eslint-plugin-es5

1.5.0 verified Sat Apr 25 auth: no javascript

ESLint plugin that enforces ES5-only code by forbidding ES2015+ syntax. Version 1.5.0 (stable, no recent updates). Maintains a comprehensive set of rules covering arrow functions, classes, destructuring, modules, generators, and more. Includes fixable rules for many features. Unlike similar plugins, provides preset configurations like `plugin:es5/no-es2015` to ban all ES2015 features at once. Requires ESLint >=3.

Common errors

error Error: Cannot find module 'eslint-plugin-es5' ↓

cause Plugin not installed or not in node_modules

fix

Run npm install --save-dev eslint-plugin-es5

error Configuration for rule "es5/no-arrow-functions" is invalid: Severity should be one of the following: 0 = off, 1 = warn, 2 = error (you passed '"error"') ↓

cause Using string severity instead of numeric in some ESLint config contexts

fix

Use numeric severity: 'error' => 2 or use string in modern ESLint configs (check ESLint version)

error Rule 'es5/no-block-scoping' has been deprecated and replaced by 'es5/no-const' and 'es5/no-let' ↓

cause Older versions had separate rules, but unified in this plugin

fix

Use 'es5/no-block-scoping' with options or switch to individual rules if needed

Warnings

gotcha Rules may conflict with other ESLint rules that allow ES2015 features. ↓

fix Disable conflicting rules or ensure es5 rules are evaluated last.

gotcha Plugin does not handle TypeScript or JSX - those parsers may allow ES2015 syntax even with plugin enabled. ↓

fix Use TypeScript-specific plugins or parser options to enforce ES5.

deprecated Preset `plugin:es5/no-es2015` is still available but not updated for newer ES features beyond ES2016. ↓

fix Consider using `plugin:es5/no-es2016` for ES2016 restrictions or manually configure rules for later versions.

Install

npm install eslint-plugin-es5

yarn add eslint-plugin-es5

pnpm add eslint-plugin-es5

Imports

plugin

wrong

ESLint config should use `plugins` array, not import

correct

plugins: ['es5']

Added to ESLint config under `plugins` key.

rules
wrong
```
'es5/no-arrow-functions': 2
```
correct
```
'es5/no-arrow-functions': 'error'
```
Use string severity 'error' or 'warn', not numeric.

preset

wrong

extends: ['eslint:recommended', 'es5/no-es2015']

correct

extends: ['plugin:es5/no-es2015']

Preset is accessed via `plugin:es5/no-es2015`, not direct name.

Quickstart

Configures ESLint to use eslint-plugin-es5 with specific rules and a preset to enforce ES5 syntax.

// .eslintrc.json
{
  "plugins": ["es5"],
  "rules": {
    "es5/no-arrow-functions": "error",
    "es5/no-template-literals": "warn",
    "es5/no-block-scoping": ["error", { "let": true, "const": true }]
  }
}

// Or use preset to forbid all ES2015:
{
  "extends": ["eslint:recommended", "plugin:es5/no-es2015"],
  "rules": {
    "es5/no-for-of": "error"
  }
}