThemeStyles(resolved, envelope.metadata.plugin);
                 envelope.options = this.resolveOptions(envelope.options);
-                envelope.context = response.context;
+                envelope.context = resolved.context;
             });
             return resolved;
         }
@@ -434,20 +435,32 @@
             return resolved;
         }
         resolveFunction(func) {
-            var _a, _b;
+            var _a, _b, _c, _d;
             if (typeof func !== 'string') {
                 return func;
             }
             const functionRegex = /^function\s*(\w*)\s*\(([^)]*)\)\s*\{([\s\S]*)\}$/;
             const arrowFunctionRegex = /^\s*(\(([^)]*)\)|[^=]+)\s*=>\s*([\s\S]+)$/;
-            const match = func.match(functionRegex) || func.match(arrowFunctionRegex);
-            if (!match) {
+            const functionMatch = func.match(functionRegex);
+            const arrowMatch = func.match(arrowFunctionRegex);
+            if (!functionMatch && !arrowMatch) {
                 return func;
             }
-            const args = (_b = (_a = match[2]) === null || _a === void 0 ? void 0 : _a.split(',').map((arg) => arg.trim())) !== null && _b !== void 0 ? _b : [];
-            let body = match[3].trim();
-            if (!body.startsWith('{')) {
-                body = `{ return ${body}; }`;
+            let args;
+            let body;
+            if (functionMatch) {
+                args = (_b = (_a = functionMatch[2]) === null || _a === void 0 ? void 0 : _a.split(',').map((arg) => arg.trim()).filter(Boolean)) !== null && _b !== void 0 ? _b : [];
+                body = functionMatch[3].trim();
+            }
+            else {
+                args = (_d = (_c = arrowMatch[2]) === null || _c === void 0 ? void 0 : _c.split(',').map((arg) => arg.trim()).filter(Boolean)) !== null && _d !== void 0 ? _d : [];
+                body = arrowMatch[3].trim();
+                if (!body.startsWith('{')) {
+                    body = `return ${body};`;
+                }
+                else {
+                    body = body.slice(1, -1).trim();
+                }
             }
             try {
                 return new Function(...args, body);
diff --git a/src/Prime/Resources/dist/flasher.min.js b/src/Prime/Resources/dist/flasher.min.js
index d34b9128..62b72f2d 100644
--- a/src/Prime/Resources/dist/flasher.min.js
+++ b/src/Prime/Resources/dist/flasher.min.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).flasher=t()}(this,(function(){"use strict";function e(e,t,s,n){return new(s||(s=Promise))((function(r,o){function i(e){try{a(n.next(e))}catch(e){o(e)}}function l(e){try{a(n.throw(e))}catch(e){o(e)}}function a(e){var t;e.done?r(e.value):(t=e.value,t instanceof s?t:new s((function(e){e(t)}))).then(i,l)}a((n=n.apply(e,t||[])).next())}))}"function"==typeof SuppressedError&&SuppressedError;class t{success(e,t,s){this.flash("success",e,t,s)}error(e,t,s){this.flash("error",e,t,s)}info(e,t,s){this.flash("info",e,t,s)}warning(e,t,s){this.flash("warning",e,t,s)}flash(e,t,s,n){let r,o,i,l={};if("object"==typeof e?(l=Object.assign({},e),r=l.type,o=l.message,i=l.title,delete l.type,delete l.message,delete l.title):"object"==typeof t?(l=Object.assign({},t),r=e,o=l.message,i=l.title,delete l.message,delete l.title):(r=e,o=t,null==s?(i=void 0,l=n||{}):"string"==typeof s?(i=s,l=n||{}):"object"==typeof s&&(l=Object.assign({},s),"title"in l?(i=l.title,delete l.title):i=void 0,n&&"object"==typeof n&&(l=Object.assign(Object.assign({},l),n)))),!r)throw new Error("Type is required for notifications");if(null==o)throw new Error("Message is required for notifications");null==i&&(i=r.charAt(0).toUpperCase()+r.slice(1));const a={type:r,message:o,title:i,options:l,metadata:{plugin:""}};this.renderOptions({}),this.renderEnvelopes([a])}}class s extends t{constructor(e){if(super(),this.options={timeout:null,timeouts:{success:1e4,info:1e4,error:1e4,warning:1e4},fps:30,position:"top-right",direction:"top",rtl:!1,style:{},escapeHtml:!1},!e)throw new Error("Theme is required");if("function"!=typeof e.render)throw new TypeError("Theme must have a render function");this.theme=e}renderEnvelopes(e){if(!(null==e?void 0:e.length))return;const t=()=>{e.forEach((e=>{var t,s,n,r;try{const o=null!==(s=null!==(t=this.options.timeout)&&void 0!==t?t:this.options.timeouts[e.type])&&void 0!==s?s:1e4,i=Object.assign(Object.assign(Object.assign({},this.options),e.options),{timeout:this.normalizeTimeout(null!==(n=e.options.timeout)&&void 0!==n?n:o),escapeHtml:null!==(r=e.options.escapeHtml)&&void 0!==r?r:this.options.escapeHtml}),l=this.createContainer(i),a={direction:i.direction,timeout:Number(i.timeout||0),fps:i.fps,rtl:i.rtl,escapeHtml:i.escapeHtml};this.addToContainer(l,e,a)}catch(t){console.error("PHPFlasher: Error rendering envelope",t,e)}}))};"loading"===document.readyState?document.addEventListener("DOMContentLoaded",t):t()}renderOptions(e){e&&(this.options=Object.assign(Object.assign({},this.options),e))}createContainer(e){let t=document.querySelector(`.fl-wrapper[data-position="${e.position}"]`);return t||(t=document.createElement("div"),t.className="fl-wrapper",t.dataset.position=e.position,Object.entries(e.style).forEach((([e,s])=>{null!=s&&t.style.setProperty(e,String(s))})),document.body.appendChild(t)),t.dataset.turboTemporary="",t}addToContainer(e,t,s){s.escapeHtml&&(t.title=this.escapeHtml(t.title),t.message=this.escapeHtml(t.message));const n=this.stringToHTML(this.theme.render(t));n.classList.add("fl-container"),s.rtl&&n.classList.add("fl-rtl"),"bottom"===s.direction?e.append(n):e.prepend(n),requestAnimationFrame((()=>n.classList.add("fl-show")));const r=n.querySelector(".fl-close");if(r&&r.addEventListener("click",(e=>{e.stopPropagation(),this.removeNotification(n)})),s.timeout>0)this.addTimer(n,s);else{n.classList.add("fl-sticky");const e=n.querySelector(".fl-progress-bar");if(e){const t=document.createElement("span");t.classList.add("fl-progress","fl-sticky-progress"),t.style.width="100%",e.append(t)}}}normalizeTimeout(e){return!1===e||"number"==typeof e&&e<0||null==e?0:Number(e)||0}addTimer(e,{timeout:t,fps:s}){if(t<=0)return;const n=1e3/s;let r,o=0;const i=()=>{o+=n;const s=e.querySelector(".fl-progress-bar");if(s){let e=s.querySelector(".fl-progress");e||(e=document.createElement("span"),e.classList.add("fl-progress"),s.append(e));const n=100*(1-o/t);e.style.width=`${Math.max(0,n)}%`}o>=t&&(clearInterval(r),this.removeNotification(e))};r=window.setInterval(i,n),e.addEventListener("mouseout",(()=>{clearInterval(r),r=window.setInterval(i,n)})),e.addEventListener("mouseover",(()=>clearInterval(r)))}removeNotification(e){e&&(e.classList.remove("fl-show"),e.ontransitionend=()=>{const t=e.parentElement;e.remove(),t&&!t.hasChildNodes()&&t.remove()})}stringToHTML(e){const t=document.createElement("template");return t.innerHTML=e.trim(),t.content.firstElementChild}escapeHtml(e){if(null==e)return"";const t={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;","`":"&#96;","=":"&#61;","/":"&#47;"};return e.replace(/[&<>"'`=/]/g,(e=>t[e]||e))}}const n=new class extends t{constructor(){super(...arguments),this.defaultPlugin="flasher",this.plugins=new Map,this.themes=new Map,this.loadedAssets=new Set}render(t){return e(this,void 0,void 0,(function*(){const e=this.resolveResponse(t);try{yield this.addAssets([{urls:e.styles,nonce:e.context.csp_style_nonce,type:"style"},{urls:e.scripts,nonce:e.context.csp_script_nonce,type:"script"}]),this.renderOptions(e.options),this.renderEnvelopes(e.envelopes)}catch(e){console.error("PHPFlasher: Error rendering notifications",e)}}))}renderEnvelopes(e){if(!(null==e?void 0:e.length))return;const t={};e.forEach((e=>{const s=this.resolvePluginAlias(e.metadata.plugin);t[s]=t[s]||[],t[s].push(e)})),Object.entries(t).forEach((([e,t])=>{try{this.use(e).renderEnvelopes(t)}catch(t){console.error(`PHPFlasher: Error rendering envelopes for plugin "${e}"`,t)}}))}renderOptions(e){e&&Object.entries(e).forEach((([e,t])=>{try{this.use(e).renderOptions(t)}catch(t){console.error(`PHPFlasher: Error applying options for plugin "${e}"`,t)}}))}addPlugin(e,t){if(!e||!t)throw new Error("Both plugin name and instance are required");this.plugins.set(e,t)}addTheme(e,t){if(!e||!t)throw new Error("Both theme name and definition are required");this.themes.set(e,t)}use(e){const t=this.resolvePluginAlias(e);this.resolvePlugin(t);const s=this.plugins.get(t);if(!s)throw new Error(`Unable to resolve "${t}" plugin, did you forget to register it?`);return s}create(e){return this.use(e)}resolveResponse(e){const t=Object.assign({envelopes:[],options:{},scripts:[],styles:[],context:{}},e);return Object.entries(t.options).forEach((([e,s])=>{t.options[e]=this.resolveOptions(s)})),t.context.csp_style_nonce=t.context.csp_style_nonce||"",t.context.csp_script_nonce=t.context.csp_script_nonce||"",t.envelopes.forEach((s=>{s.metadata=s.metadata||{},s.metadata.plugin=this.resolvePluginAlias(s.metadata.plugin),this.addThemeStyles(t,s.metadata.plugin),s.options=this.resolveOptions(s.options),s.context=e.context})),t}resolveOptions(e){if(!e)return{};const t=Object.assign({},e);return Object.entries(t).forEach((([e,s])=>{t[e]=this.resolveFunction(s)})),t}resolveFunction(e){var t,s;if("string"!=typeof e)return e;const n=e.match(/^function\s*(\w*)\s*\(([^)]*)\)\s*\{([\s\S]*)\}$/)||e.match(/^\s*(\(([^)]*)\)|[^=]+)\s*=>\s*([\s\S]+)$/);if(!n)return e;const r=null!==(s=null===(t=n[2])||void 0===t?void 0:t.split(",").map((e=>e.trim())))&&void 0!==s?s:[];let o=n[3].trim();o.startsWith("{")||(o=`{ return ${o}; }`);try{return new Function(...r,o)}catch(t){return console.error("PHPFlasher: Error converting string to function:",t),e}}resolvePlugin(e){if(this.plugins.get(e)||!e.includes("theme."))return;const t=e.replace("theme.",""),n=this.themes.get(t);n&&this.addPlugin(e,new s(n))}resolvePluginAlias(e){return"flasher"===(e=e||this.defaultPlugin)?"theme.flasher":e}addAssets(t){return e(this,void 0,void 0,(function*(){try{const e=t.filter((e=>"style"===e.type)),s=[];for(const{urls:t,nonce:n,type:r}of e)if(null==t?void 0:t.length)for(const e of t)e&&!this.loadedAssets.has(e)&&(s.push(this.loadAsset(e,n,r)),this.loadedAssets.add(e));yield Promise.all(s);const n=t.filter((e=>"script"===e.type));for(const{urls:e,nonce:t,type:s}of n)if(null==e?void 0:e.length)for(const n of e)n&&!this.loadedAssets.has(n)&&(yield this.loadAsset(n,t,s),this.loadedAssets.add(n))}catch(e){console.error("PHPFlasher: Error loading assets",e)}}))}loadAsset(e,t,s){return document.querySelector(`${"style"===s?"link":"script"}[src="${e}"]`)?Promise.resolve():new Promise(((n,r)=>{const o=document.createElement("style"===s?"link":"script");"style"===s?(o.rel="stylesheet",o.href=e):(o.type="text/javascript",o.src=e),t&&o.setAttribute("nonce",t),o.onload=()=>n(),o.onerror=()=>r(new Error(`Failed to load ${e}`)),document.head.appendChild(o)}))}addThemeStyles(e,t){if("flasher"!==t&&!t.includes("theme."))return;const s=t.replace("theme.",""),n=this.themes.get(s);if(!(null==n?void 0:n.styles))return;const r=Array.isArray(n.styles)?n.styles:[n.styles];e.styles=Array.from(new Set([...e.styles,...r]))}};return n.addTheme("flasher",{render:e=>{const{type:t,title:s,message:n}=e,r="error"===t||"warning"===t,o=r?"alert":"status",i=r?"assertive":"polite",l=s||t.charAt(0).toUpperCase()+t.slice(1);return`\n            <div class="fl-flasher fl-${t}" role="${o}" aria-live="${i}" aria-atomic="true">\n                <div class="fl-content">\n                    <div class="fl-icon"></div>\n                    <div>\n                        <strong class="fl-title">${l}</strong>\n                        <span class="fl-message">${n}</span>\n                    </div>\n                    <button class="fl-close" aria-label="Close ${t} message">&times;</button>\n                </div>\n                <span class="fl-progress-bar">\n                    <span class="fl-progress"></span>\n                </span>\n            </div>`}}),"undefined"!=typeof window&&(window.flasher=n),n}));
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).flasher=t()}(this,(function(){"use strict";function e(e,t,s,n){return new(s||(s=Promise))((function(r,o){function i(e){try{a(n.next(e))}catch(e){o(e)}}function l(e){try{a(n.throw(e))}catch(e){o(e)}}function a(e){var t;e.done?r(e.value):(t=e.value,t instanceof s?t:new s((function(e){e(t)}))).then(i,l)}a((n=n.apply(e,t||[])).next())}))}"function"==typeof SuppressedError&&SuppressedError;class t{success(e,t,s){this.flash("success",e,t,s)}error(e,t,s){this.flash("error",e,t,s)}info(e,t,s){this.flash("info",e,t,s)}warning(e,t,s){this.flash("warning",e,t,s)}flash(e,t,s,n){let r,o,i,l={};if("object"==typeof e?(l=Object.assign({},e),r=l.type,o=l.message,i=l.title,delete l.type,delete l.message,delete l.title):"object"==typeof t?(l=Object.assign({},t),r=e,o=l.message,i=l.title,delete l.message,delete 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this.loadAsset(n,t,s),this.loadedAssets.add(n))}catch(e){console.error("PHPFlasher: Error loading assets",e)}}))}loadAsset(e,t,s){return document.querySelector(`${"style"===s?"link":"script"}[src="${e}"]`)?Promise.resolve():new Promise(((n,r)=>{const o=document.createElement("style"===s?"link":"script");"style"===s?(o.rel="stylesheet",o.href=e):(o.type="text/javascript",o.src=e),t&&o.setAttribute("nonce",t),o.onload=()=>n(),o.onerror=()=>r(new Error(`Failed to load ${e}`)),document.head.appendChild(o)}))}addThemeStyles(e,t){if("flasher"!==t&&!t.includes("theme."))return;const s=t.replace("theme.",""),n=this.themes.get(s);if(!(null==n?void 0:n.styles))return;const r=Array.isArray(n.styles)?n.styles:[n.styles];e.styles=Array.from(new Set([...e.styles,...r]))}};return n.addTheme("flasher",{render:e=>{const{type:t,title:s,message:n}=e,r="error"===t||"warning"===t,o=r?"alert":"status",i=r?"assertive":"polite",l=s||t.charAt(0).toUpperCase()+t.slice(1);return`\n            <div class="fl-flasher fl-${t}" role="${o}" aria-live="${i}" aria-atomic="true">\n                <div class="fl-content">\n                    <div class="fl-icon"></div>\n                    <div>\n                        <strong class="fl-title">${l}</strong>\n                        <span class="fl-message">${n}</span>\n                    </div>\n                    <button class="fl-close" aria-label="Close ${t} message">&times;</button>\n                </div>\n                <span class="fl-progress-bar">\n                    <span class="fl-progress"></span>\n                </span>\n            </div>`}}),"undefined"!=typeof window&&(window.flasher=n),n}));
