Disable ESLint's "no-undef" rule for a specific folder when using Jest

Currently, I am using jest for testing my api calls. In addition, I utilize eslint to validate my test codes. However, since jest does not require explicit definition of methods such as test() or expect(), when running eslint, I encounter errors like:

   4:1  error  'test' is not defined    no-undef
   8:3  error  'expect' is not defined  no-undef

For instance, in my jest file index.test.js, the code looks like:

test('API test', async () => {
  const response = await axios.post('api call', {});
  const { status, statusText, message } = response;
  expect(status).toBe(400);
  expect(statusText).toBe('Bad Request');
  expect(message).toBe('No password.');
});

Since it's not necessary to define test() and expect for jest, I have been exploring eslint documentation to find a way to selectively ignore these rules in certain files while keeping the rest intact. Any suggestions or help would be greatly appreciated.

P.S. my .eslintrc file looks like:

{
  "parser": "babel-eslint",
  "extends": "eslint:recommended",
  "env": {
    "commonjs": true,
    "es6": true,
    "node": true,
    "browser": false
  },
  "parserOptions": {
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": false
    },
    "sourceType": "module"
  },
  "globals": {
    "strapi": true
  },
  "rules": {
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "linebreak-style": ["error", "unix"],
    "no-console": 0,
    "quotes": ["error", "single"],
    "semi": ["error", "always"],
    "multiline-ternary": ["error", "always"]
  }
}

Answer №1

When configuring ESLint and specifying the environment as jest, this ensures that test() and expect() are not considered as undefined. To accommodate this, it is recommended to include the following default test files for jest:

"**/*.spec.js", "**/__mocks__/**"

.eslintrc
{
  // your configuration
  "overrides": [
    {
      "files": ["**/*.spec.js", "**/__mocks__/**"],
      "env": {
        "jest": true
      }
    }
  ]

Edit: Alternatively, you can add "jest": true to your global environment. However, it is worth noting that if you unintentionally use jest's global functions such as describe, test, it, beforeAll, etc., ESLint will not flag an error.

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