Cannot find module 'assert' of testing in Meteor 1.3-beta.12

help
1

I try to create project with Meteor 1.3-beta.12, but get bug in browser console

Cannot find module 'assert'

In testing code

import assert from "assert";
import {name as appName} from "./test-1.3.js";

describe("test-1.3", () => {
  it("should export its name", () => {
    assert.strictEqual(appName, "test-1.3");
  });
});