jest config

The jest config does not add any configuration files but, updates your eslint config with the relevant Jest eslint plugins. If you do not already have an eslint configuration file, this config will add a eslint config as specified in the eslint config docs and update it with the Jest plugins.

To add the jest config to your project, add the following to package.json

...
"calavera": {
    "jest": true
}

Skeletons

If no eslint config exists, this adds the following files to the root of your project:

• .eslintrc.json

.eslintrc.json

{
    "extends": [
        "eslint:recommended",
        "plugin:import/errors",
        "plugin:jest/recommended",
        "plugin:jest/style"
    ],
    "rules": {
        "no-console": 1
    },
    "plugins": [
        "import"
    ],
    "parserOptions": {
        "ecmaVersion": 2018
    },
    "env": {
        "es6": true,
        "browser": true,
        "node": true
    }
}

If your project already had an eslint config, the following two entries are added to the extends array:

• plugin:import/errors
• plugin:jest/recommended

Dev dependencies

jest config adds the following devDependencies:

• jest
• eslint-plugin-jest

If no eslint config existed, it will also add the following dependecnies:

• eslint
• eslint-plugin-import

Calavera will output the command you need to run to install the above dependencies inside your project.