Function expect

test-storybooks/ember-cli/ember-output/assets/vendor.js:48416–48419

(val, message)

    return val;
  }
  function expect(val, message) {
    if (val === null || val === undefined) throw new Error(message);
    return val;
  }
  function unreachable(message) {
    if (message === void 0) {
      message = 'unreachable';