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71 lines
1.8 KiB
Plaintext
71 lines
1.8 KiB
Plaintext
import type { AbortSignalWithReason } from './types'
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export const assertFunction: (
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func: unknown,
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expected: string,
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) => asserts func is (...args: unknown[]) => unknown = (
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func: unknown,
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expected: string,
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) => {
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if (typeof func !== 'function') {
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throw new TypeError(`${expected} is not a function`)
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}
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}
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export const noop = () => {}
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export const catchRejection = <T>(
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promise: Promise<T>,
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onError = noop,
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): Promise<T> => {
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promise.catch(onError)
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return promise
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}
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export const addAbortSignalListener = (
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abortSignal: AbortSignal,
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callback: (evt: Event) => void,
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) => {
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abortSignal.addEventListener('abort', callback, { once: true })
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return () => abortSignal.removeEventListener('abort', callback)
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}
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/**
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* Calls `abortController.abort(reason)` and patches `signal.reason`.
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* if it is not supported.
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*
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* At the time of writing `signal.reason` is available in FF chrome, edge node 17 and deno.
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* @param abortController
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* @param reason
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* @returns
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* @see https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/reason
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*/
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export const abortControllerWithReason = <T>(
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abortController: AbortController,
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reason: T,
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): void => {
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type Consumer<T> = (val: T) => void
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const signal = abortController.signal as AbortSignalWithReason<T>
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if (signal.aborted) {
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return
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}
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// Patch `reason` if necessary.
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// - We use defineProperty here because reason is a getter of `AbortSignal.__proto__`.
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// - We need to patch 'reason' before calling `.abort()` because listeners to the 'abort'
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// event are are notified immediately.
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if (!('reason' in signal)) {
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Object.defineProperty(signal, 'reason', {
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enumerable: true,
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value: reason,
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configurable: true,
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writable: true,
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})
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}
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;(abortController.abort as Consumer<typeof reason>)(reason)
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}
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