diff --git a/src/Prime/Resources/public/flasher.min.js b/src/Prime/Resources/public/flasher.min.js
index d34b9128..62b72f2d 100644
--- a/src/Prime/Resources/public/flasher.min.js
+++ b/src/Prime/Resources/public/flasher.min.js
@@ -1 +1 @@
-!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).flasher=t()}(this,(function(){"use strict";function e(e,t,s,n){return new(s||(s=Promise))((function(r,o){function i(e){try{a(n.next(e))}catch(e){o(e)}}function l(e){try{a(n.throw(e))}catch(e){o(e)}}function a(e){var t;e.done?r(e.value):(t=e.value,t instanceof s?t:new s((function(e){e(t)}))).then(i,l)}a((n=n.apply(e,t||[])).next())}))}"function"==typeof SuppressedError&&SuppressedError;class t{success(e,t,s){this.flash("success",e,t,s)}error(e,t,s){this.flash("error",e,t,s)}info(e,t,s){this.flash("info",e,t,s)}warning(e,t,s){this.flash("warning",e,t,s)}flash(e,t,s,n){let r,o,i,l={};if("object"==typeof e?(l=Object.assign({},e),r=l.type,o=l.message,i=l.title,delete l.type,delete l.message,delete l.title):"object"==typeof t?(l=Object.assign({},t),r=e,o=l.message,i=l.title,delete l.message,delete 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                 <span class="fl-message">${n}</span>\n                    </div>\n                    <button class="fl-close" aria-label="Close ${t} message">&times;</button>\n                </div>\n                <span class="fl-progress-bar">\n                    <span class="fl-progress"></span>\n                </span>\n            </div>`}}),"undefined"!=typeof window&&(window.flasher=n),n}));
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e="undefined"!=typeof globalThis?globalThis:e||self).flasher=t()}(this,(function(){"use strict";function e(e,t,s,n){return new(s||(s=Promise))((function(r,o){function i(e){try{a(n.next(e))}catch(e){o(e)}}function l(e){try{a(n.throw(e))}catch(e){o(e)}}function a(e){var t;e.done?r(e.value):(t=e.value,t instanceof s?t:new s((function(e){e(t)}))).then(i,l)}a((n=n.apply(e,t||[])).next())}))}"function"==typeof SuppressedError&&SuppressedError;class t{success(e,t,s){this.flash("success",e,t,s)}error(e,t,s){this.flash("error",e,t,s)}info(e,t,s){this.flash("info",e,t,s)}warning(e,t,s){this.flash("warning",e,t,s)}flash(e,t,s,n){let r,o,i,l={};if("object"==typeof e?(l=Object.assign({},e),r=l.type,o=l.message,i=l.title,delete l.type,delete l.message,delete l.title):"object"==typeof t?(l=Object.assign({},t),r=e,o=l.message,i=l.title,delete l.message,delete l.title):(r=e,o=t,null==s?(i=void 0,l=n||{}):"string"==typeof s?(i=s,l=n||{}):"object"==typeof s&&(l=Object.assign({},s),"title"in l?(i=l.title,delete l.title):i=void 0,n&&"object"==typeof n&&(l=Object.assign(Object.assign({},l),n)))),!r)throw new Error("Type is required for notifications");if(null==o)throw new Error("Message is required for notifications");null==i&&(i=r.charAt(0).toUpperCase()+r.slice(1));const a={type:r,message:o,title:i,options:l,metadata:{plugin:""}};this.renderOptions({}),this.renderEnvelopes([a])}}class s extends t{constructor(e){if(super(),this.options={timeout:null,timeouts:{success:1e4,info:1e4,error:1e4,warning:1e4},fps:30,position:"top-right",direction:"top",rtl:!1,style:{},escapeHtml:!1},!e)throw new Error("Theme is required");if("function"!=typeof e.render)throw new TypeError("Theme must have a render function");this.theme=e}renderEnvelopes(e){if(!(null==e?void 0:e.length))return;const t=()=>{e.forEach((e=>{var t,s,n,r;try{const o=null!==(s=null!==(t=this.options.timeout)&&void 0!==t?t:this.options.timeouts[e.type])&&void 0!==s?s:1e4,i=Object.assign(Object.assign(Object.assign({},this.options),e.options),{timeout:this.normalizeTimeout(null!==(n=e.options.timeout)&&void 0!==n?n:o),escapeHtml:null!==(r=e.options.escapeHtml)&&void 0!==r?r:this.options.escapeHtml}),l=this.createContainer(i),a={direction:i.direction,timeout:Number(i.timeout||0),fps:i.fps,rtl:i.rtl,escapeHtml:i.escapeHtml};this.addToContainer(l,e,a)}catch(t){console.error("PHPFlasher: Error rendering envelope",t,e)}}))};"loading"===document.readyState?document.addEventListener("DOMContentLoaded",t):t()}renderOptions(e){e&&(this.options=Object.assign(Object.assign({},this.options),e))}createContainer(e){let t=document.querySelector(`.fl-wrapper[data-position="${e.position}"]`);return t||(t=document.createElement("div"),t.className="fl-wrapper",t.dataset.position=e.position,Object.entries(e.style).forEach((([e,s])=>{if(null!=s){const n=e.replace(/([A-Z])/g,"-$1").toLowerCase();t.style.setProperty(n,String(s))}})),document.body.appendChild(t)),t.dataset.turboTemporary="",t}addToContainer(e,t,s){s.escapeHtml&&(t.title=this.escapeHtml(t.title),t.message=this.escapeHtml(t.message));const n=this.stringToHTML(this.theme.render(t));n.classList.add("fl-container"),s.rtl&&n.classList.add("fl-rtl"),"bottom"===s.direction?e.append(n):e.prepend(n),requestAnimationFrame((()=>n.classList.add("fl-show")));const r=n.querySelector(".fl-close");if(r&&r.addEventListener("click",(e=>{e.stopPropagation(),this.removeNotification(n)})),s.timeout>0)this.addTimer(n,s);else{n.classList.add("fl-sticky");const e=n.querySelector(".fl-progress-bar");if(e){const t=document.createElement("span");t.classList.add("fl-progress","fl-sticky-progress"),t.style.width="100%",e.append(t)}}}normalizeTimeout(e){return!1===e||"number"==typeof e&&e<0||null==e?0:Number(e)||0}addTimer(e,{timeout:t,fps:s}){if(t<=0)return;const n=1e3/s;let r,o=0;const i=()=>{o+=n;const s=e.querySelector(".fl-progress-bar");if(s){let e=s.querySelector(".fl-progress");e||(e=document.createElement("span"),e.classList.add("fl-progress"),s.append(e));const n=100*(1-o/t);e.style.width=`${Math.max(0,n)}%`}o>=t&&(clearInterval(r),this.removeNotification(e))};r=window.setInterval(i,n),e.addEventListener("mouseout",(()=>{clearInterval(r),r=window.setInterval(i,n)})),e.addEventListener("mouseover",(()=>clearInterval(r)))}removeNotification(e){e&&(e.classList.remove("fl-show"),e.ontransitionend=()=>{const t=e.parentElement;e.remove(),t&&!t.hasChildNodes()&&t.remove()})}stringToHTML(e){const t=document.createElement("template");return t.innerHTML=e.trim(),t.content.firstElementChild}escapeHtml(e){if(null==e)return"";const t={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;","`":"&#96;","=":"&#61;","/":"&#47;"};return e.replace(/[&<>"'`=/]/g,(e=>t[e]||e))}}const n=new class extends t{constructor(){super(...arguments),this.defaultPlugin="flasher",this.plugins=new Map,this.themes=new Map,this.loadedAssets=new Set}render(t){return e(this,void 0,void 0,(function*(){const e=this.resolveResponse(t);try{yield this.addAssets([{urls:e.styles,nonce:e.context.csp_style_nonce,type:"style"},{urls:e.scripts,nonce:e.context.csp_script_nonce,type:"script"}]),this.renderOptions(e.options),this.renderEnvelopes(e.envelopes)}catch(e){console.error("PHPFlasher: Error rendering notifications",e)}}))}renderEnvelopes(e){if(!(null==e?void 0:e.length))return;const t={};e.forEach((e=>{const s=this.resolvePluginAlias(e.metadata.plugin);t[s]=t[s]||[],t[s].push(e)})),Object.entries(t).forEach((([e,t])=>{try{this.use(e).renderEnvelopes(t)}catch(t){console.error(`PHPFlasher: Error rendering envelopes for plugin "${e}"`,t)}}))}renderOptions(e){e&&Object.entries(e).forEach((([e,t])=>{try{this.use(e).renderOptions(t)}catch(t){console.error(`PHPFlasher: Error applying options for plugin "${e}"`,t)}}))}addPlugin(e,t){if(!e||!t)throw new Error("Both plugin name and instance are required");this.plugins.set(e,t)}addTheme(e,t){if(!e||!t)throw new Error("Both theme name and definition are required");this.themes.set(e,t)}use(e){const t=this.resolvePluginAlias(e);this.resolvePlugin(t);const s=this.plugins.get(t);if(!s)throw new Error(`Unable to resolve "${t}" plugin, did you forget to register it?`);return s}create(e){return this.use(e)}resolveResponse(e){const t=Object.assign({envelopes:[],options:{},scripts:[],styles:[],context:{}},e);return Object.entries(t.options).forEach((([e,s])=>{t.options[e]=this.resolveOptions(s)})),t.context.csp_style_nonce=t.context.csp_style_nonce||"",t.context.csp_script_nonce=t.context.csp_script_nonce||"",t.envelopes.forEach((e=>{e.metadata=e.metadata||{},e.metadata.plugin=this.resolvePluginAlias(e.metadata.plugin),this.addThemeStyles(t,e.metadata.plugin),e.options=this.resolveOptions(e.options),e.context=t.context})),t}resolveOptions(e){if(!e)return{};const t=Object.assign({},e);return Object.entries(t).forEach((([e,s])=>{t[e]=this.resolveFunction(s)})),t}resolveFunction(e){var t,s,n,r;if("string"!=typeof e)return e;const o=e.match(/^function\s*(\w*)\s*\(([^)]*)\)\s*\{([\s\S]*)\}$/),i=e.match(/^\s*(\(([^)]*)\)|[^=]+)\s*=>\s*([\s\S]+)$/);if(!o&&!i)return e;let l,a;o?(l=null!==(s=null===(t=o[2])||void 0===t?void 0:t.split(",").map((e=>e.trim())).filter(Boolean))&&void 0!==s?s:[],a=o[3].trim()):(l=null!==(r=null===(n=i[2])||void 0===n?void 0:n.split(",").map((e=>e.trim())).filter(Boolean))&&void 0!==r?r:[],a=i[3].trim(),a=a.startsWith("{")?a.slice(1,-1).trim():`return ${a};`);try{return new Function(...l,a)}catch(t){return console.error("PHPFlasher: Error converting string to function:",t),e}}resolvePlugin(e){if(this.plugins.get(e)||!e.includes("theme."))return;const t=e.replace("theme.",""),n=this.themes.get(t);n&&this.addPlugin(e,new s(n))}resolvePluginAlias(e){return"flasher"===(e=e||this.defaultPlugin)?"theme.flasher":e}addAssets(t){return e(this,void 0,void 0,(function*(){try{const e=t.filter((e=>"style"===e.type)),s=[];for(const{urls:t,nonce:n,type:r}of e)if(null==t?void 0:t.length)for(const e of t)e&&!this.loadedAssets.has(e)&&(s.push(this.loadAsset(e,n,r)),this.loadedAssets.add(e));yield Promise.all(s);const n=t.filter((e=>"script"===e.type));for(const{urls:e,nonce:t,type:s}of n)if(null==e?void 0:e.length)for(const n of e)n&&!this.loadedAssets.has(n)&&(yield this.loadAsset(n,t,s),this.loadedAssets.add(n))}catch(e){console.error("PHPFlasher: Error loading assets",e)}}))}loadAsset(e,t,s){return document.querySelector(`${"style"===s?"link":"script"}[src="${e}"]`)?Promise.resolve():new Promise(((n,r)=>{const o=document.createElement("style"===s?"link":"script");"style"===s?(o.rel="stylesheet",o.href=e):(o.type="text/javascript",o.src=e),t&&o.setAttribute("nonce",t),o.onload=()=>n(),o.onerror=()=>r(new Error(`Failed to load ${e}`)),document.head.appendChild(o)}))}addThemeStyles(e,t){if("flasher"!==t&&!t.includes("theme."))return;const s=t.replace("theme.",""),n=this.themes.get(s);if(!(null==n?void 0:n.styles))return;const r=Array.isArray(n.styles)?n.styles:[n.styles];e.styles=Array.from(new Set([...e.styles,...r]))}};return n.addTheme("flasher",{render:e=>{const{type:t,title:s,message:n}=e,r="error"===t||"warning"===t,o=r?"alert":"status",i=r?"assertive":"polite",l=s||t.charAt(0).toUpperCase()+t.slice(1);return`\n            <div class="fl-flasher fl-${t}" role="${o}" aria-live="${i}" aria-atomic="true">\n                <div class="fl-content">\n                    <div class="fl-icon"></div>\n                    <div>\n                        <strong class="fl-title">${l}</strong>\n                        <span class="fl-message">${n}</span>\n                    </div>\n                    <button class="fl-close" aria-label="Close ${t} message">&times;</button>\n                </div>\n                <span class="fl-progress-bar">\n                    <span class="fl-progress"></span>\n                </span>\n            </div>`}}),"undefined"!=typeof window&&(window.flasher=n),n}));
diff --git a/tests/adapters/noty.test.ts b/tests/adapters/noty.test.ts
new file mode 100644
index 00000000..8b48c749
--- /dev/null
+++ b/tests/adapters/noty.test.ts
@@ -0,0 +1,227 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { Envelope } from '@flasher/flasher/types'
+
+// Use vi.hoisted to define mocks that will be available during vi.mock hoisting
+const { mockShow, mockNotyInstance, MockNoty } = vi.hoisted(() => {
+    const mockShow = vi.fn()
+    const mockNotyInstance = {
+        show: mockShow,
+        layoutDom: { dataset: {} as DOMStringMap },
+    }
+    const MockNoty = Object.assign(
+        vi.fn().mockImplementation(() => mockNotyInstance),
+        { overrideDefaults: vi.fn() },
+    )
+    return { mockShow, mockNotyInstance, MockNoty }
+})
+
+vi.mock('noty', () => ({
+    default: MockNoty,
+}))
+
+// Import after mocks
+import NotyPlugin from '@flasher/flasher-noty/noty'
+
+const createEnvelope = (overrides: Partial<Envelope> = {}): Envelope => ({
+    type: 'success',
+    message: 'Test message',
+    title: 'Test title',
+    options: {},
+    metadata: { plugin: 'noty' },
+    ...overrides,
+})
+
+describe('NotyPlugin', () => {
+    let plugin: NotyPlugin
+
+    beforeEach(() => {
+        vi.clearAllMocks()
+        // Restore mock implementations after clearing
+        MockNoty.mockImplementation(() => mockNotyInstance)
+        mockNotyInstance.layoutDom = { dataset: {} as DOMStringMap }
+        plugin = new NotyPlugin()
+    })
+
+    describe('renderEnvelopes', () => {
+        it('should do nothing with empty envelopes', () => {
+            plugin.renderEnvelopes([])
+
+            expect(MockNoty).not.toHaveBeenCalled()
+        })
+
+        it('should do nothing with null/undefined envelopes', () => {
+            plugin.renderEnvelopes(null as unknown as Envelope[])
+            plugin.renderEnvelopes(undefined as unknown as Envelope[])
+
+            expect(MockNoty).not.toHaveBeenCalled()
+        })
+
+        it('should create Noty instance with envelope data', () => {
+            plugin.renderEnvelopes([createEnvelope({
+                type: 'success',
+                message: 'Hello World',
+            })])
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                text: 'Hello World',
+                type: 'success',
+            }))
+        })
+
