Concurrence Packages

Iterator based utilities for handling sync & async tasks like async execution with a maximum for parallel tasks at the same time

Controllable and resonable job queue manager

Middy Lock Redis Lambda

#### how to use ``` // or import const runAll = require('promise-run-all');

并发场景下，避免相同耗时操作`action`被重复触发，第`1`个请求触发`action`后，后续`n`个同质请求被`await`住，直到`action`执行结束，`n`个同质请求再继续执行，并直接使用`action`的结果。