Ts-node: Not refreshing code with mocha --watch when Unable to compile Typescript

[suzuki11109]

I've been using ts-node with mocha for running test. It works fine in watch mode. I can change from failing test to success smoothly. But when code error it shown TSError: ⨯ Unable to compile TypeScript by removing imported dependency. and then I put that dependency back. It's not work as expect.

Here's an example

import {expect} from 'chai';
import fizzbuzz from '../src/fizzbuzz';

describe('fizzbuzz', () => {
  it('input 1 return 1', () => {
    expect(fizzbuzz(1)).to.equal('1');
  });
});

output is (this failing test is OK)

  2 passing (45ms)
  1 failing

  1) fizzbuzz input 1 return 1:
     AssertionError: expected undefined to equal '1'
      at Context.<anonymous> (../../test/test.ts:6:28)

and remove dependency and save file

import {expect} from 'chai';

describe('fizzbuzz', () => {
  it('input 1 return 1', () => {
    expect(fizzbuzz(1)).to.equal('1');
  });
});

and it's ok to error

TSError: ⨯ Unable to compile TypeScript
test/test.ts (6,12): Cannot find name 'fizzbuzz'. (2304)

but when I put it back and save the file

import {expect} from 'chai';
import fizzbuzz from '../src/fizzbuzz';

describe('fizzbuzz', () => {
  it('input 1 return 1', () => {
    expect(fizzbuzz(1)).to.equal('1');
  });
});

mocha's not comming back and the error show up again

TSError: ⨯ Unable to compile TypeScript
test/test.ts (6,12): Cannot find name 'fizzbuzz'. (2304)

This is my mocha opts

--require ts-node/register
--reporter nyan
--watch-extensions tsx,ts
test/**/*.tsx
test/**/*.ts

Please help me
Thanks

[silviogutierrez]

Can confirm this is happening on my setup as well. But when say, I purposely break a test (by making it fail), and then fix it, it does re-run tests. So only on compilation errors.

[EddyLane]

This is also happening in my set up. If you set the flags:

TS_NODE_IGNORE_WARNINGS=TRUE TS_NODE_DISABLE_WARNINGS=TRUE

then this doesn't happen, but it silently fails to compile so you don't get compilation errors.

[arusakov]

mocha -w and ts-node don't work together in my project too

[Eoksni]

@EddyLane
I think you only need TS_NODE_IGNORE_WARNINGS=TRUE.
It makes it recompile on change even after compilation error and you still get errors when it fails to compile.

[agborkowski]

same here.. TS_NODE_IGNORE_WARNINGS just silent down errors... needs cmd+c and run again

fixed by https://github.com/TypeStrong/ts-node/issues/266

[cspotcode]

Closing because the original issue does not happen on the latest ts-node and mocha.

https://github.com/TypeStrong/ts-node-repros/tree/issue-113
https://github.com/TypeStrong/ts-node-repros/runs/1029421954