POC nodejs autoloader - `node --harmony_proxies index.js`

autoload.js

"use strict";

module.exports = function autoload() {
    try {
        require.resolve("harmony-reflect");
    } catch (err) {
        throw new Error("You should install harmony-reflect module and use the --harmony_proxies flag to use this feature");
    }

    require("harmony-reflect");

    global.__proto__ = new Proxy(
        Object.getPrototypeOf(global.__proto__),
        {
            get: (target, key) => {
                if (key !== "v8debug" && target[key] === undefined) {
                    let path = key.toLowerCase().replace("_", "/");

                    try {
                        target[key] = require(path);
                    } catch (e) {
                        target[key] = require(__dirname + "/" + path);
                    }
                }

                return target[key];
            }
        }
    );
};

bar.js

"use strict";

class Bar extends Foo {}

module.exports = Bar;

foo.js

"use strict";

class Foo {}

module.exports = Foo;

index.js

"use strict";

let autoload = require("./autoload");

autoload();

console.log(fs.readFileSync);          // [Function]
console.log(new Bar());                // Bar {}
console.log(new Bar() instanceof Foo); // true