Callback-based function to promise-based function.

cbtoasync.js

function cbtoasync(fncb, ...params) {
	return new Promise((res, rej) => {
		fncb(...params, (...data) => {res(...data)})
	})
}

function tr_cbtoasync(fncb) {
	return (...data) => cbtoasync(fncb, ...data)
}

/* Tests */

function testcb(data, cb) {
	cb(data)
}

testcb("hello", d => console.log(d + " world"))

cbtoasync(testcb, "hi").then(d => d + " dude").then(console.log)

const test = tr_cbtoasync(testcb)

test("yo").then(d => d + " bud").then(console.log)

;(async () => {
	const h = await test("hola")
	console.log(h + " amigo")
})()