SOURCE

function initState(vm, state) {
	for (const key in state) {
    vm.model[key] = state[key];
  }
}
function initComputed(vm, computed) {
	for (const key in computed) {
    const userDef = _.bind(computed[key], vm);

    vm.model[key] = userDef()
  }
}
class Model {
	constructor(model) {
		this.model = {};
		initState(this, model.state);
		initComputed(this, model.computed);
	}
}
let a = new Model({
  state: {
    a: "111"
  },
  computed: {
    b: () => this.model.a + "2";
  }
})
con