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+# p-retry
+
+> Retry a promise-returning or async function
+
+It does exponential backoff and supports custom retry strategies for failed operations.
+
+## Install
+
+```
+$ npm install p-retry
+```
+
+## Usage
+
+```js
+const pRetry = require('p-retry');
+const fetch = require('node-fetch');
+
+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 pRetry.AbortError(response.statusText);
+	}
+
+	return response.blob();
+};
+
+(async () => {
+	console.log(await pRetry(run, {retries: 5}));
+})();
+```
+
+## API
+
+### pRetry(input, options?)
+
+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 maximum number of retries is 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)
+
+
+#### input
+
+Type: `Function`
+
+Receives the current attempt number as the first argument and is expected to return a `Promise` or any value.
+
+#### options
+
+Type: `object`
+
+Options are passed to the [`retry`](https://github.com/tim-kos/node-retry#retryoperationoptions) module.
+
+##### onFailedAttempt(error)
+
+Type: `Function`
+
+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.
+
+```js
+const run = async () => {
+	const response = await fetch('https://sindresorhus.com/unicorn');
+
+	if (!response.ok) {
+		throw new Error(response.statusText);
+	}
+
+	return response.json();
+};
+
+(async () => {
+	const result = await pRetry(run, {
+		onFailedAttempt: error => {
+			console.log(`Attempt ${error.attemptNumber} failed. There are ${error.retriesLeft} retries left.`);
+			// 1st request => Attempt 1 failed. There are 4 retries left.
+			// 2nd request => Attempt 2 failed. There are 3 retries left.
+			// …
+		},
+		retries: 5
+	});
+
+	console.log(result);
+})();
+```
+
+The `onFailedAttempt` function can return a promise. For example, you can do some async logging:
+
+```js
+const pRetry = require('p-retry');
+const logger = require('./some-logger');
+
+const run = async () => { … };
+
+(async () => {
+	const result = await pRetry(run, {
+		onFailedAttempt: async error => {
+			await logger.log(error);
+		}
+	});
+})();
+```
+
+If the `onFailedAttempt` function throws, all retries will be aborted and the original promise will reject with the thrown error.
+
+### pRetry.AbortError(message)
+### pRetry.AbortError(error)
+
+Abort retrying and reject the promise.
+
+### message
+
+Type: `string`
+
+Error message.
+
+### error
+
+Type: `Error`
+
+Custom error.
+
+## Tip
+
+You can pass arguments to the function being retried by wrapping it in an inline arrow function:
+
+```js
+const pRetry = require('p-retry');
+
+const run = async emoji => {
+	// …
+};
+
+(async () => {
+	// Without arguments
+	await pRetry(run, {retries: 5});
+
+	// With arguments
+	await pRetry(() => run('🦄'), {retries: 5});
+})();
+```
+
+## Related
+
+- [p-timeout](https://github.com/sindresorhus/p-timeout) - Timeout a promise after a specified amount of time
+- [More…](https://github.com/sindresorhus/promise-fun)