Registry / testing / eslint-config-hardcore

eslint-config-hardcore

library49.0.0jsnpmunverified

The most strict (yet practical) ESLint config, bundling 51 plugins and 1376 rules for maximum code consistency and robustness. Current stable version is 49.0.0, released with a cadence of major updates every few months. It supports ESLint v8 (legacy config format) and TypeScript >=4.7.4. Key differentiators: it is the most comprehensive ESLint config available, covering React, Vue, Node, Jest, FP, performance, and more through modular sub-configs. Notably, v49 is likely the last major release supporting ESLint v8 and legacy config; future versions will target ESLint v9 and flat config, and may drop plain JavaScript support entirely.

testing

npm install eslint-config-hardcore

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT-CONFIG-HARD

eslint-config-hardcore

testingjavascriptv49.0.0

Install

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Import

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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.

hardcore (config)

✓ extends: ['hardcore'] in .eslintrc.json

✗ importing the package directly in code (e.g., const config = require('eslint-config-hardcore'))

Used via ESLint's extends mechanism; not a programmatic import.

hardcore/ts

✓ extends: ['hardcore', 'hardcore/ts'] in .eslintrc.json

✗ using hardcore/ts without also extending hardcore first

Additional TypeScript rules; requires parserOptions.project to be set.

hardcore/react

✓ extends: ['hardcore', 'hardcore/react'] in .eslintrc.json

✗ extending hardcore/react without a React environment configured

Assumes React is installed; includes react-specific rules.

Sets up the base hardcore config with TypeScript support for a browser project. Requires ESLint v8 and TypeScript >=4.7.4.

// 1. Install npm install eslint-config-hardcore --save-dev // 2. Create .eslintrc.json { "root": true, "extends": ["hardcore", "hardcore/ts"], "parserOptions": { "project": true }, "env": { "browser": true } } // 3. Run ESLint npx eslint .

Debug

Known issues

breakingv49.0.0: Updated typescript-eslint to v7, added perfectionist rules, and changed import/docstyle to tomdoc (affects import/no-deprecated).

fix

Review new rules; adjust code for tomdoc style in JSDoc comments if needed.

affects: >=49.0.0

breakingv49.0.0 is the last major release supporting ESLint v8 and legacy config. Next major will require ESLint v9 and flat config.

fix

Prepare migration to ESLint v9 and flat config when upgrading beyond v49.

affects: >49.0.0

deprecatedFuture major release will likely support only TypeScript projects; plain JavaScript support may be dropped.

fix

Migrate to TypeScript or consider alternative configs if maintaining JS-only projects.

affects: >49.0.0

gotchaThe config is extremely strict (1376+ rules). Expect many lint errors on existing codebases; incremental adoption recommended.

fix

Use eslint's --quiet flag or disable specific rules in your overrides to onboard gradually.

affects: *

gotchaThe 'hardcore/ts' config requires parserOptions.project to be set (commonly 'true' or a tsconfig path). Missing this causes parse errors.

fix

Add 'parserOptions': { 'project': true } to your ESLint config.

affects: *

Errors

Common errors & fixes

Error: Failed to load plugin 'import' declared in 'hardcore': Cannot find module 'eslint-plugin-import'

eslint-config-hardcore has many plugin dependencies that must be installed alongside it.

fix

Run 'npm install eslint-config-hardcore --save-dev' which installs all peer dependencies automatically, or manually install missing plugins.

Parsing error: The keyword 'import' is reserved

TypeScript parser not configured when using hardcore/ts config.

fix

Add 'parser': '@typescript-eslint/parser' (or rely on hardcore/ts to set it) and 'parserOptions.project'.

ESLint couldn't determine the plugin 'unicorn' uniquely.

Multiple versions of eslint-plugin-unicorn installed or conflicting plugin aliases.

fix

Ensure only one version of eslint-plugin-unicorn is installed: 'npm dedupe' or check package-lock.

Configuration for rule 'import/order' is invalid

The hardcore config sets very strict import ordering rules that may conflict with existing .eslintrc settings.

fix

Either override the rule in your config: 'rules': { 'import/order': 'off' } or adjust your code to match the expected order.

Upgrade

Version history

49.0.0latest on npm

Audit

Dependencies

eslintrequiredpeer dependency: requires ^8.57.0 (legacy config); future versions may require v9

typescriptoptionalpeer dependency: requires >=4.7.4 for TypeScript configs

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/EvgenyOrekhov/eslint-config-hardcore ↗

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