bbf3c4ab17
resolve the promise for the added task immediately, instead of waiting on a promise for all tasks
36 lines
760 B
TypeScript
36 lines
760 B
TypeScript
export type AsyncCallback<T> = () => T
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type QueueItem = {
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callback: AsyncCallback<unknown>
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resolve: (value: unknown) => void
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reject: (error: unknown) => void
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}
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export class AsyncQueue {
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private items: QueueItem[] = []
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private running = false
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add<T>(callback: AsyncCallback<T>): Promise<Awaited<T>> {
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return new Promise((resolve, reject) => {
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this.items.push({ callback, resolve: resolve as any, reject })
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void this.runQueue()
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})
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}
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private async runQueue() {
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if (this.running) return
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this.running = true
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let item
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while ((item = this.items.shift())) {
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try {
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item.resolve(await item.callback())
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} catch (error) {
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item.reject(error)
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}
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}
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this.running = false
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}
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}
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