eslint-config-strict

14.0.1 verified Sat Apr 25 auth: no javascript deprecated

ESLint shareable config for extremely strict linting, enforcing high code quality and consistency. The current stable version is 14.0.1, which is the final release as the package has been deprecated in favor of eslint-config-strict-es6. It provides a comprehensive set of ESLint rules documented and justified per-rule, covering ES5, ES6, Mocha, browser, and Babel environments. Unlike many other configs, it includes additive presets for React and legacy Node 0.12 support was broken in v10.0.0. No longer actively maintained; last release was in 2017.

Common errors

error Error: Cannot find module 'eslint-config-strict' ↓

cause Package not installed.

fix

Run: npm install --save-dev eslint-config-strict

error Error: Cannot find module 'eslint-plugin-filenames' ↓

cause Missing dependency required by eslint-config-strict.

fix

Run: npm install --save-dev eslint-plugin-filenames

error Configuration for rule 'some-rule' is invalid ↓

cause ESLint version mismatch; newer ESLint may not support deprecated rules.

fix

Use an ESLint version compatible with eslint-config-strict (e.g., ESLint 6.x) or switch config.

Warnings

deprecated eslint-config-strict is deprecated. Use eslint-config-strict-es6 or another modern config. ↓

fix Switch to a maintained config like eslint-config-strict-es6 or eslint-config-airbnb.

breaking Node 0.12 support dropped in v10.0.0. ↓

fix Upgrade Node.js to version 4 or higher.

breaking Old code may cause errors with new configuration due to rule additions/enforcements in v13.0.0, v12.0.0, v11.0.0, etc. ↓

fix Review new rules and update code accordingly; run eslint --fix.

gotcha If using npm < v3, dependencies like eslint-plugin-filenames must be installed manually. ↓

fix Install eslint-plugin-filenames explicitly: npm install --save-dev eslint-plugin-filenames

Install

npm install eslint-config-strict

yarn add eslint-config-strict

pnpm add eslint-config-strict

Imports

strict
wrong
```
{ "extends": ["eslint-config-strict"] }
```
correct
```
{ "extends": ["strict"] }
```
ESLint resolves 'strict' to 'eslint-config-strict'; the full name is also valid but unnecessary.

strict/es5

wrong

{ "extends": ["strict/es5"] } is correct; no wrong pattern known.

correct

{ "extends": ["strict/es5"] }

ES5 configuration for projects not using ES6 features.

strict/browser

wrong

{ "extends": ["strict/browser"] } is correct; ensure env.browser is not also set.

correct

{ "extends": ["strict/browser"] }

Sets env.browser to true; can be combined with other presets.

strict/mocha

wrong

{ "extends": ["strict/mocha"] } is correct; adding env.mocha is redundant.

correct

{ "extends": ["strict/mocha"] }

Adds mocha env, globals, and disables certain rules.

strict/babel

wrong

Requires eslint-plugin-babel to be installed separately.

correct

{ "extends": ["strict/babel"] }

For Babel transpiled code; requires eslint-plugin-babel plugin.

Quickstart

Add eslint-config-strict to a project with basic configuration for ES5 and browser environment.

// package.json
{
  "devDependencies": {
    "eslint": "^6.0.0",
    "eslint-config-strict": "^14.0.0",
    "eslint-plugin-filenames": "^1.0.0"
  },
  "eslintConfig": {
    "extends": ["strict", "strict/browser", "strict/es5"]
  }
}