Inventing GObject ES6 Classes (1)

legacy.js

const MyClass = new Lang.Class({
    Name: 'MyClass',
    GTypeName: 'MyNamespaceMyClass',
    Extends: GObject.Object,
    Implements: [Gio.Initable, MyCustomInterface],
    Properties: {
        'prop': GObject.ParamSpec.int( /* etc., etc. */ ),
    },
    Signals: {
        'signal': { param_types: [ /* etc., etc. */ ] },
    },

    _init(props={}) {
        this.parent(props);
        // etc.
    },

    get prop() { /* ... */ },

    method(arg) { /* ... */ },
});