Promiseの配列を順番に実行したい - Qiita

type Supplier<T> = () => T; export const sequence = <T>(promises: Supplier<PromiseLike<T>>[]): Promise<T[]> => { if (promises.length === 0) { return Promise.resolve([]); } return new Promise((resolve, reject) => { const results: T[] = []; promises .reduce((p1: Supplier<PromiseLike<T>>, p2: Supplier<PromiseLike<T>>): Supplier<PromiseLike<T>> => { return () => { return p1().then((t: T) => { results.