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