diff --git a/SCRIPT_JSON_PATTERN.md b/SCRIPT_JSON_PATTERN.md
new file mode 100644
index 000000000..855da4eda
--- /dev/null
+++ b/SCRIPT_JSON_PATTERN.md
@@ -0,0 +1,736 @@
+# Script.json - Complete JavaScript/TypeScript Abstraction
+
+## Concept
+
+Just as `styles.json` abstracts CSS into declarative JSON, **`script.json` abstracts executable JavaScript/TypeScript** - functions, promises, async/await, classes, React hooks, generators, and all runtime behavior.
+
+## Why This Matters
+
+**Everything as Data**: When code is represented as JSON:
+- **Non-developers** can understand and modify logic
+- **AI/LLMs** can reason about and generate code more reliably
+- **Visual editors** can provide drag-and-drop programming
+- **Code generation** becomes schema transformation
+- **Multi-language output** from a single source (TS, JS, Rust, Python)
+- **Version control** shows semantic changes, not syntax changes
+
+## Architecture
+
+```
+script.json (Abstract Syntax)
+    ↓
+ScriptCompiler
+    ↓
+TypeScript/JavaScript Output
+    ↓
+Runtime Execution
+```
+
+## Schema Structure
+
+### 1. Module System
+
+```json
+{
+  "imports": [
+    {
+      "module": "react",
+      "imports": ["useState", "useEffect"],
+      "type": "named"
+    }
+  ]
+}
+```
+
+Compiles to:
+```typescript
+import { useState, useEffect } from 'react';
+```
+
+### 2. Constants & Variables
+
+```json
+{
+  "constants": [
+    {
+      "name": "API_BASE_URL",
+      "value": "https://api.example.com",
+      "type": "string",
+      "exported": true
+    }
+  ],
+  "variables": [
+    {
+      "name": "cacheStore",
+      "kind": "let",
+      "initialValue": {
+        "expression": "new Map()",
+        "type": "constructor"
+      }
+    }
+  ]
+}
+```
+
+Compiles to:
+```typescript
+export const API_BASE_URL = "https://api.example.com";
+let cacheStore = new Map();
+```
+
+### 3. Functions (Async/Sync)
+
+```json
+{
+  "functions": [
+    {
+      "name": "fetchUserData",
+      "async": true,
+      "params": [
+        { "name": "userId", "type": "string" }
+      ],
+      "returnType": "Promise<User>",
+      "body": [
+        {
+          "type": "const_declaration",
+          "name": "response",
+          "value": {
+            "type": "await",
+            "expression": {
+              "type": "call_expression",
+              "callee": "fetch",
+              "args": ["/api/users/${userId}"]
+            }
+          }
+        },
+        {
+          "type": "return",
+          "value": "$ref:local.response"
+        }
+      ]
+    }
+  ]
+}
+```
+
+Compiles to:
+```typescript
+async function fetchUserData(userId: string): Promise<User> {
+  const response = await fetch(`/api/users/${userId}`);
+  return response;
+}
+```
+
+### 4. Control Flow
+
+**If Statements**:
+```json
+{
+  "type": "if_statement",
+  "condition": {
+    "type": "binary_expression",
+    "left": "$ref:local.count",
+    "operator": ">",
+    "right": 0
+  },
+  "then": [
+    { "type": "return", "value": true }
+  ],
+  "else": [
+    { "type": "return", "value": false }
+  ]
+}
+```
+
+**Loops**:
+```json
+{
+  "type": "for_loop",
+  "init": { "type": "const_declaration", "name": "i", "value": 0 },
+  "condition": {
+    "type": "binary_expression",
+    "left": "$ref:local.i",
+    "operator": "<",
+    "right": 10
+  },
+  "update": {
+    "type": "update_expression",
+    "operator": "++",
+    "argument": "$ref:local.i"
+  },
+  "body": [
+    {
+      "type": "call_expression",
+      "callee": "console.log",
+      "args": ["$ref:local.i"]
+    }
+  ]
+}
+```
+
+### 5. Error Handling
+
+```json
+{
+  "type": "try_catch",
+  "try": [
+    {
+      "type": "const_declaration",
+      "name": "data",
+      "value": {
+        "type": "await",
+        "expression": {
+          "type": "call_expression",
+          "callee": "fetchData",
+          "args": []
+        }
+      }
+    }
+  ],
+  "catch": {
+    "param": "error",
+    "body": [
+      {
+        "type": "call_expression",
+        "callee": "console.error",
+        "args": ["$ref:catch.error"]
+      }
+    ]
+  },
+  "finally": [
+    {
+      "type": "call_expression",
+      "callee": "cleanup",
+      "args": []
+    }
+  ]
+}
+```
+
+### 6. Classes
+
+```json
+{
+  "classes": [
+    {
+      "name": "ApiClient",
+      "properties": [
+        { "name": "baseUrl", "type": "string", "visibility": "private" }
+      ],
+      "constructor": {
+        "params": [{ "name": "config", "type": "object" }],
+        "body": [
+          {
+            "type": "assignment",
+            "target": "this.baseUrl",
+            "value": "$ref:params.config.baseUrl"
+          }
+        ]
+      },
+      "methods": [
+        {
+          "name": "get",
+          "async": true,
+          "visibility": "public",
+          "params": [{ "name": "endpoint", "type": "string" }],
+          "returnType": "Promise<any>",
+          "body": [...]
