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+# TypeScript JSON Abstraction Pattern
+
+## Concept Overview
+
+Just as we've abstracted CSS into declarative JSON schemas (`styles.json`), this demonstrates how TypeScript type definitions can be represented in a similar JSON format.
+
+## Pattern Comparison
+
+### CSS Pattern (styles.json V2)
+```
+Declarative JSON → StylesCompiler → CSS Output
+```
+
+### TypeScript Pattern (types.json)
+```
+Declarative JSON → TypeScriptCompiler → .d.ts Output
+```
+
+## Architecture
+
+### 1. Schema Structure
+
+**File Location**: `packages/{package}/seed/types.json`
+
+**Core Sections**:
+- **tokens**: Reusable primitive type aliases
+- **interfaces**: Object type definitions
+- **types**: Union types, literal types
+- **generics**: Generic type definitions
+- **rules**: Type constraints and modifiers
+- **exports**: Export configuration
+- **environments**: Target environments (ESM, CJS, TypeScript)
+- **composition**: Type intersections and combinations
+
+### 2. Benefits of This Approach
+
+1. **Non-Developer Friendly**: JSON is easier to read/edit than TypeScript syntax
+2. **Composable**: Build complex types from simple building blocks
+3. **Multi-Target**: Single source generates multiple output formats
+4. **Versionable**: Schema versioning allows evolution
+5. **Debuggable**: Can build visualization tools (like StylesPanel)
+6. **Consistent**: Mirrors the proven styles.json pattern
+
+### 3. Example: From JSON to TypeScript
+
+**Input** (`types.json`):
+```json
+{
+  "interfaces": [
+    {
+      "name": "ButtonProps",
+      "extends": ["BaseComponentProps"],
+      "properties": {
+        "variant": {
+          "type": "'primary' | 'secondary'",
+          "optional": false
+        },
+        "size": {
+          "type": "'small' | 'medium' | 'large'",
+          "default": "'medium'"
+        }
+      }
+    }
+  ]
+}
+```
+
+**Output** (compiled TypeScript):
+```typescript
+export interface ButtonProps extends BaseComponentProps {
+  variant: 'primary' | 'secondary';
+  size?: 'small' | 'medium' | 'large';
+}
+```
+
+### 4. Compiler Implementation Sketch
+
+```typescript
+class TypeScriptCompiler {
+  private schema: TypeScriptSchema;
+
+  compile(): string {
+    const output: string[] = [];
+
+    // Compile tokens
+    if (this.schema.tokens) {
+      output.push(this.compileTokens(this.schema.tokens));
+    }
+
+    // Compile interfaces
+    if (this.schema.interfaces) {
+      output.push(...this.schema.interfaces.map(i => this.compileInterface(i)));
+    }
+
+    // Compile types
+    if (this.schema.types) {
+      output.push(...this.schema.types.map(t => this.compileType(t)));
+    }
+
+    // Apply rules/modifiers
+    return this.applyRules(output.join('\n\n'));
+  }
+
+  private compileInterface(def: InterfaceDefinition): string {
+    const ext = def.extends?.length ? ` extends ${def.extends.join(', ')}` : '';
+    const props = Object.entries(def.properties)
+      .map(([key, prop]) => {
+        const optional = prop.optional ? '?' : '';
+        const readonly = prop.readonly ? 'readonly ' : '';
+        return `  ${readonly}${key}${optional}: ${prop.type};`;
+      })
+      .join('\n');
+
+    return `export interface ${def.name}${ext} {\n${props}\n}`;
