Registry / testing / eslint-plugin-babel

eslint-plugin-babel

library5.3.1jsnpmunverified

An ESLint plugin companion to babel-eslint that re-implements core ESLint rules to handle Babel experimental features such as decorators, optional chaining, class properties, do expressions, BigInt, and JSX fragment syntax. Version 5.3.1 is the latest stable release; it requires ESLint >=4.0.0 and Node >=4. The plugin replaces problematic built-in rules with Babel-aware versions to avoid false positives/negatives, and several older rules have been deprecated in favor of native ESLint rules or eslint-plugin-flowtype. It uses eslint-rule-composer for rule composition, is actively maintained, and supports autofix for some rules (marked with 🛠).

testing

npm install eslint-plugin-babel

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT-PLUGIN-BABE

eslint-plugin-babel

testingjavascriptv5.3.1

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

babel/new-cap

✓ // In .eslintrc: "rules": { "babel/new-cap": "error" }

✗ // wrong: using core rule with Babel code - false positives on decorators

Replace core 'new-cap' with 'babel/new-cap' to ignore capitalized decorators.

babel/camelcase

✓ // In .eslintrc: "rules": { "babel/camelcase": "error" }

✗ // wrong: core camelcase flags optional chaining like foo?.a_b

Supports optional chaining without false positives.

babel/no-invalid-this

✓ // In .eslintrc: "rules": { "babel/no-invalid-this": "error" }

✗ // wrong: core no-invalid-this errors on class properties using this

Allows this inside class properties.

babel/semi

✓ // In .eslintrc: "rules": { "babel/semi": "error" }

✗ // wrong: core semi fails on for await and class properties

Handles for-await and class properties; autofixable.

babel/object-curly-spacing

✓ // In .eslintrc: "rules": { "babel/object-curly-spacing": "error" }

✗ // wrong: core object-curly-spacing complains on export x from 'mod'

Supports export x from and export * as x from; autofixable.

Shows installation, plugin setup, and rule configuration. Remember to disable the core versions of replaced rules.

npm install eslint-plugin-babel --save-dev // .eslintrc.json { "plugins": ["babel"], "rules": { "babel/new-cap": "error", "babel/camelcase": "error", "babel/no-invalid-this": "error", "babel/semi": "error" } } // Disable the original rules in your config if they conflict: { "rules": { "new-cap": "off", "camelcase": "off", "no-invalid-this": "off", "semi": "off" } }

Debug

Known issues

breakingv5.0.0 dropped support for ESLint <4.0.0 and Node <4. Use eslint-rule-composer for rules.

fix

Upgrade ESLint to >=4.0.0 and Node to >=4. Ensure eslint-rule-composer is installed.

affects: >=5.0.0

deprecatedRules babel/generator-star-spacing, babel/object-shorthand, babel/arrow-parens, babel/func-params-comma-dangle, babel/array-bracket-spacing, babel/flow-object-type, and babel/no-await-in-loop are deprecated.

fix

Use corresponding core ESLint rules (or eslint-plugin-flowtype for flow-object-type) as listed in the README.

affects: >=4.0.0

deprecatedbabel/no-await-in-loop was deprecated in v4.1.1 and removed in later versions.

fix

Use core ESLint rule no-await-in-loop (supported since ESLint 3.12.0).

affects: >=4.1.1

deprecatedbabel/flow-object-type was deprecated in v4.0.0. Use eslint-plugin-flowtype's object-type-delimiter rule instead.

fix

Install eslint-plugin-flowtype and use flowtype/object-type-delimiter.

affects: >=4.0.0

gotchaDo not enable both the core rule and the babel rule for the same rule name — they will conflict.

fix

Disable the core rule (e.g., 'new-cap': 'off') when using the babel version.

affects: >=0.0.0

gotchaThe plugin does not automatically apply to all files; you must add the babel plugin to your ESLint config.

fix

Add '"plugins": ["babel"]' to your .eslintrc.

affects: >=0.0.0

Errors

Common errors & fixes

Error: Failed to load plugin 'babel': Cannot find module 'eslint-plugin-babel'

eslint-plugin-babel is not installed as a dev dependency.

fix

Run 'npm install eslint-plugin-babel --save-dev'

Error: ESLint configuration error: Unknown rule "babel/new-cap"

The 'babel' plugin is not listed in the 'plugins' section of your ESLint config.

fix

Add '"plugins": ["babel"]' to your .eslintrc.

Error: Cannot find module '@babel/eslint-parser' (or babel-eslint)

The plugin expects babel-eslint or @babel/eslint-parser as a parser, but it's missing.

fix

Install babel-eslint: 'npm install babel-eslint --save-dev' and set "parser": "babel-eslint" in your ESLint config.

Warning: Rule 'babel/flow-object-type' is deprecated

The rule was deprecated in favor of eslint-plugin-flowtype's object-type-delimiter.

fix

Replace 'babel/flow-object-type' with 'flowtype/object-type-delimiter' and install eslint-plugin-flowtype.

Upgrade

Version history

5.3.1latest on npm

Audit

Dependencies

eslint-rule-composerrequiredused internally to compose rules (since v5.0.0)

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/babel/eslint-plugin-babel ↗

packagehttps://www.npmjs.com/package/eslint-plugin-babel ↗