prototypeBind.js

/**
 * Binds a function to a type's prototype, allowing it to be called as a method on instances of that type.
 * 
 * @param {Function} type The type whose prototype to bind the function to
 * @param {Function} fn The function to bind to the prototype. Must be a named function. It's first argument will be the instance of the type on which it is called, followed by any additional arguments.
 */
const prototypeBind = (type, fn) => {
    if (!type || !type.prototype) {
        throw new Error('First argument must be a type with a prototype.');
    }
    if (!fn || typeof fn !== 'function' || !fn.name || fn.name.length === 0) {
        throw new Error('Second argument must be a named function.');
    }
    if (type.prototype) {
        type.prototype[fn.name] = function (...args) { return fn(this, ...args); }
    }
}