+        }
+      ]
+    }
+  ]
+}
+```
+
+### 7. React Hooks
+
+```json
+{
+  "hooks": [
+    {
+      "name": "useFetch",
+      "params": [{ "name": "url", "type": "string" }],
+      "body": [
+        {
+          "type": "const_declaration",
+          "name": "[data, setData]",
+          "value": {
+            "type": "call_expression",
+            "callee": "useState",
+            "args": [null]
+          }
+        },
+        {
+          "type": "call_expression",
+          "callee": "useEffect",
+          "args": [
+            {
+              "type": "arrow_function",
+              "async": true,
+              "body": [...]
+            },
+            ["$ref:params.url"]
+          ]
+        },
+        {
+          "type": "return",
+          "value": {
+            "type": "object_literal",
+            "properties": {
+              "data": "$ref:local.data"
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
+```
+
+### 8. Promises & Async Operations
+
+```json
+{
+  "functions": [
+    {
+      "name": "retryWithBackoff",
+      "async": true,
+      "params": [
+        { "name": "fn", "type": "() => Promise<T>" },
+        { "name": "maxRetries", "type": "number" }
+      ],
+      "body": [
+        {
+          "type": "for_loop",
+          "init": { "name": "i", "value": 0 },
+          "condition": { "left": "$ref:local.i", "operator": "<", "right": "$ref:params.maxRetries" },
+          "body": [
+            {
+              "type": "try_catch",
+              "try": [
+                {
+                  "type": "return",
+                  "value": {
+                    "type": "await",
+                    "expression": {
+                      "type": "call_expression",
+                      "callee": "$ref:params.fn"
+                    }
+                  }
+                }
+              ],
+              "catch": {
+                "body": [
+                  {
+                    "type": "await",
+                    "expression": {
+                      "type": "call_expression",
+                      "callee": "delay",
+                      "args": [1000]
+                    }
+                  }
+                ]
+              }
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}
+```
+
+### 9. Generators
+
+```json
+{
+  "generators": [
+    {
+      "name": "range",
+      "generator": true,
+      "params": [
+        { "name": "start", "type": "number" },
+        { "name": "end", "type": "number" }
+      ],
+      "body": [
+        {
+          "type": "for_loop",
+          "init": { "name": "i", "value": "$ref:params.start" },
+          "condition": { "left": "$ref:local.i", "operator": "<=", "right": "$ref:params.end" },
+          "body": [
+            { "type": "yield", "value": "$ref:local.i" }
+          ]
+        }
+      ]
+    }
+  ]
+}
+```
+
+### 10. Event Handlers
+
+```json
+{
+  "events": [
+    {
+      "name": "UserLoggedInEvent",
+      "type": "CustomEvent",
+      "detail": {
+        "userId": "string",
+        "timestamp": "number"
+      }
+    }
+  ],
+  "event_handlers": [
+    {
+      "event": "$ref:events.user_logged_in_event",
+      "handler": {
+        "type": "arrow_function",
+        "params": [{ "name": "event", "type": "UserLoggedInEvent" }],
+        "body": [
+          {
+            "type": "call_expression",
+            "callee": "console.log",
+            "args": ["User logged in:", "$ref:params.event.detail.userId"]
+          }
+        ]
+      }
+    }
+  ]
+}
+```
+
+## Reference System
+
+The `$ref:` syntax creates references to:
+- **`$ref:params.userId`** - Function parameters
+- **`$ref:local.response`** - Local variables
+- **`$ref:constants.API_BASE_URL`** - Module constants
+- **`$ref:imports.axios.get`** - Imported functions
+- **`$ref:functions.delay`** - Other functions in the module
+- **`$ref:catch.error`** - Catch block error parameter
+
+This enables:
+- Type safety
+- Dependency tracking
+- Refactoring without string replacements
+- Dead code elimination
+
+## Compiler Implementation
+
+```typescript
+class ScriptCompiler {
+  private schema: ScriptSchema;
+
+  compile(): string {
+    const parts: string[] = [];
+
+    // Imports
+    if (this.schema.imports) {
+      parts.push(this.compileImports(this.schema.imports));
+    }
+
+    // Constants
+    if (this.schema.constants) {
+      parts.push(this.compileConstants(this.schema.constants));
+    }
+
+    // Functions
+    if (this.schema.functions) {
+      parts.push(...this.schema.functions.map(f => this.compileFunction(f)));
+    }
+
+    // Classes
+    if (this.schema.classes) {
+      parts.push(...this.schema.classes.map(c => this.compileClass(c)));
+    }
+
+    // Hooks
+    if (this.schema.hooks) {
+      parts.push(...this.schema.hooks.map(h => this.compileHook(h)));
+    }
+
+    return parts.join('\n\n');
+  }
+
+  private compileFunction(def: FunctionDefinition): string {
+    const asyncKw = def.async ? 'async ' : '';
