chore: add example 2

Author: chrisbbreuer

fixtures/input/example-0002.ts

@@ -0,0 +1,215 @@
+/**
+ * Extended test cases for DTS generation
+ */
+
+// 1. Complex Generic Types
+export interface ComplexGeneric<T extends Record<string, unknown>, K extends keyof T> {
+  data: T
+  key: K
+  value: T[K]
+  transform: (input: T[K]) => string
+  nested: Array<Partial<T>>
+}
+
+// 2. Intersection and Union Types
+export type ComplexUnionIntersection =
+  | (User & { role: 'admin' })
+  | (Product & { category: string })
+  & {
+    metadata: Record<string, unknown>
+  }
+
+// 3. Mapped and Conditional Types
+export type ReadonlyDeep<T> = {
+  readonly [P in keyof T]: T[P] extends object ? ReadonlyDeep<T[P]> : T[P]
+}
+
+export type ConditionalResponse<T> = T extends Array<infer U>
+  ? ApiResponse<U[]>
+  : T extends object
+    ? ApiResponse<T>
+    : ApiResponse<string>
+
+// 4. Complex Function Overloads
+export function processData(data: string): string
+export function processData(data: number): number
+export function processData(data: boolean): boolean
+export function processData<T extends object>(data: T): T
+export function processData(data: unknown): unknown {
+  return data
+}
+
+// 5. Nested Object Types with Methods
+export const complexObject = {
+  handlers: {
+    async onSuccess<T>(data: T): Promise<void> {
+      console.log(data)
+    },
+    onError(error: Error & { code?: number }): never {
+      throw error
+    }
+  },
+  utils: {
+    formatters: {
+      date: (input: Date) => input.toISOString(),
+      currency: (amount: number, currency = 'USD') =>
+        new Intl.NumberFormat('en-US', { style: 'currency', currency }).format(amount)
+    }
+  }
+}
+
+// 6. Template Literal Types
+export type EventType = 'click' | 'focus' | 'blur'
+export type ElementType = 'button' | 'input' | 'form'
+export type EventHandler = `on${Capitalize<EventType>}${Capitalize<ElementType>}`
+
+// 7. Recursive Types
+export type RecursiveObject = {
+  id: string
+  children?: RecursiveObject[]
+  parent?: RecursiveObject
+  metadata: Record<string, unknown>
+}
+
+// 8. Complex Array Types
+export const complexArrays = {
+  matrix: [
+    [1, 2, [3, 4, [5, 6]]],
+    ['a', 'b', ['c', 'd']],
+    [true, [false, [true]]],
+  ],
+  tuples: [
+    [1, 'string', true] as const,
+    ['literal', 42, false] as const,
+  ],
+  mixedArrays: [
+    new Date(),
+    Promise.resolve('async'),
+    async () => 'result',
+    function* generator() { yield 42 },
+  ]
+}
+
+// 9. Default Type Parameters
+export interface DefaultGeneric<
+  T = string,
+  K extends keyof any = string,
+  V extends Record<K, T> = Record<K, T>
+> {
+  key: K
+  value: T
+  record: V
+}
+
+// 10. Method Decorators and Metadata
+export const methodDecorator = (
+  target: any,
+  propertyKey: string,
+  descriptor: PropertyDescriptor
+) => {
+  return {
+    ...descriptor,
+    enumerable: true,
+  }
+}
+
+// 11. Complex Async Patterns
+export async function* complexAsyncGenerator() {
+  const results = await Promise.all([
+    fetchUsers(),
+    getProduct(1),
+    authenticate('user', 'pass'),
+  ])
+
+  for (const result of results) {
+    yield result
+  }
+}
+
+// 12. Type Assertions and Guards
+export function isUser(value: unknown): value is User {
+  return (
+    typeof value === 'object'
+    && value !== null
+    && 'id' in value
+    && 'email' in value
+  )
+}
+
+// 13. Branded Types
+export type UserId = string & { readonly __brand: unique symbol }
+export type ProductId = number & { readonly __brand: unique symbol }
+
+// 14. Complex Error Handling
+export class CustomError extends Error {
+  constructor(
+    message: string,
+    public readonly code: number,
+    public readonly metadata: Record<string, unknown>
+  ) {
+    super(message)
+    this.name = 'CustomError'
+  }
+}
+
+// 15. Module Augmentation
+declare module '@stacksjs/dtsx' {
+  interface DtsGenerationConfig {
+    customPlugins?: Array<{
+      name: string
+      transform: (code: string) => string
+    }>
+  }
+}
+
+// 16. Utility Type Implementations
+export type DeepPartial<T> = T extends object ? {
+  [P in keyof T]?: DeepPartial<T[P]>
+} : T
+
+export type DeepRequired<T> = T extends object ? {
+  [P in keyof T]-?: DeepRequired<T[P]>
+} : T
+
+// 17. Complex Constants with Type Inference
+export const CONFIG_MAP = {
+  development: {
+    features: {
+      auth: {
+        providers: ['google', 'github'] as const,
+        settings: { timeout: 5000, retries: 3 }
+      }
+    }
+  },
+  production: {
+    features: {
+      auth: {
+        providers: ['google', 'github', 'microsoft'] as const,
+        settings: { timeout: 3000, retries: 5 }
+      }
+    }
+  }
+} as const
+
+// 18. Polymorphic Types
+export type PolymorphicComponent<P = {}> = {
+  <C extends React.ElementType>(
+    props: { as?: C } & Omit<React.ComponentPropsWithRef<C>, keyof P> & P
+  ): React.ReactElement | null
+}
+
+// 19. Type Inference in Functions
+export function createApi<T extends Record<string, (...args: any[]) => any>>(
+  endpoints: T
+): { [K in keyof T]: ReturnType<T[K]> extends Promise<infer R> ? R : ReturnType<T[K]> } {
+  return {} as any
+}
+
+// 20. Complex Index Types
+export type DynamicRecord<K extends PropertyKey> = {
+  [P in K]: P extends number
+    ? Array<unknown>
+    : P extends string
+      ? Record<string, unknown>
+      : never
+}