Jest + Typescript minus TS-Jest

ts-jest is a well-liked package deal whenever you attempt to use typescript with jest.

However one difficulty that’s bugging me not too long ago is, the uncovered traces stat isn’t appropriate, my check protection dropped by 10+%.

After googling, nothing helpful come up, and after some troubleshooting, I discovered that it was ts-jest that inflicting the difficulty

so I made a decision to make use of babel for compilation as a substitute

set up dependencies

npm i -D @babel/preset-env @babel/preset-typescript typescript jest
Enter fullscreen mode

Exit fullscreen mode

setup npm script

"scripts": {
  "check": "jest",
}
Enter fullscreen mode

Exit fullscreen mode

create a jest.config.js

/** @kind {import('ts-jest/dist/varieties').InitialOptionsTsJest} */

module.exports = {
    testEnvironment: 'node',
    roots: ['<rootDir>/src'],
    testMatch: ['**/__tests__/**/*.+(ts|js)', '**/?(*.)+(spec|test).+(ts|js)'],
    remodel: ts)$': 'babel-jest',
    ,
    moduleDirectories: ['node_modules', 'src'],
    collectCoverage: true,
    collectCoverageFrom: ['**/*.{js,ts}', '!**/*.d.ts'],
}
Enter fullscreen mode

Exit fullscreen mode

create a babel.config.js

module.exports = {
    presets: [
        '@babel/preset-typescript',
        [
            '@babel/preset-env',
            {
                targets: {
                    node: 'current',
                },
            },
        ],
    ],
}
Enter fullscreen mode

Exit fullscreen mode

you need not set up babel-jest, it comes with jest

lastly npm check and increase, your 100% check protection is again.

Add a Comment

Your email address will not be published. Required fields are marked *

Recent Posts

Join us on Social Media

Facebook Twitter Youtube