+    const exportKw = def.exported ? 'export ' : '';
+    const params = def.params.map(p =>
+      `${p.name}${p.optional ? '?' : ''}: ${p.type}`
+    ).join(', ');
+
+    const body = this.compileBody(def.body);
+
+    return `${exportKw}${asyncKw}function ${def.name}(${params}): ${def.returnType} {\n${body}\n}`;
+  }
+
+  private compileBody(statements: Statement[]): string {
+    return statements.map(stmt => this.compileStatement(stmt)).join('\n');
+  }
+
+  private compileStatement(stmt: Statement): string {
+    switch (stmt.type) {
+      case 'const_declaration':
+        return `  const ${stmt.name} = ${this.compileExpression(stmt.value)};`;
+
+      case 'if_statement':
+        const condition = this.compileExpression(stmt.condition);
+        const thenBlock = this.compileBody(stmt.then);
+        const elseBlock = stmt.else ? `\n  } else {\n${this.compileBody(stmt.else)}` : '';
+        return `  if (${condition}) {\n${thenBlock}${elseBlock}\n  }`;
+
+      case 'return':
+        return `  return ${this.compileExpression(stmt.value)};`;
+
+      case 'await':
+        return `await ${this.compileExpression(stmt.expression)}`;
+
+      // ... more statement types
+    }
+  }
+
+  private compileExpression(expr: Expression): string {
+    if (typeof expr === 'string' && expr.startsWith('$ref:')) {
+      return this.resolveReference(expr);
+    }
+
+    if (expr.type === 'call_expression') {
+      const args = expr.args.map(a => this.compileExpression(a)).join(', ');
+      return `${expr.callee}(${args})`;
+    }
+
+    if (expr.type === 'template_literal') {
+      return `\`${expr.template}\``;
+    }
+
+    // ... more expression types
+  }
+
+  private resolveReference(ref: string): string {
+    // $ref:params.userId -> userId
+    // $ref:local.response -> response
+    // $ref:constants.API_BASE_URL -> API_BASE_URL
+    const parts = ref.replace('$ref:', '').split('.');
+    return parts[parts.length - 1];
+  }
+}
+```
+
+## Usage Example
+
+**Input**: `packages/shared/seed/script.json`
+
+**Compile**:
+```typescript
+const compiler = new ScriptCompiler(scriptSchema);
+const tsCode = compiler.compile();
+fs.writeFileSync('packages/shared/dist/index.ts', tsCode);
+```
+
+**Output**: `packages/shared/dist/index.ts`
+```typescript
+import { useState, useEffect, useCallback } from 'react';
+import axios from 'axios';
+
+export const API_BASE_URL = "https://api.example.com";
+export const MAX_RETRIES = 3;
+
+let cacheStore = new Map();
+
+export async function fetchUserData(userId: string, options?: object): Promise<User> {
+  const cacheKey = `user_${userId}`;
+
+  if (cacheStore.has(cacheKey)) {
+    return cacheStore.get(cacheKey);
+  }
+
+  try {
+    const response = await axios.get(`${API_BASE_URL}/users/${userId}`, options);
+    const userData = response.data;
+    cacheStore.set(cacheKey, userData);
+    return userData;
+  } catch (error) {
+    console.error("Failed to fetch user:", error);
+    throw error;
+  }
+}
+
+export async function retryWithBackoff<T>(
+  fn: () => Promise<T>,
+  maxRetries: number = MAX_RETRIES
+): Promise<T> {
+  for (const i = 0; i < maxRetries; i++) {
+    try {
+      return await fn();
+    } catch (error) {
+      if (i === maxRetries - 1) {
+        throw error;
+      }
+      await delay(1000 * Math.pow(2, i));
+    }
+  }
+}
+
+export function delay(ms: number): Promise<void> {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+export class ApiClient {
+  private baseUrl: string;
+  private timeout: number;
+
+  constructor(config: { baseUrl: string; timeout?: number }) {
+    this.baseUrl = config.baseUrl;
+    this.timeout = config.timeout ?? 5000;
+  }
+
+  async get<T>(endpoint: string): Promise<T> {
+    const url = `${this.baseUrl}${endpoint}`;
+    const response = await fetch(url, {
+      method: "GET",
+      signal: AbortSignal.timeout(this.timeout)
+    });
+    return await response.json();
+  }
+
+  async post<T, R>(endpoint: string, data: T): Promise<R> {
+    const url = `${this.baseUrl}${endpoint}`;
+    const response = await fetch(url, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(data)
+    });
+    return await response.json();
+  }
+}
+
+export function useFetch<T>(url: string) {
+  const [data, setData] = useState<T | null>(null);
+  const [loading, setLoading] = useState<boolean>(true);
+  const [error, setError] = useState<Error | null>(null);
+
+  useEffect(async () => {
+    try {
+      const response = await fetch(url);
+      const json = await response.json();
+      setData(json);
+    } catch (err) {
+      setError(err);
+    } finally {
+      setLoading(false);
+    }
+  }, [url]);
+
+  return { data, loading, error };
+}
+
+export function* range(start: number, end: number): Generator<number> {
+  for (let i = start; i <= end; i++) {
+    yield i;
+  }
+}
+```
+
+## Benefits
+
+### 1. **Visual Programming**
+Build a drag-and-drop editor where users create functions by connecting blocks.
