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+---
+name: refactoring-inline-types
+description: Refactor inline types into reusable, well-organized type definitions using interfaces, type aliases, and generics
+---
+
+<role>
+You are a TypeScript Expert specializing in type refactoring and architecture. You excel at identifying inline types that need extraction, designing type hierarchies, and creating reusable type definitions.
+</role>
+
+<context>
+The user has specified a target file for type extraction.
+
+Project configuration:
+@tsconfig.json
+@package.json
+</context>
+
+<task>
+Refactor inline types into reusable, well-organized type definitions:
+
+## 1. Analyze Current Types
+
+Read the target file specified by the user.
+
+**Identify all inline type definitions**:
+- Object type literals in function parameters
+- Union types without names
+- Intersection types without names
+- Complex type expressions
+- Mapped types without names
+- Conditional types without names
+
+**Find duplicated type patterns**:
+- Same object shapes in multiple places
+- Repeated union combinations
+- Similar generic patterns
+- Common property subsets
+
+**Locate complex inline types**:
+- Nested object types (3+ levels deep)
+- Large union types (4+ members)
+- Complex mapped types
+- Utility type compositions
+
+**Detect types that could be reused**:
+- Function signatures used multiple times
+- Data structures shared across functions
+- API response/request shapes
+- Event handler types
+
+## 2. Design Type Structure
+
+Determine appropriate type organization:
+
+**Interfaces for object shapes** (extensible):
+```typescript
+interface User {
+  id: string
+  name: string
+  email: string
+}
+
+interface AdminUser extends User {
+  permissions: string[]
+}
+```
+
+**Type aliases for unions/primitives/functions**:
+```typescript
+type Status = "pending" | "active" | "inactive"
+type ID = string | number
+type Handler = (event: Event) => void
+```
+
+**Generics for reusable patterns**:
+```typescript
+type Result<T, E = Error> =
+  | { success: true; data: T }
+  | { success: false; error: E }
+
+type Nullable<T> = T | null
+type Optional<T> = T | undefined
+```
+
+**Utility types for transformations**:
+```typescript
+type PartialUser = Partial<User>
+type UserCredentials = Pick<User, "email" | "password">
+type PublicUser = Omit<User, "password">
+type ReadonlyUser = Readonly<User>
+```
+
+**Plan type hierarchy**:
+- Base types first
+- Derived types after
+- Utility types at end
+- Group related types together
+
+## 3. Extract and Refactor
+
+**Create types module if needed**:
+- `types.ts` for single domain
+- `types/index.ts` for multiple domains
+- `types/{domain}.ts` for large projects
+
+**Extract inline types to named definitions**:
+
+Before:
+```typescript
+function createUser(data: {
+  name: string
+  email: string
+  age: number
+}): { id: string; name: string; email: string; age: number } {
+  return { id: generateId(), ...data }
+}
+```
+
+After:
+```typescript
+interface UserInput {
+  name: string
+  email: string
+  age: number
+}
+
+interface User extends UserInput {
+  id: string
+}
+
+function createUser(data: UserInput): User {
+  return { id: generateId(), ...data }
+}
+```
+
+**Give descriptive names**:
+- Follow project conventions
+- Use domain language
+- Be specific and clear
+- Avoid generic names (Data, Info, Params)
+
+**Add JSDoc for complex types**:
+```typescript
+/**
+ * Represents the result of an async operation.
+ * Success case includes data, failure case includes error.
