[feat] Add an option to save the generated jest.config.js

I want to be able to run jest tests from within my IDE (IDEA). It is far easier to just run jest directly than through tsdx test.

What I did was hacked a console.log() into node_modules/tsdx/lib/index.js, output the generated jest config and saved that in a jest.config.js file. Had to edit it a bit to remove the absolute paths (🤷‍♂ why those are there), but it works perfectly.

So, it would be nice to have something like the eslintconfig save option, but for the jest config.

[jimmyn]

@lookfirst I totally agree. I’m working in WebStorm and it has good integration with Jest but it will only work with jest.config.js present because otherwise, typescript will not compile during tests.

I ended up creating jest.config.js with

const {createJestConfig} = require('tsdx/dist/createJestConfig');
const {paths} = require('tsdx/dist/constants');

process.env.BABEL_ENV = 'test';
process.env.NODE_ENV = 'test';

module.exports = createJestConfig(undefined, paths.appRoot);

It works although it’s far from ideal solution as createJestConfig checks if jest.config.js file is present and might create a recursive loop

It would be awesome to add similar functionality to yarn lint --write-file

[jaredpalmer]

Yes, tsdx test makes sense so we can upgrade jest for all of our users