Support for `jest.config.js`? about jest-coverage-ratchet

[Koleok]

I was able to find some time for this in the past few days, turns out its a little bit tricky to re-write a jest.confg.js file in a responsible way as opposed to a jest.config.json, simply because I can't just assume that file is

module.exports = {
  // config
}

It may be something like:

const cleverConfigLogicBasedOnEnv = {
  // ...
}

module.exports = {
  ...cleverConfigLogicBasedOnEnv,
  // rest of config
}

Certainly it can be done, it will just take some regexs and logic that will have to evolve over time as edge cases come up. With this in mind, I think the first pass will just support jest.config.json files while some thought is put into how to effectively deal with .js.

As a workaround until then, you could make a file called something like jest.coverageConfig.json that was there just for the purpose of ratcheting, then import that and spread it into your jest.config.js
jest.coverageConfig.json

{
  "coverageThreshold": {
    "global": {
      "lines": 86.67,
      "statements": 74.29,
      "functions": 10,
      "branches": 50
    }
  }
}

jest.config.js

const coverageConfig = require('./jest.coverageConfig.json')

module.exports = {
  ...coverageConfig,
  // rest of your config
}

then just make sure that you are running the command like

jest-coverage-ratchet --configPath ./jest.coverageConfig.json

[dbudwin]

There is a new package based on jest-coverage-ratchet that will do this that is still being maintained called jest-coverage-thresholds-bumper.

https://github.com/Litee/jest-coverage-thresholds-bumper

[Koleok]

Well its cool to see that someone is using this 😅 I will try to get this done in the PM hours this week, I haven't used it in my daily work for a few years so it had just left my mental inbox so to speak :)

[rkristelijn]

I found a workaround for this using the current version;

TL;DR import the thresholds directly from package.json

1. npm i -D jest-coverage-ratchet
2. add to package.json:

{
  "scripts": {
    "test:coverage": "jest-coverage-ratchet",
  }
}

3. npm run test:coverage (package.json now contains "jest": {})
4. update jest.config.js:

const jestConfig = require('./package.json').jest;

module.exports = {
  ...jestConfig,
}

[Koleok]

This is a pretty common case and worth supporting 👍

[SimplyComplexable]

@Koleok any update on this?

[ktalebian]

@SimplyComplexable doesn't look any new PR was closed recently.

[jamestalmond]

I would love this feature.

[ZuBB]

Hi @Koleok !

Just wanted to note next

simply because I can't just assume that file is...

thats true. different setups are possible.

However, in readme you already do some assumptions

I know what happens when you assume, but jest-coverage-ratchet makes the following assumptions about your project.

I would ask you to make one more.

BTW thanks for great lib

[Koleok]

@ZuBB Fair enough 👌 , lets give it a try with that assumption, seems there are few enough users of this lib that its not a crazy experiment to assume a certain format of jest.config.js, I'll push up the new version over the next few days with that packed in 👍