+  }
+
+  private compileType(def: TypeDefinition): string {
+    if (def.kind === 'union') {
+      return `export type ${def.name} = ${def.values.join(' | ')};`;
+    }
+    return `export type ${def.name} = ${def.definition};`;
+  }
+}
+```
+
+### 5. Integration Points
+
+Following the styles.json pattern:
+
+```typescript
+// Similar to loadPackageStyles()
+async function loadPackageTypes(packageId: string): Promise<string> {
+  const response = await fetch(`/packages/${packageId}/seed/types.json`);
+  const schema = await response.json();
+
+  const compiler = new TypeScriptCompiler(schema);
+  return compiler.compile();
+}
+
+// Generate .d.ts files at build time
+function generateTypeDefinitions() {
+  const packages = getPackageList();
+
+  for (const pkg of packages) {
+    const typeSchema = loadTypeSchema(pkg);
+    const compiler = new TypeScriptCompiler(typeSchema);
+    const output = compiler.compile();
+
+    fs.writeFileSync(
+      `packages/${pkg}/dist/types.d.ts`,
+      output
+    );
+  }
+}
+```
+
+### 6. Advanced Features
+
+**Composition** (like styles.json appearance layers):
+```json
+{
+  "composition": [
+    {
+      "name": "EnhancedButtonProps",
+      "kind": "intersection",
+      "types": [
+        "ButtonProps",
+        "AccessibilityProps",
+        "AnalyticsProps"
+      ]
+    }
+  ]
+}
+```
+
+**Rules** (like styles.json selector rules):
+```json
+{
+  "rules": [
+    {
+      "selector": {
+        "interfaceName": "UserData",
+        "property": "id"
+      },
+      "modifiers": ["readonly", "required"],
+      "priority": 10
+    }
+  ]
+}
+```
+
+**Environments** (like styles.json responsive environments):
+```json
+{
+  "environments": {
+    "node": {
+      "moduleSystem": "CommonJS",
+      "globals": ["process", "Buffer"]
+    },
+    "browser": {
+      "moduleSystem": "ES2015",
+      "globals": ["window", "document"]
+    }
+  }
+}
+```
+
+### 7. Practical Use Cases
+
+1. **Component Libraries**: Define all component prop types in JSON
+2. **API Contracts**: Generate TypeScript types from API schemas
+3. **Configuration**: Type-safe config objects defined declaratively
+4. **Theme Systems**: Type definitions for theme tokens and variants
+5. **State Management**: Action and state type definitions
+
+### 8. Future Enhancements
+
+- **Validation**: JSON Schema validation for types.json
+- **Visualization**: Storybook panel to explore type relationships (like StylesPanel)
+- **Code Generation**: Generate not just types but implementation stubs
+- **Documentation**: Auto-generate docs from type definitions
+- **Migration Tools**: Convert existing .ts files to types.json
+
+## Example Files
+
+See the demonstration in:
+- [packages/shared/seed/types.json](packages/shared/seed/types.json)
+
+This mirrors the existing pattern:
+- [packages/shared/seed/styles.json](packages/shared/seed/styles.json)
+
+## Conclusion
+
+This pattern demonstrates that **any code abstraction can be represented declaratively in JSON** when you:
+1. Define a clear schema
+2. Build a compiler to transform it
+3. Support composition and rules
+4. Enable multi-target output
+5. Provide tooling for debugging/visualization
+
+The same pattern used for CSS → styles.json applies perfectly to TypeScript → types.json.
