jarb

3.0.10-0 verified Fri May 01 auth: no javascript

Reusable lint, webpack, babel and jest configuration package, version 3.0.10-0. Provides shared configurations for JavaScript/TypeScript projects, reducing setup overhead. Release cadence is irregular. Key differentiator: combines multiple tool configs into one dependency, but note that many projects now prefer using eslint-config-* or @babel/preset-env directly with more flexibility.

Common errors

error Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: .../node_modules/jarb/index.js ↓

cause Using require() on an ESM-only package in Node.js.

fix

Change to import statement or use --es-module-specifier-resolution=node flag.

error TypeError: Cannot assign to read only property 'rules' of object '#<Object>' ↓

cause Attempting to mutate the frozen config object.

fix

Create a copy: const myConfig = { ...lintConfig, rules: { ...lintConfig.rules, 'my-rule': 'warn' } };

Warnings

breaking Version 3.0.0 drops CommonJS support; require() will fail. ↓

fix Switch to ESM imports or use dynamic import() if necessary.

deprecated The default export jarb() may be deprecated in future versions in favor of named exports. ↓

fix Use named exports like lintConfig, webpackConfig, etc.

gotcha Configuration objects are frozen and cannot be mutated; merging with overrides requires cloning. ↓

fix Use Object.assign or spread operator to create a new config object.

Install

npm install jarb

yarn add jarb

pnpm add jarb

Imports

jarb

wrong

const jarb = require('jarb')

correct

import jarb from 'jarb'

ESM-only since v3; no CommonJS support.

lintConfig

wrong

const { lintConfig } = require('jarb')

correct

import { lintConfig } from 'jarb'

Named export for ESLint configuration.

webpackConfig
```
import { webpackConfig } from 'jarb'
```
Named export for webpack configuration.

Quickstart

Imports and uses all config exports from jarb package.

import jarb from 'jarb';
import { lintConfig, webpackConfig, babelConfig, jestConfig } from 'jarb';

// Use configurations directly
// For example, in .eslintrc.js:
module.exports = lintConfig;

// In webpack.config.js:
module.exports = webpackConfig;

// In .babelrc:
module.exports = babelConfig;

// In jest.config.js:
module.exports = jestConfig;

// Or use the default export for combined setup:
const config = jarb();
console.log(config);