eslint-plugin-mocha

ESLint rules for mocha.

Install and configure

This plugin requires ESLint 9.0.0 or later.

npm install --save-dev eslint-plugin-mocha

Configuration via eslint.config.js

To use this plugin with the new eslint configuration format (flat config):

import mochaPlugin from "eslint-plugin-mocha";

export default [
    mochaPlugin.configs.flat.recommended, // or `mochaPlugin.configs.flat.all` to enable all
    // ... Your configurations here
];

Plugin Settings

This plugin supports the following settings, which are used by multiple rules:

• additionalCustomNames: This allows rules to check additional function names when looking for suites or test cases. This might be used with a custom Mocha extension, such as ember-mocha or mocha-each.

  Example:

  {
      "rules": {
          "mocha/no-skipped-tests": "error",
          "mocha/no-exclusive-tests": "error"
      },
      "settings": {
          "mocha/additionalCustomNames": [
              {
                  "name": "describeModule",
                  "type": "suite",
                  "interfaces": ["BDD"]
              },
              {
                  "name": "testModule",
                  "type": "testCase",
                  "interfaces": ["TDD"]
              }
          ]
      }
  }

  The name property can be in any of the following forms:

  • A plain name e.g. describeModule, which allows:

    describeModule("example", function() { ... });

  • A dotted name, e.g. describe.modifier, which allows:

    describe.modifier("example", function() { ... });

  • A name with parentheses, e.g. forEach().describe, which allows:

    forEach([ 1, 2, 3 ])
        .describe("example", function(n) { ... });

  • Any combination of the above, e.g. forEach().describeModule.modifier, which allows:

    forEach([ 1, 2, 3 ])
        .describeModule.modifier("example", function(n) { ... });

Configs

recommended

This plugin exports a recommended config that enforces good practices.

Enable it with the extends option:

{
    "extends": ["plugin:mocha/recommended"]
}

all

There's also a configuration that enables all of our rules.

See Configuring Eslint on eslint.org for more info.

Rules

💼 Configurations enabled in.
⚠️ Configurations set to warn in.
🚫 Configurations disabled in.
✅ Set in the recommended configuration.
🔧 Automatically fixable by the --fix CLI option.

Name	Description	💼	⚠️	🚫	🔧
consistent-spacing-between-blocks	Require consistent spacing between blocks	✅			🔧
handle-done-callback	Enforces handling of callbacks for async tests	✅
max-top-level-suites	Enforce the number of top-level suites in a single file	✅
no-async-describe	Disallow async functions passed to describe	✅			🔧
no-empty-description	Disallow empty test descriptions	✅
no-exclusive-tests	Disallow exclusive tests		✅
no-exports	Disallow exports from test files	✅
no-global-tests	Disallow global tests	✅
no-hooks	Disallow hooks			✅
no-hooks-for-single-case	Disallow hooks for a single test or test suite			✅
no-identical-title	Disallow identical titles	✅
no-mocha-arrows	Disallow arrow functions as arguments to mocha functions	✅			🔧
no-nested-tests	Disallow tests to be nested within other tests	✅
no-pending-tests	Disallow pending tests		✅
no-return-and-callback	Disallow returning in a test or hook function that uses a callback	✅
no-return-from-async	Disallow returning from an async test or hook			✅
no-setup-in-describe	Disallow setup in describe blocks	✅
no-sibling-hooks	Disallow duplicate uses of a hook at the same level inside a describe	✅
no-skipped-tests	Disallow skipped tests		✅
no-synchronous-tests	Disallow synchronous tests			✅
no-top-level-hooks	Disallow top-level hooks		✅
prefer-arrow-callback	Require using arrow functions for callbacks			✅	🔧
valid-suite-description	Require suite descriptions to match a pre-configured regular expression			✅
valid-test-description	Require test descriptions to match a pre-configured regular expression			✅