256 lines
7.1 KiB
TypeScript
256 lines
7.1 KiB
TypeScript
export class AbortError extends Error {
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readonly name: 'AbortError';
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readonly originalError: Error;
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/**
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Abort retrying and reject the promise. No callback functions will be called.
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@param message - An error message or a custom error.
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*/
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constructor(message: string | Error);
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}
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export type RetryContext = {
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readonly error: Error;
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readonly attemptNumber: number;
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readonly retriesLeft: number;
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readonly retriesConsumed: number;
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};
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export type Options = {
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/**
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Callback invoked on each failure. Receives a context object containing the error and retry state information.
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The function is called before `shouldConsumeRetry` and `shouldRetry`, for all errors except `AbortError`.
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The function is not called on `AbortError`.
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@example
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```
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import pRetry from 'p-retry';
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const run = async () => {
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const response = await fetch('https://sindresorhus.com/unicorn');
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if (!response.ok) {
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throw new Error(response.statusText);
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}
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return response.json();
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};
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const result = await pRetry(run, {
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onFailedAttempt: ({error, attemptNumber, retriesLeft, retriesConsumed}) => {
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console.log(`Attempt ${attemptNumber} failed. ${retriesLeft} retries left. ${retriesConsumed} retries consumed.`);
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// 1st request => Attempt 1 failed. 5 retries left. 0 retries consumed.
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// 2nd request => Attempt 2 failed. 4 retries left. 1 retries consumed.
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// …
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},
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retries: 5
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});
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console.log(result);
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```
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The `onFailedAttempt` function can return a promise. For example, to add a [delay](https://github.com/sindresorhus/delay):
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@example
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```
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import pRetry from 'p-retry';
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import delay from 'delay';
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const run = async () => { … };
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const result = await pRetry(run, {
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onFailedAttempt: async () => {
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console.log('Waiting for 1 second before retrying');
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await delay(1000);
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}
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});
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```
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If the `onFailedAttempt` function throws, all retries will be aborted and the original promise will reject with the thrown error.
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*/
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readonly onFailedAttempt?: (context: RetryContext) => void | Promise<void>;
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/**
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Decide if a retry should occur based on the context. Returning true triggers a retry, false aborts with the error.
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The function is called after `onFailedAttempt` and `shouldConsumeRetry`.
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The function is not called on `AbortError`, `TypeError` (except network errors), or if `retries` or `maxRetryTime` are exhausted.
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@example
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```
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import pRetry from 'p-retry';
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const run = async () => { … };
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const result = await pRetry(run, {
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shouldRetry: ({error, attemptNumber, retriesLeft}) => !(error instanceof CustomError)
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});
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```
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In the example above, the operation will be retried unless the error is an instance of `CustomError`.
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If the `shouldRetry` function throws, all retries will be aborted and the original promise will reject with the thrown error.
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*/
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readonly shouldRetry?: (context: RetryContext) => boolean | Promise<boolean>;
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/**
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Decide if this failure should consume a retry from the `retries` budget.
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When `false` is returned, the failure will not consume a retry or increment backoff values, but is still subject to `maxRetryTime`.
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The function is called after `onFailedAttempt`, but before `shouldRetry`.
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The function is not called on `AbortError`.
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@example
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```
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import pRetry from 'p-retry';
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const run = async () => { … };
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const result = await pRetry(run, {
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retries: 2,
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shouldConsumeRetry: ({error, retriesLeft}) => {
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console.log(`Retries left: ${retriesLeft}`);
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return !(error instanceof RateLimitError);
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},
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});
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```
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In the example above, `RateLimitError`s will not decrement the available `retries`.
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If the `shouldConsumeRetry` function throws, all retries will be aborted and the original promise will reject with the thrown error.
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*/
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readonly shouldConsumeRetry?: (context: RetryContext) => boolean | Promise<boolean>;
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/**
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The maximum amount of times to retry the operation.
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@default 10
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*/
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readonly retries?: number;
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/**
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The exponential factor to use.
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@default 2
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*/
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readonly factor?: number;
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/**
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The number of milliseconds before starting the first retry.
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Set this to `0` to retry immediately with no delay.
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@default 1000
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*/
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readonly minTimeout?: number;
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/**
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The maximum number of milliseconds between two retries.
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@default Infinity
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*/
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readonly maxTimeout?: number;
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/**
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Randomizes the timeouts by multiplying with a factor between 1 and 2.
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@default false
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*/
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readonly randomize?: boolean;
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/**
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The maximum time (in milliseconds) that the retried operation is allowed to run.
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@default Infinity
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Measured with a monotonic clock (`performance.now()`) so system clock adjustments do not affect the limit.
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*/
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readonly maxRetryTime?: number;
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/**
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You can abort retrying using [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController).
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```
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import pRetry from 'p-retry';
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const run = async () => { … };
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const controller = new AbortController();
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cancelButton.addEventListener('click', () => {
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controller.abort(new Error('User clicked cancel button'));
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});
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try {
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await pRetry(run, {signal: controller.signal});
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} catch (error) {
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console.log(error.message);
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//=> 'User clicked cancel button'
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}
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```
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*/
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readonly signal?: AbortSignal | undefined;
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/**
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Prevents retry timeouts from keeping the process alive.
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Only affects platforms with a `.unref()` method on timeouts, such as Node.js.
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@default false
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*/
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readonly unref?: boolean;
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};
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/**
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Returns a `Promise` that is fulfilled when calling `input` returns a fulfilled promise. If calling `input` returns a rejected promise, `input` is called again until the max retries are reached, it then rejects with the last rejection reason.
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Does not retry on most `TypeErrors`, with the exception of network errors. This is done on a best case basis as different browsers have different [messages](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch#Checking_that_the_fetch_was_successful) to indicate this. See [whatwg/fetch#526 (comment)](https://github.com/whatwg/fetch/issues/526#issuecomment-554604080)
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@param input - Receives the number of attempts as the first argument and is expected to return a `Promise` or any value.
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@param options - Options for configuring the retry behavior.
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@example
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```
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import pRetry, {AbortError} from 'p-retry';
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const run = async () => {
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const response = await fetch('https://sindresorhus.com/unicorn');
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// Abort retrying if the resource doesn't exist
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if (response.status === 404) {
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throw new AbortError(response.statusText);
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}
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return response.blob();
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};
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console.log(await pRetry(run, {retries: 5}));
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```
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*/
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export default function pRetry<T>(
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input: (attemptNumber: number) => PromiseLike<T> | T,
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options?: Options
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): Promise<T>;
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/**
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Wrap a function so that each call is automatically retried on failure.
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@example
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```
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import {makeRetriable} from 'p-retry';
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const fetchWithRetry = makeRetriable(fetch, {retries: 5});
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const response = await fetchWithRetry('https://sindresorhus.com/unicorn');
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```
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*/
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export function makeRetriable<Arguments extends readonly unknown[], Result>(
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function_: (...arguments_: Arguments) => PromiseLike<Result> | Result,
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options?: Options
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): (...arguments_: Arguments) => Promise<Result>;
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