强制打字稿不删除未使用的引用

Question

Please check my demo project on github.

In my react-tfractal/tests/component/tfractal.spec.tsx test:

import * as React from 'react';
import * as ReactTestUtils from 'react-addons-test-utils';
import {expect} from 'chai';
import {Tfractal} from '../../src/tfractal';

var R = React;

describe('tfractal', function () {
  it('renders', function () {
    var tfractal = ReactTestUtils.renderIntoDocument(<Tfractal />);
    expect(tfractal).exist;
  });
}); 

React import is never used, but required by the react-addons-test-utils (I get an error message "React is not defined" without the React import). The problem is: without the line

var R = React;

this import is removed by the typescript compiler.

The

import 'react'

doesn't get removed but doesn't work (the same error message "React is not defined").

How can I work around it without creating a dummy variable?

Run

npm install
tsd install
npm run test 

to check.

Answer 1

I don't understand why this is happening to be honest, but try adding this line:

global.React = React

Or even this might work:

React;