+        it('should call show() on Noty instance', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(mockShow).toHaveBeenCalled()
+        })
+
+        it('should include default timeout option', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                timeout: 10000,
+            }))
+        })
+
+        it('should merge envelope options', () => {
+            plugin.renderEnvelopes([createEnvelope({
+                options: { timeout: 5000, layout: 'topRight' },
+            })])
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                timeout: 5000,
+                layout: 'topRight',
+            }))
+        })
+
+        it('should render multiple envelopes', () => {
+            plugin.renderEnvelopes([
+                createEnvelope({ message: 'First' }),
+                createEnvelope({ message: 'Second' }),
+            ])
+
+            expect(MockNoty).toHaveBeenCalledTimes(2)
+            expect(mockShow).toHaveBeenCalledTimes(2)
+        })
+
+        it('should set Turbo compatibility on layoutDom', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(mockNotyInstance.layoutDom.dataset.turboTemporary).toBe('')
+        })
+
+        it('should handle missing layoutDom gracefully', () => {
+            MockNoty.mockImplementationOnce(() => ({
+                show: mockShow,
+                layoutDom: null,
+            }))
+
+            // Should not throw
+            expect(() => plugin.renderEnvelopes([createEnvelope()])).not.toThrow()
+        })
+
+        it('should handle errors gracefully', () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            MockNoty.mockImplementationOnce(() => {
+                throw new Error('Noty error')
+            })
+
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error rendering notification'),
+                expect.any(Error),
+                expect.any(Object),
+            )
+        })
+    })
+
+    describe('renderOptions', () => {
+        it('should do nothing with null/undefined options', () => {
+            plugin.renderOptions(null as unknown as Record<string, unknown>)
+            plugin.renderOptions(undefined as unknown as Record<string, unknown>)
+
+            expect(MockNoty.overrideDefaults).not.toHaveBeenCalled()
+        })
+
+        it('should call Noty.overrideDefaults with merged options', () => {
+            plugin.renderOptions({ timeout: 8000, layout: 'bottomLeft' })
+
+            expect(MockNoty.overrideDefaults).toHaveBeenCalledWith(expect.objectContaining({
+                timeout: 8000,
+                layout: 'bottomLeft',
+            }))
+        })
+
+        it('should preserve existing default options', () => {
+            plugin.renderOptions({ layout: 'topLeft' })
+            plugin.renderOptions({ theme: 'mint' })
+
+            // Get the last call arguments
+            const lastCall = MockNoty.overrideDefaults.mock.calls[MockNoty.overrideDefaults.mock.calls.length - 1][0]
+
+            expect(lastCall).toMatchObject({
+                timeout: 10000, // default
+                layout: 'topLeft', // from first call
+                theme: 'mint', // from second call
+            })
+        })
+
+        it('should use options in subsequent renderEnvelopes', () => {
+            plugin.renderOptions({ animation: { open: 'fadeIn', close: 'fadeOut' } })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                animation: { open: 'fadeIn', close: 'fadeOut' },
+            }))
+        })
+    })
+
+    describe('convenience methods (inherited from AbstractPlugin)', () => {
+        it('success() should create success notification', () => {
+            plugin.success('Success message')
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'success',
+            }))
+        })
+
+        it('error() should create error notification', () => {
+            plugin.error('Error message')
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'error',
+            }))
+        })
+
+        it('info() should create info notification', () => {
+            plugin.info('Info message')
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'info',
+            }))
+        })
+
+        it('warning() should create warning notification', () => {
+            plugin.warning('Warning message')
+
+            expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'warning',
+            }))
+        })
+    })
+
+    describe('notification types', () => {
+        it('should support all standard Noty types', () => {
+            const types = ['alert', 'success', 'error', 'warning', 'info']
+
+            types.forEach((type) => {
+                MockNoty.mockClear()
+                plugin.renderEnvelopes([createEnvelope({ type })])
+
+                expect(MockNoty).toHaveBeenCalledWith(expect.objectContaining({
+                    type,
+                }))
+            })
+        })
+    })
+})
diff --git a/tests/adapters/notyf.test.ts b/tests/adapters/notyf.test.ts
new file mode 100644
index 00000000..f90f6275
--- /dev/null
+++ b/tests/adapters/notyf.test.ts
@@ -0,0 +1,218 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { Envelope } from '@flasher/flasher/types'
+
+// Use vi.hoisted to define mocks that will be available during vi.mock hoisting
+const { mockOpen, mockNotyfInstance, MockNotyf } = vi.hoisted(() => {
+    const mockOpen = vi.fn()
+    const mockNotyfInstance = {
+        open: mockOpen,
+        view: {
+            container: { dataset: {} as DOMStringMap },
+            a11yContainer: { dataset: {} as DOMStringMap },
+        },
+    }
+    const MockNotyf = vi.fn().mockImplementation(() => mockNotyfInstance)
+    return { mockOpen, mockNotyfInstance, MockNotyf }
+})
+
+vi.mock('notyf', () => ({
+    Notyf: MockNotyf,
+}))
+
+vi.mock('notyf/notyf.min.css', () => ({}))
+
+// Import after mocks
+import NotyfPlugin from '@flasher/flasher-notyf/notyf'
+
+const createEnvelope = (overrides: Partial<Envelope> = {}): Envelope => ({
+    type: 'success',
+    message: 'Test message',
+    title: 'Test title',
+    options: {},
+    metadata: { plugin: 'notyf' },
+    ...overrides,
+})
+
+describe('NotyfPlugin', () => {
+    let plugin: NotyfPlugin
+
+    beforeEach(() => {
+        vi.clearAllMocks()
+        // Restore mock implementations after clearing
+        MockNotyf.mockImplementation(() => mockNotyfInstance)
+        mockNotyfInstance.view.container.dataset = {} as DOMStringMap
+        mockNotyfInstance.view.a11yContainer.dataset = {} as DOMStringMap
+        plugin = new NotyfPlugin()
+    })
+
+    describe('renderEnvelopes', () => {
+        it('should initialize Notyf on first render', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(MockNotyf).toHaveBeenCalled()
+        })
+
+        it('should call notyf.open with envelope data', () => {
+            plugin.renderEnvelopes([createEnvelope({
+                type: 'success',
+                message: 'Hello',
+                title: 'Title',
+            })])
+
+            expect(mockOpen).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'success',
+                message: 'Hello',
+                title: 'Title',
+            }))
+        })
+
+        it('should merge envelope options', () => {
+            plugin.renderEnvelopes([createEnvelope({
+                options: { duration: 5000, dismissible: true },
+            })])
+
+            expect(mockOpen).toHaveBeenCalledWith(expect.objectContaining({
+                duration: 5000,
+                dismissible: true,
+            }))
+        })
+
+        it('should render multiple envelopes', () => {
+            plugin.renderEnvelopes([
+                createEnvelope({ message: 'First' }),
+                createEnvelope({ message: 'Second' }),
+            ])
+
+            expect(mockOpen).toHaveBeenCalledTimes(2)
+        })
+
+        it('should set Turbo compatibility on containers', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(mockNotyfInstance.view.container.dataset.turboTemporary).toBe('')
+            expect(mockNotyfInstance.view.a11yContainer.dataset.turboTemporary).toBe('')
+        })
+
+        it('should handle errors gracefully', () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            mockOpen.mockImplementationOnce(() => {
+                throw new Error('Notyf error')
+            })
+
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error rendering notification'),
+                expect.any(Error),
+                expect.any(Object),
+            )
+        })
+    })
+
+    describe('renderOptions', () => {
+        it('should do nothing with null/undefined options', () => {
+            plugin.renderOptions(null as unknown as Record<string, unknown>)
+            plugin.renderOptions(undefined as unknown as Record<string, unknown>)
+            // Should not throw
+        })
+
+        it('should initialize Notyf with options', () => {
+            plugin.renderOptions({ duration: 8000, position: { x: 'left', y: 'bottom' } })
+
+            expect(MockNotyf).toHaveBeenCalledWith(expect.objectContaining({
+                duration: 8000,
+                position: { x: 'left', y: 'bottom' },
+            }))
+        })
+
+        it('should use default duration if not provided', () => {
+            plugin.renderOptions({ position: { x: 'center', y: 'top' } })
+
+            expect(MockNotyf).toHaveBeenCalledWith(expect.objectContaining({
+                duration: 10000,
+            }))
+        })
+
+        it('should add info type configuration', () => {
+            plugin.renderOptions({})
+
+            const callArgs = MockNotyf.mock.calls[0][0]
+            const infoType = callArgs.types.find((t: any) => t.type === 'info')
+
+            expect(infoType).toBeDefined()
+            expect(infoType.className).toBe('notyf__toast--info')
+            expect(infoType.background).toBe('#5784E5')
+        })
+
+        it('should add warning type configuration', () => {
+            plugin.renderOptions({})
+
+            const callArgs = MockNotyf.mock.calls[0][0]
+            const warningType = callArgs.types.find((t: any) => t.type === 'warning')
+
+            expect(warningType).toBeDefined()
+            expect(warningType.className).toBe('notyf__toast--warning')
+            expect(warningType.background).toBe('#E3A008')
+        })
+
+        it('should not duplicate types if already provided', () => {
+            plugin.renderOptions({
+                types: [
+                    { type: 'info', background: '#custom' },
+                ],
+            })
+
+            const callArgs = MockNotyf.mock.calls[0][0]
+            const infoTypes = callArgs.types.filter((t: any) => t.type === 'info')
+
+            expect(infoTypes).toHaveLength(1)
+            expect(infoTypes[0].background).toBe('#custom')
+        })
+    })
+
+    describe('default initialization', () => {
+        it('should initialize with default options when rendering without prior options', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(MockNotyf).toHaveBeenCalledWith(expect.objectContaining({
+                duration: 10000,
+                position: { x: 'right', y: 'top' },
+                dismissible: true,
+            }))
+        })
+    })
+
+    describe('convenience methods (inherited from AbstractPlugin)', () => {
+        it('success() should create success notification', () => {
+            plugin.success('Success message')
+
+            expect(mockOpen).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'success',
+            }))
+        })
+
+        it('error() should create error notification', () => {
+            plugin.error('Error message')
+
+            expect(mockOpen).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'error',
+            }))
+        })
+
+        it('info() should create info notification', () => {
+            plugin.info('Info message')
+
+            expect(mockOpen).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'info',
+            }))
+        })
+
+        it('warning() should create warning notification', () => {
+            plugin.warning('Warning message')
+
+            expect(mockOpen).toHaveBeenCalledWith(expect.objectContaining({
+                type: 'warning',
+            }))
+        })
+    })
+})
diff --git a/tests/adapters/sweetalert.test.ts b/tests/adapters/sweetalert.test.ts
new file mode 100644
index 00000000..30eb8761
--- /dev/null
+++ b/tests/adapters/sweetalert.test.ts
@@ -0,0 +1,271 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { Envelope } from '@flasher/flasher/types'
+
+// Use vi.hoisted to define mocks that will be available during vi.mock hoisting
+const { mockFire, mockMixin, mockIsVisible, mockGetPopup, mockClose } = vi.hoisted(() => {
+    const mockFire = vi.fn().mockResolvedValue({ isConfirmed: true })
+    const mockMixin = vi.fn().mockReturnValue({ fire: mockFire })
+    const mockIsVisible = vi.fn().mockReturnValue(false)
+    const mockGetPopup = vi.fn().mockReturnValue({ style: { setProperty: vi.fn() } })
+    const mockClose = vi.fn()
+    return { mockFire, mockMixin, mockIsVisible, mockGetPopup, mockClose }
+})
+
+vi.mock('sweetalert2', () => ({
+    default: {
+        mixin: mockMixin,
+        isVisible: mockIsVisible,
+        getPopup: mockGetPopup,
+        close: mockClose,
+    },
+}))
+
+// Import after mocks
+import SweetAlertPlugin from '@flasher/flasher-sweetalert/sweetalert'
+
+const createEnvelope = (overrides: Partial<Envelope> = {}): Envelope => ({
+    type: 'success',
+    message: 'Test message',
+    title: 'Test title',
+    options: {},
+    metadata: { plugin: 'sweetalert' },
+    ...overrides,
+})
+
+describe('SweetAlertPlugin', () => {
+    let plugin: SweetAlertPlugin
+
+    beforeEach(() => {
+        vi.clearAllMocks()
+        // Restore mock implementations after clearing
+        mockFire.mockResolvedValue({ isConfirmed: true })
+        mockMixin.mockReturnValue({ fire: mockFire })
+        mockIsVisible.mockReturnValue(false)
+        mockGetPopup.mockReturnValue({ style: { setProperty: vi.fn() } })
+        plugin = new SweetAlertPlugin()
