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fix: update deps + async iterator factory
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| import {bind} from "../decorator"; | ||
| import {isUndefined} from "../is"; | ||
| import {AsyncPushPull} from "./AsyncPushPull"; | ||
|
|
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| type AsyncIteratorFactoryFunction<T> = { | ||
| ( | ||
| push: (value: T) => void, | ||
| reject: (reason: unknown) => void, | ||
| on: (dispose: () => Promise<void>) => void, | ||
| ): Promise<void>; | ||
| }; | ||
|
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| export class AsyncIteratorFactory<T> implements AsyncIterable<T> { | ||
| readonly #pool: AsyncPushPull<T>; | ||
| readonly #disposable: {(): void}[] = []; | ||
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| constructor(factory: AsyncIteratorFactoryFunction<T>) { | ||
| this.#pool = new AsyncPushPull(); | ||
| factory( | ||
| (value) => this.#pool.push(value), | ||
| (reason) => this.#pool.reject(reason), | ||
| (dispose) => this.#disposable.push(dispose), | ||
| ) | ||
| .catch(this.reject); | ||
| } | ||
|
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| public reject(reason: unknown): void { | ||
| this.#pool.reject(reason); | ||
| } | ||
|
|
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| public [Symbol.asyncIterator](): AsyncIterator<T> { | ||
| return { | ||
| next: async (): Promise<IteratorResult<T>> => { | ||
| return this.#pool.pull() | ||
| .then(this.asResult); | ||
| }, | ||
| return: async (value?: T | PromiseLike<T>): Promise<IteratorResult<T>> => { | ||
| await this.dispose(); | ||
|
|
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| return Promise.resolve(value) | ||
| .then(this.asResult); | ||
| }, | ||
| throw: async (e): Promise<IteratorResult<T>> => { | ||
| await this.dispose(); | ||
|
|
||
| return Promise.reject(e); | ||
| }, | ||
| }; | ||
| } | ||
|
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| public getAsyncIterator(): AsyncIterator<T> { | ||
| return this[Symbol.asyncIterator](); | ||
| } | ||
|
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| public async dispose(): Promise<void> { | ||
| const pending = this.#disposable.map((fn) => Promise.resolve(fn())); | ||
|
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| return Promise | ||
| .all(pending) | ||
| .then(() => void 0); | ||
| } | ||
|
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| @bind | ||
| private asResult(value?: T): IteratorResult<T> { | ||
| return isUndefined(value) ? {value, done: true} : {value, done: false}; | ||
| } | ||
| } |
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