make-thenable

make-thenable

Make an object thenable without a fuss

What it does

const makeThenable = require('make-thenable')

const promiseLike = {}

const [resolve, reject] = makeThenable(promiseLike)

Now, the given object behaves exactly like a good little Promise: you can add callbacks through promiseLike.then and promiseLike.catch, and resolve/reject through the return values. That is because it is now linked to a real Promise. Consequently, in Internet Explorer, you need a polyfill.

Also resolvable

const makeThenable = require('make-thenable/resolvable')

const promiseLike = makeThenable({})

This gives you the same functionality as above, plus promiseLike.resolve and promiseLike.reject.

Why it exists

Sometimes, you need an arbitrary object to behave like a Promise. In times like these, just make it thenable and be happy.

After writing the original version, I came across an article by Lea Verou, and thought I'd cover her use-case as well. That's why there's make-thenable/resolvable