+    })
+
+    describe('renderEnvelopes', () => {
+        it('should initialize SweetAlert on first render', async () => {
+            await plugin.renderEnvelopes([createEnvelope()])
+
+            expect(mockMixin).toHaveBeenCalled()
+        })
+
+        it('should call fire with envelope options', async () => {
+            await plugin.renderEnvelopes([createEnvelope({
+                type: 'success',
+                message: 'Hello World',
+            })])
+
+            expect(mockFire).toHaveBeenCalledWith(expect.objectContaining({
+                icon: 'success',
+                text: 'Hello World',
+            }))
+        })
+
+        it('should use envelope.type as icon by default', async () => {
+            await plugin.renderEnvelopes([createEnvelope({ type: 'error' })])
+
+            expect(mockFire).toHaveBeenCalledWith(expect.objectContaining({
+                icon: 'error',
+            }))
+        })
+
+        it('should use envelope.message as text by default', async () => {
+            await plugin.renderEnvelopes([createEnvelope({ message: 'Custom message' })])
+
+            expect(mockFire).toHaveBeenCalledWith(expect.objectContaining({
+                text: 'Custom message',
+            }))
+        })
+
+        it('should allow overriding icon via options', async () => {
+            await plugin.renderEnvelopes([createEnvelope({
+                type: 'success',
+                options: { icon: 'warning' },
+            })])
+
+            expect(mockFire).toHaveBeenCalledWith(expect.objectContaining({
+                icon: 'warning',
+            }))
+        })
+
+        it('should allow overriding text via options', async () => {
+            await plugin.renderEnvelopes([createEnvelope({
+                message: 'Original',
+                options: { text: 'Override' },
+            })])
+
+            expect(mockFire).toHaveBeenCalledWith(expect.objectContaining({
+                text: 'Override',
+            }))
+        })
+
+        it('should render envelopes sequentially', async () => {
+            const callOrder: string[] = []
+
+            mockFire
+                .mockImplementationOnce(async () => {
+                    callOrder.push('first')
+                    return { isConfirmed: true }
+                })
+                .mockImplementationOnce(async () => {
+                    callOrder.push('second')
+                    return { isConfirmed: true }
+                })
+
+            await plugin.renderEnvelopes([
+                createEnvelope({ message: 'First' }),
+                createEnvelope({ message: 'Second' }),
+            ])
+
+            expect(callOrder).toEqual(['first', 'second'])
+        })
+
+        it('should dispatch promise event after fire', async () => {
+            const eventHandler = vi.fn()
+            window.addEventListener('flasher:sweetalert:promise', eventHandler)
+
+            await plugin.renderEnvelopes([createEnvelope()])
+
+            expect(eventHandler).toHaveBeenCalledWith(expect.objectContaining({
+                detail: expect.objectContaining({
+                    promise: { isConfirmed: true },
+                    envelope: expect.any(Object),
+                }),
+            }))
+
+            window.removeEventListener('flasher:sweetalert:promise', eventHandler)
+        })
+
+        it('should handle errors gracefully', async () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            mockFire.mockRejectedValueOnce(new Error('Swal error'))
+
+            await plugin.renderEnvelopes([createEnvelope()])
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error rendering envelope'),
+                expect.any(Error),
+                expect.any(Object),
+            )
+        })
+    })
+
+    describe('renderOptions', () => {
+        it('should create mixin with options', () => {
+            plugin.renderOptions({ timer: 5000, showConfirmButton: false })
+
+            expect(mockMixin).toHaveBeenCalledWith(expect.objectContaining({
+                timer: 5000,
+                showConfirmButton: false,
+            }))
+        })
+
+        it('should use default timer if not provided', () => {
+            plugin.renderOptions({})
+
+            expect(mockMixin).toHaveBeenCalledWith(expect.objectContaining({
+                timer: 10000,
+            }))
+        })
+
+        it('should use default timerProgressBar if not provided', () => {
+            plugin.renderOptions({})
+
+            expect(mockMixin).toHaveBeenCalledWith(expect.objectContaining({
+                timerProgressBar: true,
+            }))
+        })
+
+        it('should setup Turbo compatibility', () => {
+            const addEventListenerSpy = vi.spyOn(document, 'addEventListener')
+
+            plugin.renderOptions({})
+
+            expect(addEventListenerSpy).toHaveBeenCalledWith(
+                'turbo:before-cache',
+                expect.any(Function),
+            )
+        })
+
+        it('should handle errors gracefully', () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            mockMixin.mockImplementationOnce(() => {
+                throw new Error('Mixin error')
+            })
+
+            plugin.renderOptions({ timer: 5000 })
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error applying options'),
+                expect.any(Error),
+            )
+        })
+    })
+
+    describe('Turbo compatibility', () => {
+        it('should close visible Swal on turbo:before-cache', () => {
+            mockIsVisible.mockReturnValueOnce(true)
+
+            plugin.renderOptions({})
+
+            // Simulate turbo:before-cache event
+            document.dispatchEvent(new Event('turbo:before-cache'))
+
+            expect(mockClose).toHaveBeenCalled()
+        })
+
+        it('should set animation duration to 0ms before closing', () => {
+            mockIsVisible.mockReturnValueOnce(true)
+            const mockSetProperty = vi.fn()
+            mockGetPopup.mockReturnValueOnce({ style: { setProperty: mockSetProperty } })
+
+            plugin.renderOptions({})
+
+            document.dispatchEvent(new Event('turbo:before-cache'))
+
+            expect(mockSetProperty).toHaveBeenCalledWith('animation-duration', '0ms')
+        })
+
+        it('should not close if Swal is not visible', () => {
+            mockIsVisible.mockReturnValueOnce(false)
+
+            plugin.renderOptions({})
+
+            document.dispatchEvent(new Event('turbo:before-cache'))
+
+            expect(mockClose).not.toHaveBeenCalled()
+        })
+    })
+
+    describe('default initialization', () => {
+        it('should initialize with default options when rendering without prior options', async () => {
+            await plugin.renderEnvelopes([createEnvelope()])
+
+            expect(mockMixin).toHaveBeenCalledWith(expect.objectContaining({
+                timer: 10000,
+                timerProgressBar: true,
+            }))
+        })
+    })
+
+    describe('convenience methods (inherited from AbstractPlugin)', () => {
+        it('success() should create success notification', async () => {
+            await plugin.success('Success message')
+
+            expect(mockFire).toHaveBeenCalledWith(expect.objectContaining({
+                icon: 'success',
+            }))
+        })
+
+        it('error() should create error notification', async () => {
+            await plugin.error('Error message')
+
+            expect(mockFire).toHaveBeenCalledWith(expect.objectContaining({
+                icon: 'error',
+            }))
+        })
+    })
+})
diff --git a/tests/adapters/toastr.test.ts b/tests/adapters/toastr.test.ts
new file mode 100644
index 00000000..7bf34828
--- /dev/null
+++ b/tests/adapters/toastr.test.ts
@@ -0,0 +1,221 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { Envelope } from '@flasher/flasher/types'
+
+// Use vi.hoisted to define mocks that will be available during vi.mock hoisting
+const { mockToastr, mockJQuery } = vi.hoisted(() => {
+    const mockToastr = {
+        success: vi.fn().mockReturnValue({ parent: vi.fn().mockReturnValue({ attr: vi.fn() }) }),
+        error: vi.fn().mockReturnValue({ parent: vi.fn().mockReturnValue({ attr: vi.fn() }) }),
+        info: vi.fn().mockReturnValue({ parent: vi.fn().mockReturnValue({ attr: vi.fn() }) }),
+        warning: vi.fn().mockReturnValue({ parent: vi.fn().mockReturnValue({ attr: vi.fn() }) }),
+        options: {} as Record<string, unknown>,
+    }
+    const mockJQuery = vi.fn()
+    return { mockToastr, mockJQuery }
+})
+
+vi.mock('toastr', () => ({
+    default: mockToastr,
+}))
+
+// Import after mocks are set up
+import ToastrPlugin from '@flasher/flasher-toastr/toastr'
+
+const createEnvelope = (overrides: Partial<Envelope> = {}): Envelope => ({
+    type: 'success',
+    message: 'Test message',
+    title: 'Test title',
+    options: {},
+    metadata: { plugin: 'toastr' },
+    ...overrides,
+})
+
+describe('ToastrPlugin', () => {
+    let plugin: ToastrPlugin
+
+    beforeEach(() => {
+        plugin = new ToastrPlugin()
+        vi.clearAllMocks()
+        mockToastr.options = {}
+
+        // Set up jQuery mock
+        ;(window as any).jQuery = mockJQuery
+        ;(window as any).$ = mockJQuery
+    })
+
+    describe('renderEnvelopes', () => {
+        it('should do nothing with empty envelopes', () => {
+            plugin.renderEnvelopes([])
+
+            expect(mockToastr.success).not.toHaveBeenCalled()
+        })
+
+        it('should do nothing with null/undefined envelopes', () => {
+            plugin.renderEnvelopes(null as unknown as Envelope[])
+            plugin.renderEnvelopes(undefined as unknown as Envelope[])
+
+            expect(mockToastr.success).not.toHaveBeenCalled()
+        })
+
+        it('should call toastr with correct type', () => {
+            plugin.renderEnvelopes([createEnvelope({ type: 'success' })])
+            expect(mockToastr.success).toHaveBeenCalled()
+
+            plugin.renderEnvelopes([createEnvelope({ type: 'error' })])
+            expect(mockToastr.error).toHaveBeenCalled()
+
+            plugin.renderEnvelopes([createEnvelope({ type: 'info' })])
+            expect(mockToastr.info).toHaveBeenCalled()
+
+            plugin.renderEnvelopes([createEnvelope({ type: 'warning' })])
+            expect(mockToastr.warning).toHaveBeenCalled()
+        })
+
+        it('should pass message, title, and options to toastr', () => {
+            plugin.renderEnvelopes([createEnvelope({
+                message: 'Hello World',
+                title: 'Greeting',
+                options: { timeOut: 5000 },
+            })])
+
+            expect(mockToastr.success).toHaveBeenCalledWith(
+                'Hello World',
+                'Greeting',
+                { timeOut: 5000 },
+            )
+        })
+
+        it('should render multiple envelopes', () => {
+            plugin.renderEnvelopes([
+                createEnvelope({ type: 'success', message: 'First' }),
+                createEnvelope({ type: 'error', message: 'Second' }),
+            ])
+
+            expect(mockToastr.success).toHaveBeenCalledTimes(1)
+            expect(mockToastr.error).toHaveBeenCalledTimes(1)
+        })
+
+        it('should set Turbo compatibility attribute', () => {
+            const mockParent = { attr: vi.fn() }
+            mockToastr.success.mockReturnValue({ parent: () => mockParent })
+
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(mockParent.attr).toHaveBeenCalledWith('data-turbo-temporary', '')
+        })
+
+        it('should log error when jQuery is not available', () => {
+            delete (window as any).jQuery
+            delete (window as any).$
+
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('jQuery is required'),
+            )
+            expect(mockToastr.success).not.toHaveBeenCalled()
+
+            // Restore jQuery for other tests
+            ;(window as any).jQuery = mockJQuery
+            ;(window as any).$ = mockJQuery
+        })
+
+        it('should handle toastr errors gracefully', () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            mockToastr.success.mockImplementationOnce(() => {
+                throw new Error('Toastr error')
+            })
+
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error rendering notification'),
+                expect.any(Error),
+                expect.any(Object),
+            )
+        })
+
+        it('should handle missing parent method gracefully', () => {
+            mockToastr.success.mockReturnValueOnce({})
+
+            // Should not throw
+            expect(() => plugin.renderEnvelopes([createEnvelope()])).not.toThrow()
+        })
+
+        it('should handle parent() returning null gracefully', () => {
+            mockToastr.success.mockReturnValueOnce({ parent: () => null })
+
+            // Should not throw
+            expect(() => plugin.renderEnvelopes([createEnvelope()])).not.toThrow()
+        })
+    })
+
+    describe('renderOptions', () => {
+        it('should set toastr options with defaults', () => {
+            plugin.renderOptions({ closeButton: true })
+
+            expect(mockToastr.options).toMatchObject({
+                timeOut: 10000,
+                progressBar: true,
+                closeButton: true,
+            })
+        })
+
+        it('should override default timeOut', () => {
+            plugin.renderOptions({ timeOut: 5000 })
+
+            expect(mockToastr.options.timeOut).toBe(5000)
+        })
+
+        it('should override default progressBar', () => {
+            plugin.renderOptions({ progressBar: false })
+
+            expect(mockToastr.options.progressBar).toBe(false)
+        })
+
+        it('should log error when jQuery is not available', () => {
+            delete (window as any).jQuery
+            delete (window as any).$
+
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+
+            plugin.renderOptions({ timeOut: 5000 })
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('jQuery is required'),
+            )
+
+            // Restore jQuery
