23 lines
716 B
Plaintext
23 lines
716 B
Plaintext
// @flow strict
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import type { ObjMap } from './ObjMap';
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/**
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* This function transforms a JS object `ObjMap<Promise<T>>` into
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* a `Promise<ObjMap<T>>`
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*
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* This is akin to bluebird's `Promise.props`, but implemented only using
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* `Promise.all` so it will work with any implementation of ES6 promises.
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*/
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export default function promiseForObject<T>(
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object: ObjMap<Promise<T>>,
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): Promise<ObjMap<T>> {
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const keys = Object.keys(object);
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const valuesAndPromises = keys.map((name) => object[name]);
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return Promise.all(valuesAndPromises).then((values) =>
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values.reduce((resolvedObject, value, i) => {
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resolvedObject[keys[i]] = value;
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return resolvedObject;
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}, Object.create(null)),
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);
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}
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