overleaf/libraries/metrics/.eslintrc

{
  "extends": [
    "standard",
    "prettier",
    "prettier/standard"
  ],
  "parserOptions": {
    "ecmaVersion": 2018
  },
  "plugins": [
    "mocha",
    "chai-expect",
    "chai-friendly"
  ],
  "env": {
    "node": true
  },
  "rules": {
    // Swap the no-unused-expressions rule with a more chai-friendly one
    "no-unused-expressions": 0,
    "chai-friendly/no-unused-expressions": "error"
  },
  "overrides": [
    {
      // Test specific rules
      "files": ["test/**/*.js"],
      "env": {
        "mocha": true 
      },
      "globals": {
        "expect": true
      },
      "rules": {
        // mocha-specific rules
        "mocha/handle-done-callback": "error",
        "mocha/no-exclusive-tests": "error",
        "mocha/no-global-tests": "error",
        "mocha/no-identical-title": "error",
        "mocha/no-nested-tests": "error",
        "mocha/no-pending-tests": "error",
        "mocha/no-skipped-tests": "error",
        "mocha/no-mocha-arrows": "error",

        // chai-specific rules
        "chai-expect/missing-assertion": "error",
        "chai-expect/terminating-properties": "error",

        // prefer-arrow-callback applies to all callbacks, not just ones in mocha tests.
        // we don't enforce this at the top-level - just in tests to manage `this` scope
        // based on mocha's context mechanism
        "mocha/prefer-arrow-callback": "error"
      }
    }
  ]
}