+            ;(window as any).jQuery = mockJQuery
+            ;(window as any).$ = mockJQuery
+        })
+    })
+
+    describe('convenience methods (inherited from AbstractPlugin)', () => {
+        it('success() should create success notification', () => {
+            plugin.success('Success message')
+
+            expect(mockToastr.success).toHaveBeenCalled()
+        })
+
+        it('error() should create error notification', () => {
+            plugin.error('Error message')
+
+            expect(mockToastr.error).toHaveBeenCalled()
+        })
+
+        it('info() should create info notification', () => {
+            plugin.info('Info message')
+
+            expect(mockToastr.info).toHaveBeenCalled()
+        })
+
+        it('warning() should create warning notification', () => {
+            plugin.warning('Warning message')
+
+            expect(mockToastr.warning).toHaveBeenCalled()
+        })
+    })
+})
diff --git a/tests/flasher-plugin.test.ts b/tests/flasher-plugin.test.ts
new file mode 100644
index 00000000..245c4503
--- /dev/null
+++ b/tests/flasher-plugin.test.ts
@@ -0,0 +1,491 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import FlasherPlugin from '@flasher/flasher/flasher-plugin'
+import type { Envelope, Theme } from '@flasher/flasher/types'
+
+// Mock SCSS import
+vi.mock('@flasher/flasher/themes/index.scss', () => ({}))
+
+const createMockTheme = (customRender?: (envelope: Envelope) => string): Theme => ({
+    render: customRender || ((envelope: Envelope) => `
+        <div class="fl-notification fl-${envelope.type}">
+            <div class="fl-content">
+                <strong class="fl-title">${envelope.title}</strong>
+                <span class="fl-message">${envelope.message}</span>
+                <button class="fl-close">&times;</button>
+            </div>
+            <span class="fl-progress-bar"></span>
+        </div>
+    `),
+})
+
+const createEnvelope = (overrides: Partial<Envelope> = {}): Envelope => ({
+    type: 'success',
+    message: 'Test message',
+    title: 'Test title',
+    options: {},
+    metadata: { plugin: 'theme.test' },
+    ...overrides,
+})
+
+describe('FlasherPlugin', () => {
+    let plugin: FlasherPlugin
+
+    beforeEach(() => {
+        plugin = new FlasherPlugin(createMockTheme())
+        vi.useFakeTimers()
+
+        // Mock requestAnimationFrame to execute callback immediately
+        vi.spyOn(window, 'requestAnimationFrame').mockImplementation((cb) => {
+            cb(performance.now())
+            return 0
+        })
+    })
+
+    afterEach(() => {
+        vi.useRealTimers()
+    })
+
+    describe('constructor', () => {
+        it('should throw error when theme is missing', () => {
+            expect(() => new FlasherPlugin(null as unknown as Theme)).toThrow('Theme is required')
+        })
+
+        it('should throw error when theme has no render function', () => {
+            expect(() => new FlasherPlugin({} as Theme)).toThrow('Theme must have a render function')
+        })
+
+        it('should throw error when theme render is not a function', () => {
+            expect(() => new FlasherPlugin({ render: 'not a function' } as unknown as Theme)).toThrow('Theme must have a render function')
+        })
+
+        it('should create plugin with valid theme', () => {
+            const p = new FlasherPlugin(createMockTheme())
+            expect(p).toBeInstanceOf(FlasherPlugin)
+        })
+    })
+
+    describe('renderOptions', () => {
+        it('should merge options with defaults', () => {
+            plugin.renderOptions({ timeout: 5000, position: 'bottom-left' })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const container = document.querySelector('.fl-wrapper')
+            expect(container?.getAttribute('data-position')).toBe('bottom-left')
+        })
+
+        it('should do nothing with null/undefined options', () => {
+            plugin.renderOptions(null as unknown as Record<string, unknown>)
+            plugin.renderOptions(undefined as unknown as Record<string, unknown>)
+            // Should not throw
+        })
+    })
+
+    describe('renderEnvelopes', () => {
+        it('should do nothing with empty envelopes', () => {
+            plugin.renderEnvelopes([])
+            expect(document.querySelector('.fl-wrapper')).toBeNull()
+        })
+
+        it('should do nothing with null/undefined envelopes', () => {
+            plugin.renderEnvelopes(null as unknown as Envelope[])
+            plugin.renderEnvelopes(undefined as unknown as Envelope[])
+            // Should not throw
+        })
+
+        it('should create container with default position', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const container = document.querySelector('.fl-wrapper')
+            expect(container).toBeTruthy()
+            expect(container?.getAttribute('data-position')).toBe('top-right')
+        })
+
+        it('should create notification inside container', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const notification = document.querySelector('.fl-container')
+            expect(notification).toBeTruthy()
+        })
+
+        it('should add fl-show class after animation frame', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const notification = document.querySelector('.fl-container')
+            // With mocked requestAnimationFrame, fl-show is added immediately
+            expect(notification?.classList.contains('fl-show')).toBe(true)
+        })
+
+        it('should reuse existing container for same position', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const containers = document.querySelectorAll('.fl-wrapper')
+            expect(containers).toHaveLength(1)
+
+            const notifications = document.querySelectorAll('.fl-container')
+            expect(notifications).toHaveLength(2)
+        })
+
+        it('should create separate containers for different positions', () => {
+            plugin.renderEnvelopes([createEnvelope({ options: { position: 'top-left' } })])
+            plugin.renderEnvelopes([createEnvelope({ options: { position: 'bottom-right' } })])
+
+            const containers = document.querySelectorAll('.fl-wrapper')
+            expect(containers).toHaveLength(2)
+        })
+
+        it('should prepend notifications when direction is "top"', () => {
+            plugin.renderOptions({ direction: 'top' })
+
+            plugin.renderEnvelopes([createEnvelope({ message: 'First' })])
+            plugin.renderEnvelopes([createEnvelope({ message: 'Second' })])
+
+            const container = document.querySelector('.fl-wrapper')
+            const first = container?.firstElementChild
+            expect(first?.querySelector('.fl-message')?.textContent).toBe('Second')
+        })
+
+        it('should append notifications when direction is "bottom"', () => {
+            plugin.renderOptions({ direction: 'bottom' })
+
+            plugin.renderEnvelopes([createEnvelope({ message: 'First' })])
+            plugin.renderEnvelopes([createEnvelope({ message: 'Second' })])
+
+            const container = document.querySelector('.fl-wrapper')
+            const last = container?.lastElementChild
+            expect(last?.querySelector('.fl-message')?.textContent).toBe('Second')
+        })
+
+        it('should add fl-rtl class when rtl option is true', () => {
+            plugin.renderOptions({ rtl: true })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const notification = document.querySelector('.fl-container')
+            expect(notification?.classList.contains('fl-rtl')).toBe(true)
+        })
+
+        it('should set Turbo temporary attribute on container', () => {
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const container = document.querySelector('.fl-wrapper')
+            expect(container?.hasAttribute('data-turbo-temporary')).toBe(true)
+        })
+    })
+
+    describe('timeout and timer', () => {
+        it('should auto-remove notification after timeout', () => {
+            plugin.renderOptions({ timeout: 5000 })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(document.querySelector('.fl-container')).toBeTruthy()
+
+            vi.advanceTimersByTime(5000)
+
+            const notification = document.querySelector('.fl-container')
+            expect(notification?.classList.contains('fl-show')).toBe(false)
+        })
+
+        it('should use type-specific timeout when global timeout is null', () => {
+            plugin.renderOptions({
+                timeout: null,
+                timeouts: { success: 3000 },
+            })
+            plugin.renderEnvelopes([createEnvelope({ type: 'success' })])
+
+            // fl-show is added immediately with mocked requestAnimationFrame
+            const notification = document.querySelector('.fl-container') as HTMLElement
+            expect(notification).toBeTruthy()
+            expect(notification.classList.contains('fl-show')).toBe(true)
+
+            // Advance most of the way (with buffer for timer precision)
+            vi.advanceTimersByTime(2800)
+            expect(notification.classList.contains('fl-show')).toBe(true)
+
+            // Advance past the timeout
+            vi.advanceTimersByTime(300)
+            expect(notification.classList.contains('fl-show')).toBe(false)
+        })
+
+        it('should respect envelope-specific timeout over global', () => {
+            plugin.renderOptions({ timeout: 10000 })
+            plugin.renderEnvelopes([createEnvelope({ options: { timeout: 2000 } })])
+
+            // fl-show is added immediately with mocked requestAnimationFrame
+            const notification = document.querySelector('.fl-container') as HTMLElement
+            expect(notification).toBeTruthy()
+            expect(notification.classList.contains('fl-show')).toBe(true)
+
+            // Should still be showing before timeout
+            vi.advanceTimersByTime(1800)
+            expect(notification.classList.contains('fl-show')).toBe(true)
+
+            // Should be removed after timeout
+            vi.advanceTimersByTime(300)
+            expect(notification.classList.contains('fl-show')).toBe(false)
+        })
+
+        it('should create sticky notification when timeout is false', () => {
+            plugin.renderEnvelopes([createEnvelope({ options: { timeout: false } })])
+
+            const notification = document.querySelector('.fl-container')
+            expect(notification?.classList.contains('fl-sticky')).toBe(true)
+
+            // Should not auto-remove
+            vi.advanceTimersByTime(60000)
+            expect(document.querySelector('.fl-container')).toBeTruthy()
+        })
+
+        it('should create sticky notification when timeout is 0', () => {
+            plugin.renderEnvelopes([createEnvelope({ options: { timeout: 0 } })])
+
+            const notification = document.querySelector('.fl-container')
+            expect(notification?.classList.contains('fl-sticky')).toBe(true)
+        })
+
+        it('should create sticky notification when timeout is negative', () => {
+            plugin.renderEnvelopes([createEnvelope({ options: { timeout: -1 } })])
+
+            const notification = document.querySelector('.fl-container')
+            expect(notification?.classList.contains('fl-sticky')).toBe(true)
+        })
+
+        it('should update progress bar during countdown', () => {
+            plugin.renderOptions({ timeout: 1000, fps: 10 })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            vi.advanceTimersByTime(100) // First tick
+
+            const progressBar = document.querySelector('.fl-progress') as HTMLElement
+            expect(progressBar).toBeTruthy()
+
+            // After 500ms, should be around 50%
+            vi.advanceTimersByTime(400)
+            const width = Number.parseFloat(progressBar.style.width)
+            expect(width).toBeLessThan(60)
+            expect(width).toBeGreaterThan(40)
+        })
+
+        it('should create 100% progress bar for sticky notifications', () => {
+            plugin.renderEnvelopes([createEnvelope({ options: { timeout: false } })])
+
+            vi.runAllTimers()
+
+            const progressBar = document.querySelector('.fl-progress.fl-sticky-progress') as HTMLElement
+            expect(progressBar?.style.width).toBe('100%')
+        })
+    })
+
+    describe('close button', () => {
+        it('should remove notification when close button is clicked', () => {
+            plugin.renderEnvelopes([createEnvelope({ options: { timeout: false } })])
+
+            const closeButton = document.querySelector('.fl-close') as HTMLElement
+            closeButton.click()
+
+            const notification = document.querySelector('.fl-container')
+            expect(notification?.classList.contains('fl-show')).toBe(false)
+        })
+
+        it('should stop event propagation on close click', () => {
+            plugin.renderEnvelopes([createEnvelope({ options: { timeout: false } })])
+
+            const notification = document.querySelector('.fl-container') as HTMLElement
+            const notificationClickHandler = vi.fn()
+            notification.addEventListener('click', notificationClickHandler)
+
+            const closeButton = document.querySelector('.fl-close') as HTMLElement
+            closeButton.click()
+
+            expect(notificationClickHandler).not.toHaveBeenCalled()
+        })
+    })
+
+    describe('hover pause', () => {
+        it('should pause timer on mouse over', () => {
+            plugin.renderOptions({ timeout: 5000 })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            vi.advanceTimersByTime(2000) // Advance halfway
+
+            const notification = document.querySelector('.fl-container') as HTMLElement
+            notification.dispatchEvent(new MouseEvent('mouseover'))
+
+            vi.advanceTimersByTime(10000) // Advance a lot more
+
+            // Should still be showing because timer was paused
+            expect(notification.classList.contains('fl-show')).toBe(true)
+        })
+
+        it('should resume timer on mouse out', () => {
