webpack-babel-jest

1.0.4 verified Sat Apr 25 auth: no javascript deprecated

A Jest preprocessor plugin that integrates Webpack and Babel for testing JavaScript files. Version 1.0.4 (latest) is deprecated in favor of modern Jest transform patterns. It works with old Jest configuration (scriptPreprocessor) and Babel-Jest, automatically ignoring CSS/SCSS/LESS imports. No active maintenance since 2016.

Common errors

error Could not find module 'webpack-babel-jest' from 'rootDir' ↓

cause Incorrect path or module not installed in project root.

fix

Install locally: npm install --save-dev webpack-babel-jest; check node_modules path.

error Cannot find module 'babel-jest' ↓

cause babel-jest is a required peer dependency not installed.

fix

Install babel-jest: npm install --save-dev babel-jest

Warnings

deprecated This package is unmaintained and relies on old Jest APIs. ↓

fix Use modern Jest transform: transform: { '^.+\\.js$': 'babel-jest' }

breaking Jest v20+ removed scriptPreprocessor; you must use transform instead. ↓

fix Remove scriptPreprocessor, use transform: { '^.+\\.js$': 'babel-jest' }

Install

npm install webpack-babel-jest

yarn add webpack-babel-jest

pnpm add webpack-babel-jest

Imports

default

wrong

import webpackBabelJest from 'webpack-babel-jest';

correct

Not imported; configured via package.json jest.scriptPreprocessor

This is a preprocessor script, not a module you import directly.

scriptPreprocessor

wrong

scriptPreprocessor: require('webpack-babel-jest')

correct

jest.scriptPreprocessor = '<rootDir>/node_modules/webpack-babel-jest';

Must be a string path, not a module reference.

Quickstart

Shows typical package.json configuration for using this preprocessor with Jest.

// package.json
{
  "devDependencies": {
    "webpack-babel-jest": "*",
    "jest-cli": "*"
  },
  "scripts": {
    "test": "jest"
  },
  "jest": {
    "scriptPreprocessor": "<rootDir>/node_modules/webpack-babel-jest",
    "testFileExtensions": ["es6", "js"],
    "moduleFileExtensions": ["js", "json", "es6"]
  }
}