More better mobx way?

mobxStore.js

const Model = require('Model');

class Store {
  constructor() {
    extendObservable(this, {
      items: asFlat([]), // wanna make this Array<Model>
    })
  }

  fooFunc(someData) {
    this.items.push(new Model(someData)); // but I don't want to write `new`
  }

  barFunc(someDataArr) {
    this.items.replace(someDataArr.map((data) => { return new Model(data); })); // so many times..
  }
}

• createTransformer is suitable for this case?
• or should use Intercept?

my workaround.

constructor() {
  // ...

  intercept(this.items, __toModelInterceptor);

  function __toModelInterceptor(change) {
    change.added = change.added.map((item) => {
      return new Model(item);
    });
    return change;
  }
}