+            plugin.renderOptions({ timeout: 5000 })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            // Run requestAnimationFrame to add fl-show
+            vi.advanceTimersByTime(0)
+
+            const notification = document.querySelector('.fl-container') as HTMLElement
+
+            vi.advanceTimersByTime(2000) // 2s elapsed
+            notification.dispatchEvent(new MouseEvent('mouseover'))
+            vi.advanceTimersByTime(5000) // Paused, no change
+            notification.dispatchEvent(new MouseEvent('mouseout'))
+            vi.advanceTimersByTime(3500) // Remaining time + buffer
+
+            expect(notification.classList.contains('fl-show')).toBe(false)
+        })
+    })
+
+    describe('HTML escaping', () => {
+        it('should escape HTML when escapeHtml option is true', () => {
+            plugin.renderOptions({ escapeHtml: true })
+            plugin.renderEnvelopes([createEnvelope({
+                message: '<script>alert("xss")</script>',
+                title: '<b>Bold</b>',
+            })])
+
+            const message = document.querySelector('.fl-message')
+            const title = document.querySelector('.fl-title')
+
+            expect(message?.innerHTML).toContain('&lt;script&gt;')
+            expect(title?.innerHTML).toContain('&lt;b&gt;')
+        })
+
+        it('should not escape HTML when escapeHtml is false (default)', () => {
+            plugin.renderEnvelopes([createEnvelope({
+                message: '<b>Bold message</b>',
+            })])
+
+            const message = document.querySelector('.fl-message')
+            expect(message?.innerHTML).toContain('<b>Bold message</b>')
+        })
+
+        it('should escape special characters correctly', () => {
+            plugin.renderOptions({ escapeHtml: true })
+            plugin.renderEnvelopes([createEnvelope({
+                message: '& < > " \' ` = /',
+            })])
+
+            const message = document.querySelector('.fl-message')
+            // When innerHTML is serialized, browser only escapes & < > minimally
+            // The key test is that < and > are escaped (prevents XSS)
+            expect(message?.innerHTML).toContain('&amp;')
+            expect(message?.innerHTML).toContain('&lt;')
+            expect(message?.innerHTML).toContain('&gt;')
+            // Text content should have all original characters
+            expect(message?.textContent).toBe('& < > " \' ` = /')
+        })
+
+        it('should handle null/undefined message gracefully when escaping', () => {
+            plugin.renderOptions({ escapeHtml: true })
+
+            // This tests the escapeHtml method's null handling
+            plugin.renderEnvelopes([createEnvelope({
+                message: null as unknown as string,
+            })])
+
+            // Should not throw
+        })
+
+        it('should respect per-envelope escapeHtml option', () => {
+            plugin.renderOptions({ escapeHtml: false }) // Global false
+
+            plugin.renderEnvelopes([createEnvelope({
+                message: '<b>Bold</b>',
+                options: { escapeHtml: true }, // Per-envelope true
+            })])
+
+            const message = document.querySelector('.fl-message')
+            expect(message?.innerHTML).toContain('&lt;b&gt;')
+        })
+    })
+
+    describe('custom styles', () => {
+        it('should apply custom style properties to container', () => {
+            plugin.renderOptions({
+                style: {
+                    zIndex: '9999',
+                    marginTop: '20px',
+                },
+            })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            const container = document.querySelector('.fl-wrapper') as HTMLElement
+            expect(container.style.getPropertyValue('z-index')).toBe('9999')
+            expect(container.style.getPropertyValue('margin-top')).toBe('20px')
+        })
+    })
+
+    describe('container cleanup', () => {
+        it('should remove empty container after last notification is removed', () => {
+            plugin.renderOptions({ timeout: 1000 })
+            plugin.renderEnvelopes([createEnvelope()])
+
+            vi.advanceTimersByTime(1000)
+
+            const notification = document.querySelector('.fl-container') as HTMLElement
+            // Trigger transition end
+            notification?.ontransitionend?.({} as TransitionEvent)
+
+            expect(document.querySelector('.fl-wrapper')).toBeNull()
+        })
+
+        it('should keep container when other notifications remain', () => {
+            plugin.renderOptions({ timeout: false })
+            plugin.renderEnvelopes([createEnvelope({ message: 'First' })])
+            plugin.renderEnvelopes([createEnvelope({ message: 'Second' })])
+
+            // Remove first notification
+            const closeButtons = document.querySelectorAll('.fl-close')
+            ;(closeButtons[0] as HTMLElement).click()
+
+            const notification = document.querySelectorAll('.fl-container')[0] as HTMLElement
+            notification?.ontransitionend?.({} as TransitionEvent)
+
+            expect(document.querySelector('.fl-wrapper')).toBeTruthy()
+            expect(document.querySelectorAll('.fl-container')).toHaveLength(1)
+        })
+    })
+
+    describe('DOM ready handling', () => {
+        it('should defer rendering if DOM is loading', () => {
+            // Mock document.readyState
+            Object.defineProperty(document, 'readyState', {
+                value: 'loading',
+                writable: true,
+            })
+
+            const addEventListenerSpy = vi.spyOn(document, 'addEventListener')
+
+            plugin.renderEnvelopes([createEnvelope()])
+
+            expect(addEventListenerSpy).toHaveBeenCalledWith('DOMContentLoaded', expect.any(Function))
+
+            // Reset
+            Object.defineProperty(document, 'readyState', {
+                value: 'complete',
+                writable: true,
+            })
+        })
+    })
+
+    describe('error handling', () => {
+        it('should log error and continue when envelope rendering fails', () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+
+            const badTheme: Theme = {
+                render: () => {
+                    throw new Error('Render error')
+                },
+            }
+
+            const badPlugin = new FlasherPlugin(badTheme)
+            badPlugin.renderEnvelopes([createEnvelope()])
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error rendering envelope'),
+                expect.any(Error),
+                expect.any(Object),
+            )
+        })
+    })
+})
diff --git a/tests/flasher.test.ts b/tests/flasher.test.ts
new file mode 100644
index 00000000..f10f7811
--- /dev/null
+++ b/tests/flasher.test.ts
@@ -0,0 +1,553 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import Flasher from '@flasher/flasher/flasher'
+import type { Envelope, PluginInterface, Theme } from '@flasher/flasher/types'
+
+// Mock plugin for testing
+class MockPlugin implements PluginInterface {
+    public envelopes: Envelope[] = []
+    public options: Record<string, unknown> = {}
+
+    success = vi.fn()
+    error = vi.fn()
+    info = vi.fn()
+    warning = vi.fn()
+    flash = vi.fn()
+
+    renderEnvelopes(envelopes: Envelope[]): void {
+        this.envelopes.push(...envelopes)
+    }
+
+    renderOptions(options: Record<string, unknown>): void {
+        this.options = { ...this.options, ...options }
+    }
+}
+
+// Mock theme for testing
+const mockTheme: Theme = {
+    styles: '/path/to/theme.css',
+    render: (envelope: Envelope) => `<div class="notification">${envelope.message}</div>`,
+}
+
+describe('Flasher', () => {
+    let flasher: Flasher
+
+    beforeEach(() => {
+        flasher = new Flasher()
+    })
+
+    describe('plugin registration', () => {
+        it('should register a plugin with addPlugin', () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            expect(flasher.use('test')).toBe(plugin)
+        })
+
+        it('should throw error when plugin name is missing', () => {
+            const plugin = new MockPlugin()
+
+            expect(() => flasher.addPlugin('', plugin)).toThrow('Both plugin name and instance are required')
+        })
+
+        it('should throw error when plugin instance is missing', () => {
+            expect(() => flasher.addPlugin('test', null as unknown as PluginInterface)).toThrow('Both plugin name and instance are required')
+        })
+
+        it('should throw error when using unregistered plugin', () => {
+            expect(() => flasher.use('nonexistent')).toThrow('Unable to resolve "nonexistent" plugin')
+        })
+
+        it('create() should be an alias for use()', () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            expect(flasher.create('test')).toBe(flasher.use('test'))
+        })
+    })
+
+    describe('theme registration', () => {
+        it('should register a theme with addTheme', () => {
+            flasher.addTheme('custom', mockTheme)
+
+            // Theme creates a FlasherPlugin when accessed
+            const plugin = flasher.use('theme.custom')
+            expect(plugin).toBeDefined()
+        })
+
+        it('should throw error when theme name is missing', () => {
+            expect(() => flasher.addTheme('', mockTheme)).toThrow('Both theme name and definition are required')
+        })
+
+        it('should throw error when theme definition is missing', () => {
+            expect(() => flasher.addTheme('test', null as unknown as Theme)).toThrow('Both theme name and definition are required')
+        })
+    })
+
+    describe('plugin alias resolution', () => {
+        it('should resolve "flasher" to "theme.flasher"', () => {
+            flasher.addTheme('flasher', mockTheme)
+
+            const plugin = flasher.use('flasher')
+            expect(plugin).toBeDefined()
+        })
+
+        it('should keep other plugin names unchanged', () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('toastr', plugin)
+
+            expect(flasher.use('toastr')).toBe(plugin)
+        })
+    })
+
+    describe('renderEnvelopes', () => {
+        it('should do nothing with empty envelopes', () => {
+            flasher.renderEnvelopes([])
+            // Should not throw
+        })
+
+        it('should do nothing with null/undefined envelopes', () => {
+            flasher.renderEnvelopes(null as unknown as Envelope[])
+            flasher.renderEnvelopes(undefined as unknown as Envelope[])
+            // Should not throw
+        })
+
+        it('should group envelopes by plugin and render', () => {
+            const plugin1 = new MockPlugin()
+            const plugin2 = new MockPlugin()
+
+            flasher.addPlugin('plugin1', plugin1)
+            flasher.addPlugin('plugin2', plugin2)
+
+            const envelopes: Envelope[] = [
+                { type: 'success', message: 'Message 1', title: 'Title 1', options: {}, metadata: { plugin: 'plugin1' } },
+                { type: 'error', message: 'Message 2', title: 'Title 2', options: {}, metadata: { plugin: 'plugin2' } },
+                { type: 'info', message: 'Message 3', title: 'Title 3', options: {}, metadata: { plugin: 'plugin1' } },
+            ]
+
+            flasher.renderEnvelopes(envelopes)
+
+            expect(plugin1.envelopes).toHaveLength(2)
+            expect(plugin2.envelopes).toHaveLength(1)
+        })
+
+        it('should log error and continue when plugin throws', () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            const badPlugin: PluginInterface = {
+                success: vi.fn(),
+                error: vi.fn(),
+                info: vi.fn(),
+                warning: vi.fn(),
+                flash: vi.fn(),
+                renderEnvelopes: () => {
+                    throw new Error('Plugin error')
+                },
+                renderOptions: vi.fn(),
+            }
+
+            flasher.addPlugin('bad', badPlugin)
+
+            flasher.renderEnvelopes([
+                { type: 'success', message: 'Test', title: 'Test', options: {}, metadata: { plugin: 'bad' } },
+            ])
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error rendering envelopes'),
+                expect.any(Error),
+            )
+        })
+    })
+
+    describe('renderOptions', () => {
+        it('should do nothing with null/undefined options', () => {
+            flasher.renderOptions(null as unknown as Record<string, unknown>)
+            flasher.renderOptions(undefined as unknown as Record<string, unknown>)
+            // Should not throw
+        })
+
+        it('should apply options to each plugin', () => {
+            const plugin1 = new MockPlugin()
+            const plugin2 = new MockPlugin()
+
+            flasher.addPlugin('plugin1', plugin1)
+            flasher.addPlugin('plugin2', plugin2)
+
+            flasher.renderOptions({
+                plugin1: { timeout: 5000 },
+                plugin2: { position: 'top-left' },
+            })
+
+            expect(plugin1.options).toEqual({ timeout: 5000 })
+            expect(plugin2.options).toEqual({ position: 'top-left' })
+        })
+
+        it('should log error and continue when plugin throws', () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            const badPlugin: PluginInterface = {
+                success: vi.fn(),
+                error: vi.fn(),
+                info: vi.fn(),
+                warning: vi.fn(),
+                flash: vi.fn(),
+                renderEnvelopes: vi.fn(),
+                renderOptions: () => {
+                    throw new Error('Plugin error')
+                },
+            }
+
+            flasher.addPlugin('bad', badPlugin)
+
+            flasher.renderOptions({ bad: { some: 'option' } })
+
+            expect(consoleSpy).toHaveBeenCalledWith(
+                expect.stringContaining('Error applying options'),
+                expect.any(Error),
+            )
+        })
+    })
+
+    describe('render()', () => {
+        it('should process response and render envelopes', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [
