eslint-config-formidable

4.0.0 verified Sat Apr 25 auth: no javascript maintenance

A composable set of ESLint configurations from Formidable, based on eslint-config-walmart. Version 4.0.0 is the latest stable release but appears to be unmaintained since 2017. Compatible with ESLint 2.x and 3.x. Provides full configurations for ES5, ES6, React, browser, Node, and test environments, plus piecemeal rule sets. Differs from alternatives by offering granular rule categories (e.g., best-practices, ES6, Node) that can be extended individually. Key dependencies: eslint-plugin-import, eslint-plugin-filenames, and optionally babel-eslint and eslint-plugin-react.

Common errors

error ESLint couldn't find the config "formidable". Please make sure to list it in your eslint config. ↓

cause Global ESLint installation cannot resolve shareable configs from packages.

fix

Install eslint locally: npm install --save-dev eslint eslint-config-formidable and run via npm scripts or ./node_modules/.bin/eslint ..

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

cause Missing required dependency for all configurations.

fix

Install the plugin: npm install --save-dev eslint-plugin-filenames.

Warnings

deprecated This package is no longer actively maintained by Formidable. ↓

fix Migrate to modern ESLint configs like eslint-config-prettier or eslint-config-airbnb.

gotcha Global ESLint installation fails to extend this config properly due to ESLint issue #43. ↓

fix Install ESLint locally and use `./node_modules/.bin/eslint .` or npm scripts.

gotcha This config tracks old ESLint version (3.19.0) and plugins (eslint-plugin-react 6.0.0). ↓

fix Update to newer ESLint and plugins; consider using more recent config packages.

gotcha The 'formidable' top-level config is ES6-only, not ES5. ↓

fix Use 'formidable/configurations/es5' for ES5 projects.

Install

npm install eslint-config-formidable

yarn add eslint-config-formidable

pnpm add eslint-config-formidable

Imports

formidable
wrong
```
extends: ['eslint-config-formidable']
```
correct
```
extends: ['formidable']
```
Extend by name without package prefix in .eslintrc for ESLint>=2.0.
formidable/configurations/es5
wrong
```
extends: ['formidable-configurations-es5']
```
correct
```
extends: ['formidable/configurations/es5']
```
Path-style configuration extension, not a module name.

formidable/rules/eslint/best-practices/on

wrong

requires: ['formidable/rules/eslint/best-practices/on']

correct

extends: ['formidable/rules/eslint/best-practices/on']

Use 'extends' not 'requires' for piecemeal rules.

Quickstart

Shows how to extend the ES6+React configuration in .eslintrc, and notes workaround for global ESLint limitation.

.eslintrc:
---
"extends":
  - "formidable/configurations/es6-react"

Then run `./node_modules/.bin/eslint .` because global ESLint may not resolve config correctly.