| 1 | import {OperationOptions} from 'retry';
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| 2 |
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| 3 | declare class AbortErrorClass extends Error {
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| 4 | readonly name: 'AbortError';
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| 5 | readonly originalError: Error;
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| 6 |
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| 7 | /**
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| 8 | Abort retrying and reject the promise.
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| 9 |
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| 10 | @param message - Error message or custom error.
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| 11 | */
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| 12 | constructor(message: string | Error);
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| 13 | }
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| 14 |
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| 15 | declare namespace pRetry {
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| 16 | interface FailedAttemptError extends Error {
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| 17 | readonly attemptNumber: number;
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| 18 | readonly retriesLeft: number;
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| 19 | }
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| 20 |
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| 21 | interface Options extends OperationOptions {
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| 22 | /**
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| 23 | Callback invoked on each retry. Receives the error thrown by `input` as the first argument with properties `attemptNumber` and `retriesLeft` which indicate the current attempt number and the number of attempts left, respectively.
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| 24 |
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| 25 | The `onFailedAttempt` function can return a promise. For example, to add a [delay](https://github.com/sindresorhus/delay):
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| 26 |
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| 27 | ```
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| 28 | import pRetry = require('p-retry');
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| 29 | import delay = require('delay');
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| 30 |
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| 31 | const run = async () => { ... };
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| 32 |
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| 33 | (async () => {
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| 34 | const result = await pRetry(run, {
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| 35 | onFailedAttempt: async error => {
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| 36 | console.log('Waiting for 1 second before retrying');
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| 37 | await delay(1000);
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| 38 | }
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| 39 | });
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| 40 | })();
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| 41 | ```
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| 42 |
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| 43 | If the `onFailedAttempt` function throws, all retries will be aborted and the original promise will reject with the thrown error.
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| 44 | */
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| 45 | readonly onFailedAttempt?: (error: FailedAttemptError) => void | Promise<void>;
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| 46 | }
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| 47 |
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| 48 | type AbortError = AbortErrorClass;
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| 49 | }
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| 50 |
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| 51 | declare const pRetry: {
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| 52 | /**
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| 53 | 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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| 54 |
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| 55 | 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.
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| 56 | See [whatwg/fetch#526 (comment)](https://github.com/whatwg/fetch/issues/526#issuecomment-554604080)
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| 57 |
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| 58 | @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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| 59 | @param options - Options are passed to the [`retry`](https://github.com/tim-kos/node-retry#retryoperationoptions) module.
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| 60 |
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| 61 | @example
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| 62 | ```
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| 63 | import pRetry = require('p-retry');
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| 64 | import fetch from 'node-fetch';
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| 65 |
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| 66 | const run = async () => {
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| 67 | const response = await fetch('https://sindresorhus.com/unicorn');
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| 68 |
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| 69 | // Abort retrying if the resource doesn't exist
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| 70 | if (response.status === 404) {
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| 71 | throw new pRetry.AbortError(response.statusText);
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| 72 | }
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| 73 |
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| 74 | return response.blob();
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| 75 | };
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| 76 |
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| 77 | (async () => {
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| 78 | console.log(await pRetry(run, {retries: 5}));
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| 79 |
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| 80 | // With the `onFailedAttempt` option:
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| 81 | const result = await pRetry(run, {
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| 82 | onFailedAttempt: error => {
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| 83 | console.log(`Attempt ${error.attemptNumber} failed. There are ${error.retriesLeft} retries left.`);
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| 84 | // 1st request => Attempt 1 failed. There are 4 retries left.
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| 85 | // 2nd request => Attempt 2 failed. There are 3 retries left.
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| 86 | // …
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| 87 | },
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| 88 | retries: 5
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| 89 | });
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| 90 |
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| 91 | console.log(result);
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| 92 | })();
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| 93 | ```
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| 94 | */
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| 95 | <T>(
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| 96 | input: (attemptCount: number) => PromiseLike<T> | T,
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| 97 | options?: pRetry.Options
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| 98 | ): Promise<T>;
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| 99 |
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| 100 | AbortError: typeof AbortErrorClass;
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| 101 |
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| 102 | // TODO: remove this in the next major version
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| 103 | default: typeof pRetry;
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| 104 | };
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| 105 |
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| 106 | export = pRetry;
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