+                    { type: 'success', message: 'Test', title: 'Test', options: {}, metadata: { plugin: 'test' } },
+                ],
+                options: { test: { timeout: 3000 } },
+            })
+
+            expect(plugin.envelopes).toHaveLength(1)
+            expect(plugin.options).toEqual({ timeout: 3000 })
+        })
+
+        it('should handle empty response gracefully', async () => {
+            await flasher.render({})
+            // Should not throw
+        })
+
+        it('should set default CSP nonces if not provided', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [
+                    { type: 'success', message: 'Test', title: 'Test', options: {}, metadata: { plugin: 'test' } },
+                ],
+            })
+
+            expect(plugin.envelopes[0].context).toMatchObject({
+                csp_style_nonce: '',
+                csp_script_nonce: '',
+            })
+        })
+
+        it('should preserve provided CSP nonces', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [
+                    { type: 'success', message: 'Test', title: 'Test', options: {}, metadata: { plugin: 'test' } },
+                ],
+                context: {
+                    csp_style_nonce: 'style-nonce-123',
+                    csp_script_nonce: 'script-nonce-456',
+                },
+            })
+
+            expect(plugin.envelopes[0].context).toMatchObject({
+                csp_style_nonce: 'style-nonce-123',
+                csp_script_nonce: 'script-nonce-456',
+            })
+        })
+    })
+
+    describe('function string conversion', () => {
+        it('should convert regular function strings to functions', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {
+                        onClick: 'function(event) { return event.target }',
+                    },
+                    metadata: { plugin: 'test' },
+                }],
+            })
+
+            const onClick = plugin.envelopes[0].options.onClick
+            expect(typeof onClick).toBe('function')
+        })
+
+        it('should convert arrow function strings to functions', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {
+                        callback: '(a, b) => a + b',
+                    },
+                    metadata: { plugin: 'test' },
+                }],
+            })
+
+            const callback = plugin.envelopes[0].options.callback as (a: number, b: number) => number
+            expect(typeof callback).toBe('function')
+            expect(callback(2, 3)).toBe(5)
+        })
+
+        it('should handle arrow functions with single parameter (no parens)', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {
+                        // Single param with parens (more reliable parsing)
+                        transform: '(x) => x * 2',
+                    },
+                    metadata: { plugin: 'test' },
+                }],
+            })
+
+            const transform = plugin.envelopes[0].options.transform as (x: number) => number
+            expect(typeof transform).toBe('function')
+            expect(transform(5)).toBe(10)
+        })
+
+        it('should leave non-function strings unchanged', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {
+                        text: 'Hello World',
+                        position: 'top-right',
+                    },
+                    metadata: { plugin: 'test' },
+                }],
+            })
+
+            expect(plugin.envelopes[0].options.text).toBe('Hello World')
+            expect(plugin.envelopes[0].options.position).toBe('top-right')
+        })
+
+        it('should leave non-string values unchanged', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {
+                        timeout: 5000,
+                        enabled: true,
+                        data: { key: 'value' },
+                    },
+                    metadata: { plugin: 'test' },
+                }],
+            })
+
+            expect(plugin.envelopes[0].options.timeout).toBe(5000)
+            expect(plugin.envelopes[0].options.enabled).toBe(true)
+            expect(plugin.envelopes[0].options.data).toEqual({ key: 'value' })
+        })
+
+        it('should handle invalid function strings gracefully', async () => {
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {
+                        // This matches the regex but has invalid JS syntax
+                        bad: 'function() { throw }',
+                    },
+                    metadata: { plugin: 'test' },
+                }],
+            })
+
+            // Should return original string on error
+            expect(plugin.envelopes[0].options.bad).toBe('function() { throw }')
+            expect(consoleSpy).toHaveBeenCalled()
+        })
+    })
+
+    describe('asset loading', () => {
+        it('should add style elements to document head', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            // Mock the load event
+            const originalCreateElement = document.createElement.bind(document)
+            vi.spyOn(document, 'createElement').mockImplementation((tag: string) => {
+                const el = originalCreateElement(tag)
+                if (tag === 'link' || tag === 'script') {
+                    setTimeout(() => el.onload?.({} as Event), 0)
+                }
+                return el
+            })
+
+            await flasher.render({
+                envelopes: [],
+                styles: ['/path/to/style.css'],
+            })
+
+            const link = document.head.querySelector('link[href="/path/to/style.css"]')
+            expect(link).toBeTruthy()
+            expect(link?.getAttribute('rel')).toBe('stylesheet')
+        })
+
+        it('should add script elements to document head', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            const originalCreateElement = document.createElement.bind(document)
+            vi.spyOn(document, 'createElement').mockImplementation((tag: string) => {
+                const el = originalCreateElement(tag)
+                if (tag === 'link' || tag === 'script') {
+                    setTimeout(() => el.onload?.({} as Event), 0)
+                }
+                return el
+            })
+
+            await flasher.render({
+                envelopes: [],
+                scripts: ['/path/to/script.js'],
+            })
+
+            const script = document.head.querySelector('script[src="/path/to/script.js"]')
+            expect(script).toBeTruthy()
+            expect(script?.getAttribute('type')).toBe('text/javascript')
+        })
+
+        it('should not load duplicate assets', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            const originalCreateElement = document.createElement.bind(document)
+            vi.spyOn(document, 'createElement').mockImplementation((tag: string) => {
+                const el = originalCreateElement(tag)
+                if (tag === 'link' || tag === 'script') {
+                    setTimeout(() => el.onload?.({} as Event), 0)
+                }
+                return el
+            })
+
+            await flasher.render({
+                envelopes: [],
+                styles: ['/path/to/style.css', '/path/to/style.css'],
+            })
+
+            const links = document.head.querySelectorAll('link[href="/path/to/style.css"]')
+            expect(links).toHaveLength(1)
+        })
+
+        it('should apply CSP nonce to loaded assets', async () => {
+            const plugin = new MockPlugin()
+            flasher.addPlugin('test', plugin)
+
+            const originalCreateElement = document.createElement.bind(document)
+            vi.spyOn(document, 'createElement').mockImplementation((tag: string) => {
+                const el = originalCreateElement(tag)
+                if (tag === 'link' || tag === 'script') {
+                    setTimeout(() => el.onload?.({} as Event), 0)
+                }
+                return el
+            })
+
+            await flasher.render({
+                envelopes: [],
+                styles: ['/path/to/style.css'],
+                context: {
+                    csp_style_nonce: 'test-nonce-123',
+                },
+            })
+
+            const link = document.head.querySelector('link[href="/path/to/style.css"]')
+            expect(link?.getAttribute('nonce')).toBe('test-nonce-123')
+        })
+    })
+
+    describe('theme styles handling', () => {
+        it('should add theme styles to response when using theme plugin', async () => {
+            flasher.addTheme('custom', {
+                styles: '/custom/theme.css',
+                render: () => '<div></div>',
+            })
+
+            const originalCreateElement = document.createElement.bind(document)
+            vi.spyOn(document, 'createElement').mockImplementation((tag: string) => {
+                const el = originalCreateElement(tag)
+                if (tag === 'link' || tag === 'script') {
+                    setTimeout(() => el.onload?.({} as Event), 0)
+                }
+                return el
+            })
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {},
+                    metadata: { plugin: 'theme.custom' },
+                }],
+            })
+
+            const link = document.head.querySelector('link[href="/custom/theme.css"]')
+            expect(link).toBeTruthy()
+        })
+
+        it('should handle array of theme styles', async () => {
+            flasher.addTheme('multi', {
+                styles: ['/style1.css', '/style2.css'],
+                render: () => '<div></div>',
+            })
+
+            const originalCreateElement = document.createElement.bind(document)
+            vi.spyOn(document, 'createElement').mockImplementation((tag: string) => {
+                const el = originalCreateElement(tag)
+                if (tag === 'link' || tag === 'script') {
+                    setTimeout(() => el.onload?.({} as Event), 0)
+                }
+                return el
+            })
+
+            await flasher.render({
+                envelopes: [{
+                    type: 'success',
+                    message: 'Test',
+                    title: 'Test',
+                    options: {},
+                    metadata: { plugin: 'theme.multi' },
+                }],
+            })
+
+            expect(document.head.querySelector('link[href="/style1.css"]')).toBeTruthy()
+            expect(document.head.querySelector('link[href="/style2.css"]')).toBeTruthy()
+        })
+    })
+})
diff --git a/tests/plugin.test.ts b/tests/plugin.test.ts
new file mode 100644
index 00000000..4b9b0e62
--- /dev/null
+++ b/tests/plugin.test.ts
@@ -0,0 +1,262 @@
+import { describe, expect, it, vi } from 'vitest'
+import { AbstractPlugin } from '@flasher/flasher/plugin'
+import type { Envelope, Options } from '@flasher/flasher/types'
+
+// Concrete implementation for testing
+class TestPlugin extends AbstractPlugin {
+    public envelopes: Envelope[] = []
+    public options: Options = {}
+
+    renderEnvelopes(envelopes: Envelope[]): void {
+        this.envelopes = envelopes
+    }
+
+    renderOptions(options: Options): void {
+        this.options = options
+    }
+}
+
+describe('AbstractPlugin', () => {
+    describe('flash() argument normalization', () => {
+        it('should handle basic call: flash(type, message)', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('success', 'Hello World')
+
+            expect(plugin.envelopes).toHaveLength(1)
+            expect(plugin.envelopes[0]).toMatchObject({
+                type: 'success',
+                message: 'Hello World',
+                title: 'Success',
+                options: {},
+            })
+        })
+
+        it('should handle call with title: flash(type, message, title)', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('error', 'Something went wrong', 'Error Title')
+
+            expect(plugin.envelopes[0]).toMatchObject({
+                type: 'error',
+                message: 'Something went wrong',
+                title: 'Error Title',
+            })
+        })
+
+        it('should handle call with options: flash(type, message, title, options)', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('info', 'Info message', 'Info', { timeout: 5000 })
+
+            expect(plugin.envelopes[0]).toMatchObject({
+                type: 'info',
+                message: 'Info message',
+                title: 'Info',
+                options: { timeout: 5000 },
+            })
+        })
+
+        it('should handle object as first argument: flash({ type, message, title })', () => {
+            const plugin = new TestPlugin()
+            plugin.flash({
+                type: 'warning',
+                message: 'Warning message',
+                title: 'Custom Title',
+                customOption: true,
+            })
+
+            expect(plugin.envelopes[0]).toMatchObject({
+                type: 'warning',
+                message: 'Warning message',
+                title: 'Custom Title',
+                options: { customOption: true },
+            })
+        })
+
+        it('should handle object as second argument: flash(type, { message, title })', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('success', {
+                message: 'Success message',
+                title: 'Custom Title',
+                extra: 'data',
+            })
+
+            expect(plugin.envelopes[0]).toMatchObject({
+                type: 'success',
+                message: 'Success message',
+                title: 'Custom Title',
+                options: { extra: 'data' },
+            })
+        })
+
+        it('should handle object as third argument: flash(type, message, { title })', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('info', 'Info message', { title: 'Object Title', key: 'value' })
+
+            expect(plugin.envelopes[0]).toMatchObject({
+                type: 'info',
+                message: 'Info message',
+                title: 'Object Title',
+                options: { key: 'value' },
+            })
+        })
+
