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eslint-config-preact

library2.0.0jsnpmunverified

Unopinionated baseline ESLint configuration for Preact and Preact CLI codebases. Current stable version is 2.0.0, released with ESLint v9 support and dropped support for legacy configs. It provides sensible defaults for modern JS, JSX, Preact, Jest, and Mocha, avoiding stylistic or subjective rules. This config helps catch bugs and suggests optimal patterns. It has a low release cadence (major versions every ~1-2 years). Differentiator: focused solely on Preact, unlike generic React configs.

testing web-framework

npm install eslint-config-preact

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT-CONFIG-PREA

eslint-config-preact

testingjavascriptv2.0.0

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.

default

✓ import preact from 'eslint-config-preact'

✗ const preact = require('eslint-config-preact')

ESM default export. In CommonJS, use `const {default: preact} = require('eslint-config-preact')`.

default with ESM

✓ export default [...preact];

✗ export default preact;

The config exports an array, must be spread into your eslint config array.

default with CommonJS

✓ const {default: preact} = require('eslint-config-preact'); module.exports = [...preact];

✗ const preact = require('eslint-config-preact'); module.exports = preact;

CommonJS users must destructure `default` and spread the array.

Shows how to import and extend eslint-config-preact in an ESLint flat config file.

// eslint.config.js import preact from 'eslint-config-preact'; export default [ ...preact, // your custom rules { rules: { 'no-console': 'warn' } } ];

Debug

Known issues

breakingVersion 2.0.0 drops support for legacy .eslintrc configs. Only flat config (eslint.config.js) is supported.

fix

Migrate to eslint.config.js using the flat config format. See the quickstart for an example.

affects: >=2.0.0

breakingVersion 2.0.0 requires ESLint v8.57.1 or v9.0.0+. ESLint v7 is no longer supported.

fix

Upgrade ESLint to version ^8.57.1 || ^9.0.0.

affects: >=2.0.0

deprecatedVersion 1.x used legacy config format; migration to flat config is needed for v2.

fix

Update to v2 and use flat config, or pin to v1.x if you cannot migrate.

affects: >=1.0.0 <2.0.0

gotchaThe config is exported as an array; it must be spread into your config array. Using it directly as a single element will not apply rules correctly.

fix

Use `...preact` inside the exported array.

affects: >=2.0.0

gotchaCommonJS users must destructure the `default` export: `const {default: preact} = require('eslint-config-preact')`.

fix

See installation instructions.

affects: >=2.0.0

Errors

Common errors & fixes

Cannot find module 'eslint-config-preact'

Package not installed or missing peer dependency eslint.

fix

Run npm i -D eslint eslint-config-preact.

Failed to load config "preact" to extend from.

Using legacy .eslintrc with v2 which requires flat config.

fix

Use eslint.config.js (flat config) or downgrade to v1.x.

Invalid config: "preact" is not a valid configuration object.

Array config imported without spread.

fix

Use `...preact` inside the config array.

Module "eslint-config-preact" does not export a default export

Using CommonJS require without destructuring default.

fix

Use `const {default: preact} = require('eslint-config-preact')`.

Upgrade

Version history

2.0.0latest on npm

Audit

Dependencies

eslintrequiredPeer dependency required for eslint to work

Agent activity

10 hits · last 30 days

node

Resources

githubhttps://github.com/preactjs/eslint-config-preact ↗

packagehttps://www.npmjs.com/package/eslint-config-preact ↗