'use strict' module.exports = (obj, proto, bound) => { bound = bound || Object.create(null) if (Array.isArray(bound)) bound = bound.reduce((s, k) => (s[k] = true, s), Object.create(null)) // don't try to bind constructors, it's weird bound.constructor = true proto = proto || obj Object.keys(proto) .filter(k => (typeof obj[k] === 'function' && !bound[k])) .forEach(k => (bound[k] = true, obj[k] = proto[k].bind(obj))) Object.getOwnPropertyNames(proto) .filter(k => (typeof obj[k] === 'function' && !bound[k])) .forEach(k => (bound[k] = true, Object.defineProperty(obj, k, { value: obj[k].bind(obj), enumerable: false, configurable: true, writable: true }))) }