| 7 | * that second promise will also be awaited. |
| 8 | */ |
| 9 | export class AwaiterMulti { |
| 10 | private promises: Set<Promise<unknown>> = new Set() |
| 11 | private onError: (error: unknown) => void |
| 12 | |
| 13 | constructor({ onError }: { onError?: (error: unknown) => void } = {}) { |
| 14 | this.onError = onError ?? console.error |
| 15 | } |
| 16 | |
| 17 | public waitUntil = (promise: Promise<unknown>): void => { |
| 18 | // if a promise settles before we await it, we should drop it -- |
| 19 | // storing them indefinitely could result in a memory leak. |
| 20 | const cleanup = () => { |
| 21 | this.promises.delete(promise) |
| 22 | } |
| 23 | |
| 24 | promise.then(cleanup, (err) => { |
| 25 | cleanup() |
| 26 | this.onError(err) |
| 27 | }) |
| 28 | |
| 29 | this.promises.add(promise) |
| 30 | } |
| 31 | |
| 32 | public async awaiting(): Promise<void> { |
| 33 | while (this.promises.size > 0) { |
| 34 | const promises = Array.from(this.promises) |
| 35 | this.promises.clear() |
| 36 | await Promise.allSettled(promises) |
| 37 | } |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Like {@link AwaiterMulti}, but can only be awaited once. |