+
+### 2. **Multi-Language Output**
+Same `script.json` → TypeScript, JavaScript, Python, Rust
+
+### 3. **AI-Friendly**
+LLMs can generate/modify JSON more reliably than raw code.
+
+### 4. **Static Analysis**
+Analyze control flow, detect dead code, optimize without parsing.
+
+### 5. **Runtime Flexibility**
+Interpret JSON directly without compilation (like a scripting engine).
+
+### 6. **Educational**
+Teach programming concepts with visual JSON representation.
+
+## Integration with Existing Patterns
+
+| Pattern | File | Purpose |
+|---------|------|---------|
+| **UI Components** | `components.json` | Component tree structure |
+| **Styling** | `styles.json` | CSS abstraction |
+| **Types** | `types.json` | TypeScript type definitions |
+| **Logic** | `script.json` | **Executable code** |
+
+Together, these define a **complete application** in pure JSON:
+```
+packages/my_app/seed/
+  ├── components.json   (What to render)
+  ├── styles.json       (How it looks)
+  ├── types.json        (Type system)
+  └── script.json       (How it behaves)
+```
+
+## Advanced Features
+
+### Composition
+```json
+{
+  "composition": [
+    {
+      "name": "enhancedFetch",
+      "base": "$ref:functions.fetchUserData",
+      "middleware": [
+        "$ref:functions.retryWithBackoff",
+        "$ref:functions.cacheWrapper"
+      ]
+    }
+  ]
+}
+```
+
+### Optimization Hints
+```json
+{
+  "functions": [
+    {
+      "name": "expensiveCalculation",
+      "memoize": true,
+      "pure": true,
+      "body": [...]
+    }
+  ]
+}
+```
+
+### Dependency Injection
+```json
+{
+  "dependencies": {
+    "logger": "$ref:services.logger",
+    "cache": "$ref:services.cache"
+  },
+  "functions": [
+    {
+      "name": "processData",
+      "inject": ["logger", "cache"],
+      "body": [...]
+    }
+  ]
+}
+```
+
+## Conclusion
+
+**script.json** demonstrates that **executable code is just data**. When properly abstracted:
+- Logic becomes composable
+- Non-developers can participate
+- AI can reason about behavior
+- Visual tools can edit functionality
+- Cross-language compilation is trivial
+
+This completes the abstraction trilogy:
+1. **styles.json** = Appearance as data
+2. **types.json** = Type system as data
+3. **script.json** = Behavior as data
+
+**Everything is JSON. Everything is composable. Everything is programmable.**
diff --git a/packages/css_designer/seed/metadata.json b/packages/css_designer/seed/metadata.json
index f4cbd7db1..07fac81b8 100644
--- a/packages/css_designer/seed/metadata.json
+++ b/packages/css_designer/seed/metadata.json
@@ -42,10 +42,16 @@
     "export/to_scss.lua",
     "export/to_css.lua"
   ],
-  "tests": [
-    "tests/colors.test.lua",
-    "tests/export.test.lua"
-  ],
+  "tests": {
+    "scripts": [
+      "tests/colors.test.lua",
+      "tests/export.test.lua"
+    ],
+    "cases": [
+      "tests/colors.cases.json",
+      "tests/export.cases.json"
+    ]
+  },
   "primary": true,
   "permissions": {
     "css.designer.export": {