diff --git a/packages/shared/seed/types.json b/packages/shared/seed/types.json
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+{
+  "schema_version": "1.0.0",
+  "package": "shared",
+  "description": "Type definitions abstraction - similar pattern to styles.json V2",
+
+  "tokens": {
+    "primitives": {
+      "StringType": "string",
+      "NumberType": "number",
+      "BooleanType": "boolean",
+      "VoidType": "void",
+      "UnknownType": "unknown",
+      "NeverType": "never"
+    },
+    "common": {
+      "ID": "string",
+      "Timestamp": "number",
+      "JSONValue": "string | number | boolean | null | JSONArray | JSONObject",
+      "Callback": "(event: any) => void",
+      "AsyncCallback": "(event: any) => Promise<void>"
+    }
+  },
+
+  "interfaces": [
+    {
+      "id": "base_component_props",
+      "name": "BaseComponentProps",
+      "description": "Base props for all components",
+      "extends": [],
+      "properties": {
+        "id": {
+          "type": "string",
+          "optional": true,
+          "description": "Unique identifier"
+        },
+        "className": {
+          "type": "string",
+          "optional": true,
+          "description": "CSS class name"
+        },
+        "style": {
+          "type": "React.CSSProperties",
+          "optional": true,
+          "description": "Inline styles"
+        },
+        "children": {
+          "type": "React.ReactNode",
+          "optional": true,
+          "description": "Child elements"
+        }
+      }
+    },
+    {
+      "id": "theme_config",
+      "name": "ThemeConfig",
+      "description": "Theme configuration object",
+      "properties": {
+        "mode": {
+          "type": "'light' | 'dark'",
+          "optional": false,
+          "default": "'light'"
+        },
+        "primaryColor": {
+          "type": "string",
+          "optional": true,
+          "description": "Primary theme color"
+        },
+        "spacing": {
+          "type": "number",
+          "optional": true,
+          "default": 8,
+          "description": "Base spacing unit in pixels"
+        }
+      }
+    }
+  ],
+
+  "types": [
+    {
+      "id": "component_type_enum",
+      "name": "ComponentType",
+      "kind": "union",
+      "values": [
+        "'div'",
+        "'span'",
+        "'button'",
+        "'input'",
+        "'section'",
+        "'header'",
+        "'footer'"
+      ]
+    },
+    {
+      "id": "size_variant",
+      "name": "SizeVariant",
+      "kind": "union",
+      "values": ["'small'", "'medium'", "'large'"]
+    },
+    {
+      "id": "color_variant",
+      "name": "ColorVariant",
+      "kind": "union",
+      "values": ["'primary'", "'secondary'", "'success'", "'error'", "'warning'"]
+    }
+  ],
+
+  "generics": [
+    {
+      "id": "generic_props",
+      "name": "PropsWithType",
+      "typeParams": ["T"],
+      "definition": "BaseComponentProps & { type: T }"
+    },
+    {
+      "id": "generic_state",
+      "name": "StateWithData",
+      "typeParams": ["D"],
+      "definition": "{ loading: boolean; error?: string; data?: D }"
+    }
+  ],
+
+  "rules": [
+    {
+      "id": "readonly_id_rule",
+      "selector": {
+        "interfaceName": "BaseComponentProps",
+        "property": "id"
+      },
+      "modifiers": ["readonly"],
+      "enabled": true,
+      "priority": 10
+    },
+    {
+      "id": "required_theme_mode",
+      "selector": {
+        "interfaceName": "ThemeConfig",
+        "property": "mode"
+      },
+      "modifiers": ["required"],
+      "enabled": true,
+      "priority": 20
+    }
+  ],
+
+  "exports": [
+    {
+      "id": "export_base_props",
+      "name": "BaseComponentProps",
+      "kind": "interface",
+      "environments": ["esm", "cjs", "types"],
+      "default": false
+    },
+    {
+      "id": "export_theme_config",
+      "name": "ThemeConfig",
+      "kind": "interface",
+      "environments": ["esm", "cjs", "types"],
+      "default": false
+    },
+    {
+      "id": "export_component_type",
+      "name": "ComponentType",
+      "kind": "type",
+      "environments": ["esm", "cjs", "types"],
+      "default": false
+    },
+    {
+      "id": "export_size_variant",
+      "name": "SizeVariant",
+      "kind": "type",
+      "environments": ["esm", "cjs", "types"],
+      "default": false
+    }
+  ],
+
+  "environments": {
+    "esm": {
+      "moduleSystem": "ES2015",
+      "target": "ES2020"
+    },
+    "cjs": {
+      "moduleSystem": "CommonJS",
+      "target": "ES2015"
+    },
+    "types": {
+      "moduleSystem": "ES2015",
+      "target": "ESNext",
+      "declarationOnly": true
+    }
+  },
+
+  "composition": [
+    {
+      "id": "button_props_composition",
+      "name": "ButtonProps",
+      "kind": "intersection",
+      "types": [
+        "BaseComponentProps",
+        {
+          "size": "SizeVariant",
+          "variant": "ColorVariant",
+          "disabled": "boolean",
+          "onClick": "Callback"
+        }
+      ]
+    }
+  ]
+}