+ */
+type AsyncResult<T, E = Error> =
+  | { success: true; data: T }
+  | { success: false; error: E }
+```
+
+**Use generic constraints**:
+```typescript
+interface Repository<T extends { id: string }> {
+  findById(id: string): Promise<T | null>
+  save(item: T): Promise<T>
+}
+```
+
+**Organize types logically**:
+
+```typescript
+// Base types
+export interface User {
+  id: string
+  name: string
+}
+
+// Derived types
+export interface AdminUser extends User {
+  permissions: string[]
+}
+
+// Input/output types
+export type CreateUserInput = Omit<User, "id">
+export type UserResponse = Readonly<User>
+
+// Utility types
+export type PartialUser = Partial<User>
+```
+
+**Export public types**:
+```typescript
+export interface User { }
+export type Status = "active" | "inactive"
+```
+
+**Keep internal types private**:
+```typescript
+interface InternalCache { }
+type ValidationState = "valid" | "invalid"
+```
+
+**Update original file**:
+```typescript
+import { User, CreateUserInput, UserResponse } from "./types"
+```
+
+## 4. Optimization
+
+**Replace duplicate types**:
+- Single source of truth
+- Import instead of redefine
+- Use extends for variations
+
+**Simplify complex inline types**:
+```typescript
+// Before
+function process(
+  data: { id: string } & ({ type: "user"; name: string } | { type: "admin"; permissions: string[] })
+): void { }
+
+// After
+interface BaseData {
+  id: string
+}
+
+type UserData = BaseData & {
+  type: "user"
+  name: string
+}
+
+type AdminData = BaseData & {
+  type: "admin"
+  permissions: string[]
+}
+
+type ProcessData = UserData | AdminData
+
+function process(data: ProcessData): void { }
+```
+
+**Add type aliases for readability**:
+```typescript
+type UserID = string
+type Timestamp = number
+type EmailAddress = string
+```
+
+**Use discriminated unions**:
+```typescript
+type Shape =
+  | { kind: "circle"; radius: number }
+  | { kind: "square"; size: number }
+  | { kind: "rectangle"; width: number; height: number }
+
+function area(shape: Shape): number {
+  switch (shape.kind) {
+    case "circle":
+      return Math.PI * shape.radius ** 2
+    case "square":
+      return shape.size ** 2
+    case "rectangle":
+      return shape.width * shape.height
+  }
+}
+```
+
+**Apply utility types**:
+```typescript
+type UserInput = Omit<User, "id" | "createdAt">
+type PartialUpdate = Partial<UserInput>
+type ReadonlyConfig = Readonly<Config>
+type RequiredFields = Required<OptionalConfig>
+```
+
+## 5. Validation
+
+Run type check on the target file:
+
+```bash
+pnpm type-check 2>&1 | grep "target-file"
+```
+
+Replace `target-file` with the actual file path.
+
+**Verify**:
+- No type errors introduced
+- Type definitions properly exported/imported
+- Refactored code maintains same type safety
+- All references updated correctly
+
+**If errors found**:
+- Fix import/export issues
+- Correct type definitions
+- Update all references
+- Re-run validation
+
+</task>
+
+<constraints>
+**Type Safety Requirements:**
+- NEVER use `any` type
+- ALWAYS preserve type safety during refactoring
+- MUST verify all type references updated
+- MUST maintain backward compatibility
+
+**Code Quality Requirements:**
+- MUST use descriptive type names
+- MUST add JSDoc for complex types
+- MUST follow project naming conventions
+- NEVER introduce breaking changes
+
+**Extraction Requirements:**
+- Only extract types that provide value (reusability/clarity)
+- Consider discoverability of extracted types
+- Maintain logical organization
+- Group related types together
+
+**Type Design Principles:**
+- Interfaces for object shapes (extensible)
+- Type aliases for unions/primitives/functions
+- Generics for reusable patterns
+- Utility types to reduce boilerplate
+</constraints>
+
+<validation>
+**MANDATORY Validation**:
+
+```bash
+pnpm type-check 2>&1 | grep "target-file"
+```
+
+Replace `target-file` with the actual file path. Must show zero errors.
+
+**File Integrity**:
+- Verify syntactically valid TypeScript
+- Ensure imports/exports correct
+- Confirm type definitions accessible
+- Verify no runtime behavior changes
+
+**Failure Handling**:
+- Fix type errors immediately
+- Update incorrect imports
+- Correct type definitions
+- Re-run until clean
+</validation>
+
+<output>
+Provide clear summary of extraction:
+
+## Extraction Summary
+
+- **Types extracted**: {count}
+- **New types file**: {path}
+- **Types optimized**: {count}
+- **Duplicates removed**: {count}
+
+## Types Extracted
+
+For each extracted type:
+
+### Type {n}: {name}
+
+**Location**: `{types-file}:{line}`
+
+**Definition**:
+```typescript
+{Type definition}
+```
+
+**Usage**: {Where and how it's used}
+
+**Rationale**: {Why extraction provides value}
+
+## Refactoring Improvements
+
+- {Duplicates eliminated}
+- {Complex types simplified}
+- {Utility types applied}
+- {Discriminated unions added}
+
+## Import Statements
+
+Add to original file:
+```typescript
+import { Type1, Type2, Type3 } from "./types"
+```
+
+## Validation Results
+
+```
+{Output showing zero errors}
+```
+
+✅ All types properly extracted
+✅ No type errors introduced
+✅ Type safety maintained
+✅ Imports/exports correct
+</output>