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- declare namespace pMap {
- interface Options {
- /**
- Number of concurrently pending promises returned by `mapper`.
- @default Infinity
- */
- concurrency?: number;
- }
- /**
- Function which is called for every item in `input`. Expected to return a `Promise` or value.
- @param input - Iterated element.
- @param index - Index of the element in the source array.
- */
- type Mapper<Element = any, NewElement = any> = (
- input: Element,
- index: number
- ) => NewElement | Promise<NewElement>;
- }
- declare const pMap: {
- /**
- Returns a `Promise` that is fulfilled when all promises in `input` and ones returned from `mapper` are fulfilled, or rejects if any of the promises reject. The fulfilled value is an `Array` of the fulfilled values returned from `mapper` in `input` order.
- @param input - Iterated over concurrently in the `mapper` function.
- @param mapper - Function which is called for every item in `input`. Expected to return a `Promise` or value.
- @example
- ```
- import pMap = require('p-map');
- import got = require('got');
- const sites = [
- getWebsiteFromUsername('sindresorhus'), //=> Promise
- 'ava.li',
- 'todomvc.com',
- 'github.com'
- ];
- (async () => {
- const mapper = async site => {
- const {requestUrl} = await got.head(site);
- return requestUrl;
- };
- const result = await pMap(sites, mapper, {concurrency: 2});
- console.log(result);
- //=> ['http://sindresorhus.com/', 'http://ava.li/', 'http://todomvc.com/', 'http://github.com/']
- })();
- ```
- */
- <Element, NewElement>(
- input: Iterable<Element>,
- mapper: pMap.Mapper<Element, NewElement>,
- options?: pMap.Options
- ): Promise<NewElement[]>;
- // TODO: Remove this for the next major release, refactor the whole definition to:
- // declare function pMap<Element, NewElement>(
- // input: Iterable<Element>,
- // mapper: pMap.Mapper<Element, NewElement>,
- // options?: pMap.Options
- // ): Promise<NewElement[]>;
- // export = pMap;
- default: typeof pMap;
- };
- export = pMap;
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