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