mock-everything.js

mock-everything.js

const mock = new Proxy(() => mock, {
    get: (target, prop) => {
      if (
        prop === 'valueOf' ||
        prop === 'toString' ||
        prop === Symbol.toPrimitive
      ) {
        return () => '';
      }
     return mock
    }
  });

This will allow calling mock.foo.bar.baz.blub() while still enabling use as primitive value '' + mock.foo.bar.baz.blub === ''