64 lines
1.4 KiB
JavaScript
64 lines
1.4 KiB
JavaScript
export class TimeoutError extends Error {
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constructor(message) {
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super(message);
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this.name = 'TimeoutError';
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}
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}
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export default function pTimeout(promise, milliseconds, fallback, options) {
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let timer;
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const cancelablePromise = new Promise((resolve, reject) => {
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if (typeof milliseconds !== 'number' || Math.sign(milliseconds) !== 1) {
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throw new TypeError(`Expected \`milliseconds\` to be a positive number, got \`${milliseconds}\``);
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}
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if (milliseconds === Number.POSITIVE_INFINITY) {
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resolve(promise);
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return;
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}
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options = {
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customTimers: {setTimeout, clearTimeout},
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...options
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};
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timer = options.customTimers.setTimeout.call(undefined, () => {
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if (typeof fallback === 'function') {
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try {
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resolve(fallback());
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} catch (error) {
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reject(error);
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}
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return;
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}
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const message = typeof fallback === 'string' ? fallback : `Promise timed out after ${milliseconds} milliseconds`;
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const timeoutError = fallback instanceof Error ? fallback : new TimeoutError(message);
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if (typeof promise.cancel === 'function') {
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promise.cancel();
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}
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reject(timeoutError);
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}, milliseconds);
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(async () => {
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try {
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resolve(await promise);
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} catch (error) {
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reject(error);
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} finally {
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options.customTimers.clearTimeout.call(undefined, timer);
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}
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})();
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});
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cancelablePromise.clear = () => {
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clearTimeout(timer);
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timer = undefined;
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};
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return cancelablePromise;
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}
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