A functional compose util that maintains the identity of the returned function:
import compose from 'compose-identity';
const x = num => num + 1;
const y = num => num * 2;
const z = compose(x, y); // num => y(x(num))
// compose always returns the same function!
assert(z === compose(x, y));
yarn add compose-identity
Or, less ideally:
npm install compose-identity
MIT