useFakeTimers with typescript

[aboeglin]

I try to make an es6 project move to typescript. It's still pretty small at the moment. In the current test file there are no dependencies except the test file, chai and mocha.

I import sinon like this:

import * as sinon from 'sinon';

But it then throws at me when running the tests:

TypeError: Cannot read property 'now' of undefined
        at mirrorDateProperties (base/test/SESKApplication.test.js?cbd5a7d2db216d155cbf259dccb4fc057a6c807d:23248:16)
        at hijackMethod (base/test/SESKApplication.test.js?cbd5a7d2db216d155cbf259dccb4fc057a6c807d:23522:20)
        at Object.install (base/test/SESKApplication.test.js?cbd5a7d2db216d155cbf259dccb4fc057a6c807d:23793:13)
        at Object.exports.useFakeTimers (base/test/SESKApplication.test.js?cbd5a7d2db216d155cbf259dccb4fc057a6c807d:11686:21)
        at Context.<anonymous> (base/test/SESKApplication.test.js?cbd5a7d2db216d155cbf259dccb4fc057a6c807d:30655:21)

Everything else works just fine. It's only useFakeTimers which seems to be a little brittle somehow. I even tried to install types for lolex just in case, but that did not solve the issue.

• Sinon version : 5.0.0-next.3 ( tried 4.3 originally with the same issue )
• Environment : OSX 10.13.3
• Other libraries you are using: Mocha, Karma, Chai, Typescript 2.6

[mroderick]

@aboeglin did you find a solution to this problem?

[fatso83]

Whatever the reason is for this problem, it is highly likely to have nothing to do with TypeScript per se. Date or Performance is undefined for some reason, and as this problem is not reproducible without supporting code, I am closing this as it means we cant' do anything to help fix this until the issue description is improved.

[iraklisg]

I am facing the same problem after upgrading from sinon@4.4.6 to sinon@6.0.1

I made a silly little test to showcase the issue:

describe('Countdown', () => {
    it('should works', () => {
            const clock = sinon.useFakeTimers();
            expect(clock).to.be.an.instanceOf(Object);
    });
});

The test will fail with the following errors:

1. Countdown
   should works:
   TypeError: Cannot read property 'now' of undefined
   at mirrorDateProperties (.tmp/mocha-webpack/1530006960272/bundle.js:53971:20)
   at hijackMethod (.tmp/mocha-webpack/1530006960272/bundle.js:54274:24)
   at Object.install (.tmp/mocha-webpack/1530006960272/bundle.js:54664:17)
   at useFakeTimers (.tmp/mocha-webpack/1530006960272/bundle.js:54712:23)
   at Sandbox.useFakeTimers (.tmp/mocha-webpack/1530006960272/bundle.js:65700:47)
   at Context. (.tmp/mocha-webpack/1530006960272/bundle.js:24018:76)

[fatso83]

@iraklisg I cannot reproduce this locally or in this online demo. Try making a new demo in a fresh directory and make sure to install afresh (removing node_modules first). If it is still an issue, make a new issue.

[iraklisg]

@fatso83 sorry for the late reply, the issue is being reported also in #1852