How to configure Wallaby to run with lerna packages, each with their own jest.config.js

[ryall]

My project is currently configured using multiple Lerna packages, each with their own jest.config.js setup.

If I copy and paste the wallaby.js config to each package root directory and select the configuration every time I change packages, everything works well.

<root>/
    packages/
        lib-one/
            jest.config.js
            wallaby.js
        lib-two/
            jest.config.js
            wallaby.js
        lib-three/
            jest.config.js
            wallaby.js
    package.json

However, this becomes very tiresome with the more packages I add to the project.

Instead I'd prefer to have a single master wallaby.js configuration in the project root and load all the configured packages (including their independent jest.config.js files) at once, so that I don't have to keep switching configurations.

<root>/
    packages/
        lib-one/
            jest.config.js
        lib-two/
            jest.config.js
        lib-three/
            jest.config.js
    package.json
    wallaby.js

Experimenting with the config, I was unable to achieve this.

[smcenlly]

To get Wallaby working, Jest must be installed in the mono-repo root. You must also configure jest to run from your mono-repo root (i.e. from the CLI with npx jest). To do this:

1. Install jest in your <root> directory.
2. Configure jest to run for your entire mono-repo using npx jest from the CLI at the mono-repo root. For example:

// <root>/jest.config.js

module.exports = { 
  projects: [
    '<rootDir>/packages/lib-one/jest.config.js', 
    '<rootDir>/packages/lib-two/jest.config.js',
    '<rootDir>/packages/lib-three/jest.config.js',
  ] 
};

[ryall]

Took a while because of the Babel CWD issue (jestjs/jest#7359) but managed to get it working. Thanks!