50 lines
1.3 KiB
TypeScript
50 lines
1.3 KiB
TypeScript
export interface Options {
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/**
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The number of concurrently pending promises returned by `tester`.
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Minimum: `1`
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@default Infinity
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*/
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readonly concurrency?: number;
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/**
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Preserve `input` order when searching.
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Disable this to improve performance if you don't care about the order.
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@default true
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*/
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readonly preserveOrder?: boolean;
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}
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/**
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Get the first fulfilled promise that satisfies the provided testing function.
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@param input - An iterable of promises/values to test.
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@param tester - This function will receive resolved values from `input` and is expected to return a `Promise<boolean>` or `boolean`.
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@returns A `Promise` that is fulfilled when `tester` resolves to `true` or the iterable is done, or rejects if any of the promises reject. The fulfilled value is the current iterable value or `undefined` if `tester` never resolved to `true`.
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@example
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```
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import {pathExists} from 'path-exists';
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import pLocate from 'p-locate';
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const files = [
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'unicorn.png',
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'rainbow.png', // Only this one actually exists on disk
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'pony.png'
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];
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const foundPath = await pLocate(files, file => pathExists(file));
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console.log(foundPath);
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//=> 'rainbow'
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```
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*/
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export default function pLocate<ValueType>(
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input: Iterable<PromiseLike<ValueType> | ValueType>,
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tester: (element: ValueType) => PromiseLike<boolean> | boolean,
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options?: Options
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): Promise<ValueType | undefined>;
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