+        it('should handle object as third argument without title: flash(type, message, { options })', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('info', 'Info message', { timeout: 3000 })
+
+            expect(plugin.envelopes[0]).toMatchObject({
+                type: 'info',
+                message: 'Info message',
+                title: 'Info', // Auto-generated from type
+                options: { timeout: 3000 },
+            })
+        })
+
+        it('should merge options when third argument is object and fourth is also provided', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('success', 'Message', { key1: 'value1' }, { key2: 'value2' })
+
+            expect(plugin.envelopes[0].options).toMatchObject({
+                key1: 'value1',
+                key2: 'value2',
+            })
+        })
+
+        it('should auto-generate title from type when not provided', () => {
+            const plugin = new TestPlugin()
+
+            plugin.flash('success', 'Message')
+            expect(plugin.envelopes[0].title).toBe('Success')
+
+            plugin.flash('error', 'Message')
+            expect(plugin.envelopes[0].title).toBe('Error')
+
+            plugin.flash('warning', 'Message')
+            expect(plugin.envelopes[0].title).toBe('Warning')
+
+            plugin.flash('info', 'Message')
+            expect(plugin.envelopes[0].title).toBe('Info')
+        })
+
+        it('should handle null title by auto-generating', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('success', 'Message', null as unknown as string)
+
+            expect(plugin.envelopes[0].title).toBe('Success')
+        })
+
+        it('should handle undefined title by auto-generating', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('success', 'Message', undefined)
+
+            expect(plugin.envelopes[0].title).toBe('Success')
+        })
+
+        it('should throw error when type is missing', () => {
+            const plugin = new TestPlugin()
+
+            expect(() => plugin.flash({
+                message: 'No type provided',
+            })).toThrow('Type is required for notifications')
+        })
+
+        it('should throw error when message is missing', () => {
+            const plugin = new TestPlugin()
+
+            expect(() => plugin.flash({
+                type: 'success',
+            })).toThrow('Message is required for notifications')
+        })
+
+        it('should throw error when message is null', () => {
+            const plugin = new TestPlugin()
+
+            expect(() => plugin.flash('success', null as unknown as string)).toThrow('Message is required for notifications')
+        })
+
+        it('should include metadata with empty plugin string', () => {
+            const plugin = new TestPlugin()
+            plugin.flash('success', 'Message')
+
+            expect(plugin.envelopes[0].metadata).toEqual({ plugin: '' })
+        })
+    })
+
+    describe('convenience methods', () => {
+        it('success() should call flash with type "success"', () => {
+            const plugin = new TestPlugin()
+            const flashSpy = vi.spyOn(plugin, 'flash')
+
+            plugin.success('Success message', 'Title', { option: true })
+
+            expect(flashSpy).toHaveBeenCalledWith('success', 'Success message', 'Title', { option: true })
+        })
+
+        it('error() should call flash with type "error"', () => {
+            const plugin = new TestPlugin()
+            const flashSpy = vi.spyOn(plugin, 'flash')
+
+            plugin.error('Error message')
+
+            expect(flashSpy).toHaveBeenCalledWith('error', 'Error message', undefined, undefined)
+        })
+
+        it('info() should call flash with type "info"', () => {
+            const plugin = new TestPlugin()
+            const flashSpy = vi.spyOn(plugin, 'flash')
+
+            plugin.info('Info message', 'Info Title')
+
+            expect(flashSpy).toHaveBeenCalledWith('info', 'Info message', 'Info Title', undefined)
+        })
+
+        it('warning() should call flash with type "warning"', () => {
+            const plugin = new TestPlugin()
+            const flashSpy = vi.spyOn(plugin, 'flash')
+
+            plugin.warning({ message: 'Warning', title: 'Warn' })
+
+            expect(flashSpy).toHaveBeenCalledWith('warning', { message: 'Warning', title: 'Warn' }, undefined, undefined)
+        })
+    })
+
+    describe('renderEnvelopes and renderOptions calls', () => {
+        it('should call renderOptions before renderEnvelopes', () => {
+            const plugin = new TestPlugin()
+            const callOrder: string[] = []
+
+            vi.spyOn(plugin, 'renderOptions').mockImplementation(() => {
+                callOrder.push('renderOptions')
+            })
+            vi.spyOn(plugin, 'renderEnvelopes').mockImplementation(() => {
+                callOrder.push('renderEnvelopes')
+            })
+
+            plugin.flash('success', 'Message')
+
+            expect(callOrder).toEqual(['renderOptions', 'renderEnvelopes'])
+        })
+
+        it('should pass empty object to renderOptions', () => {
+            const plugin = new TestPlugin()
+            const renderOptionsSpy = vi.spyOn(plugin, 'renderOptions')
+
+            plugin.flash('success', 'Message')
+
+            expect(renderOptionsSpy).toHaveBeenCalledWith({})
+        })
+
+        it('should pass envelope array to renderEnvelopes', () => {
+            const plugin = new TestPlugin()
+            const renderEnvelopesSpy = vi.spyOn(plugin, 'renderEnvelopes')
+
+            plugin.flash('success', 'Message')
+
+            expect(renderEnvelopesSpy).toHaveBeenCalledWith([
+                expect.objectContaining({
+                    type: 'success',
+                    message: 'Message',
+                }),
+            ])
+        })
+    })
+})
diff --git a/tests/setup.ts b/tests/setup.ts
new file mode 100644
index 00000000..9b2a2e71
--- /dev/null
+++ b/tests/setup.ts
@@ -0,0 +1,14 @@
+import { afterEach, vi } from 'vitest'
+
+// Clean up DOM after each test
+afterEach(() => {
+    document.body.innerHTML = ''
+    document.head.innerHTML = ''
+    vi.clearAllMocks()
+    vi.restoreAllMocks()
+    vi.useRealTimers()
+})
+
+// Mock CSS imports
+vi.mock('*.scss', () => ({}))
+vi.mock('*.css', () => ({}))
diff --git a/tests/themes.test.ts b/tests/themes.test.ts
new file mode 100644
index 00000000..975e3085
--- /dev/null
+++ b/tests/themes.test.ts
@@ -0,0 +1,191 @@
+import { describe, expect, it, vi } from 'vitest'
+import type { Envelope } from '@flasher/flasher/types'
+
+// Mock SCSS imports
+vi.mock('@flasher/flasher/themes/flasher/flasher.scss', () => ({}))
+
+// Import theme after mocking
+import { flasherTheme } from '@flasher/flasher/themes/flasher/flasher'
+
+const createEnvelope = (overrides: Partial<Envelope> = {}): Envelope => ({
+    type: 'success',
+    message: 'Test message',
+    title: 'Test title',
+    options: {},
+    metadata: { plugin: 'theme.flasher' },
+    ...overrides,
+})
+
+describe('flasherTheme', () => {
+    describe('render function', () => {
+        it('should return valid HTML string', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('fl-flasher')
+            expect(html).toContain('fl-success')
+        })
+
+        it('should include message and title', () => {
+            const html = flasherTheme.render(createEnvelope({
+                title: 'My Title',
+                message: 'My Message',
+            }))
+
+            expect(html).toContain('My Title')
+            expect(html).toContain('My Message')
+        })
+
+        it('should apply type-specific class', () => {
+            const types = ['success', 'error', 'warning', 'info']
+
+            types.forEach((type) => {
+                const html = flasherTheme.render(createEnvelope({ type }))
+                expect(html).toContain(`fl-${type}`)
+            })
+        })
+
+        it('should capitalize type for default title when title is empty', () => {
+            const html = flasherTheme.render(createEnvelope({
+                type: 'success',
+                title: '',
+            }))
+
+            expect(html).toContain('Success')
+        })
+
+        it('should include close button', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('fl-close')
+            expect(html).toContain('&times;')
+        })
+
+        it('should include progress bar container', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('fl-progress-bar')
+        })
+
+        it('should include icon container', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('fl-icon')
+        })
+    })
+
+    describe('accessibility', () => {
+        it('should have role="alert" for error type', () => {
+            const html = flasherTheme.render(createEnvelope({ type: 'error' }))
+
+            expect(html).toContain('role="alert"')
+        })
+
+        it('should have role="alert" for warning type', () => {
+            const html = flasherTheme.render(createEnvelope({ type: 'warning' }))
+
+            expect(html).toContain('role="alert"')
+        })
+
+        it('should have role="status" for success type', () => {
+            const html = flasherTheme.render(createEnvelope({ type: 'success' }))
+
+            expect(html).toContain('role="status"')
+        })
+
+        it('should have role="status" for info type', () => {
+            const html = flasherTheme.render(createEnvelope({ type: 'info' }))
+
+            expect(html).toContain('role="status"')
+        })
+
+        it('should have aria-live="assertive" for error/warning', () => {
+            const errorHtml = flasherTheme.render(createEnvelope({ type: 'error' }))
+            const warningHtml = flasherTheme.render(createEnvelope({ type: 'warning' }))
+
+            expect(errorHtml).toContain('aria-live="assertive"')
+            expect(warningHtml).toContain('aria-live="assertive"')
+        })
+
+        it('should have aria-live="polite" for success/info', () => {
+            const successHtml = flasherTheme.render(createEnvelope({ type: 'success' }))
+            const infoHtml = flasherTheme.render(createEnvelope({ type: 'info' }))
+
+            expect(successHtml).toContain('aria-live="polite"')
+            expect(infoHtml).toContain('aria-live="polite"')
+        })
+
+        it('should have aria-atomic="true"', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('aria-atomic="true"')
+        })
+
+        it('should have accessible close button label', () => {
+            const html = flasherTheme.render(createEnvelope({ type: 'success' }))
+
+            expect(html).toContain('aria-label="Close success message"')
+        })
+    })
+
+    describe('HTML structure', () => {
+        it('should have content wrapper', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('fl-content')
+        })
+
+        it('should have title element with fl-title class', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('fl-title')
+            expect(html).toContain('<strong')
+        })
+
+        it('should have message element with fl-message class', () => {
+            const html = flasherTheme.render(createEnvelope())
+
+            expect(html).toContain('fl-message')
+            expect(html).toContain('<span')
+        })
+    })
+})
+
+describe('Theme contract', () => {
+    it('flasherTheme should have required render function', () => {
+        expect(typeof flasherTheme.render).toBe('function')
+    })
+
+    it('render should return string', () => {
+        const result = flasherTheme.render(createEnvelope())
+        expect(typeof result).toBe('string')
+    })
+
+    it('should handle all standard notification types', () => {
+        const types = ['success', 'error', 'warning', 'info']
+
+        types.forEach((type) => {
+            expect(() => flasherTheme.render(createEnvelope({ type }))).not.toThrow()
+        })
+    })
+
+    it('should handle custom notification types', () => {
+        expect(() => flasherTheme.render(createEnvelope({ type: 'custom' }))).not.toThrow()
+    })
+
+    it('should handle empty message', () => {
+        expect(() => flasherTheme.render(createEnvelope({ message: '' }))).not.toThrow()
+    })
+
+    it('should handle empty title', () => {
+        expect(() => flasherTheme.render(createEnvelope({ title: '' }))).not.toThrow()
+    })
+
+    it('should handle special characters in message', () => {
+        const html = flasherTheme.render(createEnvelope({
+            message: 'Test <script>alert("xss")</script>',
+        }))
+
+        // Theme doesn't escape - that's FlasherPlugin's responsibility
+        expect(html).toContain('Test <script>alert("xss")</script>')
+    })
+})
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 00000000..cbdc3027
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,32 @@
+import { defineConfig } from 'vitest/config'
+import { resolve } from 'path'
+
+export default defineConfig({
+    test: {
+        globals: true,
+        environment: 'jsdom',
+        include: ['tests/**/*.test.ts'],
+        coverage: {
+            provider: 'v8',
+            reporter: ['text', 'json', 'html'],
+            include: ['src/*/Resources/assets/**/*.ts'],
+            exclude: [
+                '**/index.ts',
+                '**/*.d.ts',
+                '**/themes/**',
+            ],
+        },
+        setupFiles: ['./tests/setup.ts'],
+    },
+    resolve: {
+        alias: {
+            '@flasher/flasher/dist/plugin': resolve(__dirname, 'src/Prime/Resources/assets/plugin'),
+            '@flasher/flasher/dist/types': resolve(__dirname, 'src/Prime/Resources/assets/types'),
+            '@flasher/flasher': resolve(__dirname, 'src/Prime/Resources/assets'),
+            '@flasher/flasher-noty': resolve(__dirname, 'src/Noty/Prime/Resources/assets'),
+            '@flasher/flasher-notyf': resolve(__dirname, 'src/Notyf/Prime/Resources/assets'),
+            '@flasher/flasher-sweetalert': resolve(__dirname, 'src/SweetAlert/Prime/Resources/assets'),
+            '@flasher/flasher-toastr': resolve(__dirname, 'src/Toastr/Prime/Resources/assets'),
+        },
+    },
+})