Use with Jest

I followed the instructions for integrating with Jest. It works.

However I got a warning:

ts-jest[main] (WARN) Replace any occurrences of “ts-jest/dist/preprocessor.js” or “<rootDir>/node_modules/ts-jest/preprocessor.js” in the ‘transform’ section of your Jest config with just “ts-jest”.

So I did that, but it doesn’t work:

transform: {
  "^.+\\.ts$": "ts-jest"
}

I also tried something I found at ts-jest, but it doesn’t work:

globals: {
  "ts-jest": {
    "compiler": "ttypescript"
  }
}

The warning implies it’s possible - with some tweaking we could avoid the preprocessor and increase speed.

Has anyone got this to work?

cc @dsherret, @Kukks

[lonix1]

Hey @dsherret I just upgraded to today’s "ts-jest": "24.0.0".

I was still getting those warnings, but since it’s a new version I wanted to see if the problem is still there. So in jest.config I replaced

transform: {
    "^.+\\.ts$": "<rootDir>/.jest.tspreprocessor.js"
}

with

transform: {
    "^.+\\.ts$": "ts-jest"
}

And now the warnings go away, and the tests seem to work! So the issue is finally resolved. And no need for that preprocessor any more, so presumably the tests will be faster (though I haven’t felt a speed difference, but maybe that’s just me).

[lonix1]

I can’t believe all the hoops I had to jump through to get this working properly, and yet, I’m HAPPY to have done so.

All for a single operator! Says a lot. So sorely missing from the language itself!

Kudos again for this library, what a difference it makes to my code!