ESLint

Packer ships ESLint 10 flat config modules. Legacy .eslintrc is not supported in 1.0.

JavaScript / JSX

Create eslint.config.js:

const recommended = require('@ekz/packer/recommended');

module.exports = [...recommended];

TypeScript

Add the TypeScript overlay:

const recommended = require('@ekz/packer/recommended');
const typescript = require('@ekz/packer/typescript');

module.exports = [...recommended, ...typescript];

Lint script

{
    "scripts": {
        "lint": "npx eslint .",
        "lint:fix": "yarn lint --fix"
    }
}

Do not pass --ext or set ESLINT_USE_FLAT_CONFIG — flat config is the default.

Custom rules

Append config objects after the Packer spreads:

module.exports = [
    ...recommended,
    ...typescript,
    {
        rules: {
            // your overrides
        }
    }
];

For React hooks on TypeScript (e.g. custom exhaustive-deps additionalHooks), add a rules-only block — Packer already registers eslint-plugin-react-hooks for *.{js,jsx,ts,tsx}:

module.exports = [
    ...recommended,
    ...typescript,
    {
        files: ['**/*.{ts,tsx}'],
        rules: {
            'react-hooks/exhaustive-deps': [
                'warn',
                { additionalHooks: '(useMyHook|useOtherHook)' }
            ]
        }
    }
];

Do not wrap eslint-plugin-react-hooks in fixupPluginRules — only eslint-plugin-react needs @eslint/compat today.

TypeScript project config

Extend Packer's shared tsconfig:

{
    "extends": "./node_modules/@ekz/packer/tsconfig/recommended.json",
    "include": ["src"],
    "compilerOptions": {
        "baseUrl": ".",
        "ignoreDeprecations": "6.0",
        "paths": {
            "@root/*": ["src/*"]
        }
    }
}

The @root/* path matches Packer's webpack alias. When copying the monorepo example, adjust the extends path if dependencies are hoisted differently.