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iterable.ts
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/
iterable.ts
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import type { FixedPromise } from './promise'
/** Item of Iterable or AsyncIterable */
export type UniversalIterableItem<T extends Iterable<unknown> | AsyncIterable<unknown>> =
T extends Iterable<infer U> ? U : T extends AsyncIterable<infer U> ? Awaited<U> : never
/** Item of Iterable */
export type IterableItem<T extends Iterable<unknown>> = T extends Iterable<infer U> ? U : never
/** Item of AsyncIterable */
export type AsyncIterableItem<T extends AsyncIterable<unknown>> = T extends AsyncIterable<infer U> ? Awaited<U> : never
/** T is AsyncIterable ? FixedPromise<R> : R */
export type IterableReturnValue<T extends UniversalIterable, R = UniversalIterableItem<T>> =
T extends AsyncIterable<unknown> ? FixedPromise<R> : T extends Iterable<unknown> ? R : never
/** Iterator or AsyncIterator */
export type UniversalIterator<T = unknown> = Iterator<T> | AsyncIterator<T>
/** Iterable or AsyncIterable */
export type UniversalIterable<T = unknown> = Iterable<T> | AsyncIterable<T>
/** Iterator or AsyncIterator or Iterable or AsyncIterable */
export type Iter<T> = UniversalIterator<T> | UniversalIterable<T>
/** T is async(AsyncIterable) ? AsyncIterableIterator<Awaited<R>> : IterableIterator<R> */
export type IteratorReturnValue<T extends UniversalIterable, R = UniversalIterableItem<T>> =
T extends Iterable<unknown>
? IterableIterator<R>
: T extends AsyncIterable<unknown>
? AsyncIterableIterator<Awaited<R>>
: never