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- export class AbortError extends Error {
- readonly name: 'AbortError';
- readonly originalError: Error;
- /**
- Abort retrying and reject the promise. No callback functions will be called.
- @param message - An error message or a custom error.
- */
- constructor(message: string | Error);
- }
- export type RetryContext = {
- readonly error: Error;
- readonly attemptNumber: number;
- readonly retriesLeft: number;
- readonly retriesConsumed: number;
- /**
- The delay in milliseconds before the next retry attempt.
- This is calculated based on `minTimeout`, `factor`, `maxTimeout`, and `randomize` options.
- Note: The actual delay may be shorter if it would exceed `maxRetryTime`.
- This is `0` when the retry is skipped or when no retry will occur based on the checks completed before the current callback runs.
- */
- readonly retryDelay: number;
- };
- export type Options = {
- /**
- Callback invoked on each failure. Receives a context object containing the error and retry state information.
- The function is called after `shouldConsumeRetry` and before `shouldRetry`, for all errors except `AbortError`.
- The function is not called on `AbortError`.
- @example
- ```
- import pRetry from 'p-retry';
- const run = async () => {
- const response = await fetch('https://sindresorhus.com/unicorn');
- if (!response.ok) {
- throw new Error(response.statusText);
- }
- return response.json();
- };
- const result = await pRetry(run, {
- onFailedAttempt: ({error, attemptNumber, retriesLeft, retriesConsumed, retryDelay}) => {
- console.log(`Attempt ${attemptNumber} failed. Retrying in ${retryDelay}ms. ${retriesLeft} retries left.`);
- // 1st request => Attempt 1 failed. Retrying in 1000ms. 5 retries left.
- // 2nd request => Attempt 2 failed. Retrying in 2000ms. 4 retries left.
- // …
- },
- retries: 5
- });
- console.log(result);
- ```
- The `onFailedAttempt` function can return a promise. For example, to add a [delay](https://github.com/sindresorhus/delay):
- @example
- ```
- import pRetry from 'p-retry';
- import delay from 'delay';
- const run = async () => { … };
- const result = await pRetry(run, {
- onFailedAttempt: async () => {
- console.log('Waiting for 1 second before retrying');
- await delay(1000);
- }
- });
- ```
- If the `onFailedAttempt` function throws, all retries will be aborted and the original promise will reject with the thrown error.
- */
- readonly onFailedAttempt?: (context: RetryContext) => void | Promise<void>;
- /**
- Decide if a retry should occur based on the context. Returning true triggers a retry, false aborts with the error.
- The function is called after `onFailedAttempt` and `shouldConsumeRetry`.
- The function is not called on `AbortError`, `TypeError` (except network errors), or if `retries` or `maxRetryTime` are exhausted.
- @example
- ```
- import pRetry from 'p-retry';
- const run = async () => { … };
- const result = await pRetry(run, {
- shouldRetry: ({error, attemptNumber, retriesLeft}) => !(error instanceof CustomError)
- });
- ```
- In the example above, the operation will be retried unless the error is an instance of `CustomError`.
- If the `shouldRetry` function throws, all retries will be aborted and the original promise will reject with the thrown error.
- */
- readonly shouldRetry?: (context: RetryContext) => boolean | Promise<boolean>;
- /**
- Decide if this failure should consume a retry from the `retries` budget.
- When `false` is returned, the failure will not consume a retry or increment backoff values, but is still subject to `maxRetryTime`.
- The function is called before `onFailedAttempt` and `shouldRetry`.
- The function is not called on `AbortError`.
- @example
- ```
- import pRetry from 'p-retry';
- const run = async () => { … };
- const result = await pRetry(run, {
- retries: 2,
- shouldConsumeRetry: ({error, retriesLeft}) => {
- console.log(`Retries left: ${retriesLeft}`);
- return !(error instanceof RateLimitError);
- },
- });
- ```
- In the example above, `RateLimitError`s will not decrement the available `retries`.
- If the `shouldConsumeRetry` function throws, all retries will be aborted and the original promise will reject with the thrown error.
- */
- readonly shouldConsumeRetry?: (context: RetryContext) => boolean | Promise<boolean>;
- /**
- The maximum amount of times to retry the operation.
- @default 10
- */
- readonly retries?: number;
- /**
- The exponential factor to use.
- @default 2
- */
- readonly factor?: number;
- /**
- The number of milliseconds before starting the first retry.
- Set this to `0` to retry immediately with no delay.
- @default 1000
- */
- readonly minTimeout?: number;
- /**
- The maximum number of milliseconds between two retries.
- @default Infinity
- */
- readonly maxTimeout?: number;
- /**
- Randomizes the timeouts by multiplying with a factor between 1 and 2.
- @default false
- */
- readonly randomize?: boolean;
- /**
- The maximum time (in milliseconds) that the retried operation is allowed to run.
- @default Infinity
- Measured with a monotonic clock (`performance.now()`) so system clock adjustments do not affect the limit.
- */
- readonly maxRetryTime?: number;
- /**
- You can abort retrying using [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController).
- ```
- import pRetry from 'p-retry';
- const run = async () => { … };
- const controller = new AbortController();
- cancelButton.addEventListener('click', () => {
- controller.abort(new Error('User clicked cancel button'));
- });
- try {
- await pRetry(run, {signal: controller.signal});
- } catch (error) {
- console.log(error.message);
- //=> 'User clicked cancel button'
- }
- ```
- */
- readonly signal?: AbortSignal | undefined;
- /**
- Prevents retry timeouts from keeping the process alive.
- Only affects platforms with a `.unref()` method on timeouts, such as Node.js.
- @default false
- */
- readonly unref?: boolean;
- };
- /**
- 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.
- 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)
- Non-network `TypeError`s always abort retries, even if `shouldConsumeRetry` or `shouldRetry` would otherwise allow another attempt.
- @param input - Receives the number of attempts as the first argument and is expected to return a `Promise` or any value.
- @param options - Options for configuring the retry behavior.
- @example
- ```
- import pRetry, {AbortError} from 'p-retry';
- const run = async () => {
- const response = await fetch('https://sindresorhus.com/unicorn');
- // Abort retrying if the resource doesn't exist
- if (response.status === 404) {
- throw new AbortError(response.statusText);
- }
- return response.blob();
- };
- console.log(await pRetry(run, {retries: 5}));
- ```
- */
- export default function pRetry<T>(
- input: (attemptNumber: number) => PromiseLike<T> | T,
- options?: Options
- ): Promise<T>;
- /**
- Wrap a function so that each call is automatically retried on failure.
- @example
- ```
- import {makeRetriable} from 'p-retry';
- const fetchWithRetry = makeRetriable(fetch, {retries: 5});
- const response = await fetchWithRetry('https://sindresorhus.com/unicorn');
- ```
- */
- export function makeRetriable<Arguments extends readonly unknown[], Result>(
- function_: (...arguments_: Arguments) => PromiseLike<Result> | Result,
- options?: Options
- ): (...arguments_: Arguments) => Promise<Result>;
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