// @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)), ); }