@win-t/waitcb v1.0.1

waitcb

Simple utility to convert NodeJS callback style to Promise

example:

const { waitcb } = require('@win-t/waitcb')
const { exec } = require('child_process')

const main = async () => {
  try {
    const [stdout, stderr] = await waitcb(cb => exec(
      `echo out text >&1; echo err text >&2; exit ${Math.floor(Math.random() * 2)}`, cb,
    ))
    console.log('ok', { stdout, stderr })
  } catch (e) {
    const [stdout, stderr] = e[waitcb.resKey]
    console.log('fail', { exitCode: e.code, exitSignal: e.signal, stdout, stderr })
  }
}

main()

How to use

This package provide single function waitcb this function take 1 argument fn and return Promise

fn is a function that take cb,

cb is a function that you can pass into NodeJS callback parameter

The promise value, when resolved, is an array, whatever called to cb (excluding the first error arg)

When the promise is rejected (cb is called with first parameter not null), then you can access the rest of the parameter called to cb using waitcb.resKey symbol