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babel-preset-jest

library30.3.0jsnpmunverified

Babel preset for Jest, part of the Jest monorepo. Current version 30.3.0, released as part of Jest 30. This preset automatically configures Babel plugins needed for Jest to work with your code (e.g., transforms for ES modules, JSX, and TypeScript). Relies on @babel/core (peer dep) and babel-jest. Key differentiator: it's the official Jest preset, ensuring compatibility with Jest's internal module transformation. Actively maintained with frequent releases alongside Jest. Not to be used standalone; instead used via babel-jest or jest config.

testing

npm install babel-preset-jest

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · BABEL-PRESET-JEST

babel-preset-jest

testingjavascriptv30.3.0

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

✓ // No need to import directly; configure in Jest or Babel

✗ import preset from 'babel-preset-jest'

Use via babel.config.js: module.exports = { presets: ['babel-preset-jest'] } or jest config transform

createTransformer

✓ import { createTransformer } from 'babel-jest'

✗ import { createTransformer } from 'babel-preset-jest'

createTransformer is in babel-jest, not babel-preset-jest

require presets

✓ module.exports = { presets: ['jest'] }

✗ const preset = require('babel-preset-jest'); module.exports = { presets: [preset] }

Simply use string 'jest' in Babel config; package resolution handles it

Shows how to configure Jest with babel-preset-jest in Babel config and how to let babel-jest apply it automatically.

// Install: npm install --save-dev babel-preset-jest @babel/core // In babel.config.js: module.exports = { presets: ['@babel/preset-env', 'jest'] }; // Or in jest.config.js: module.exports = { transform: { '^.+\\.jsx?$': 'babel-jest', }, // The preset is automatically applied when using babel-jest };

Debug

Known issues

breakingJest 30 dropped support for Node 16 and 18 (prior to 18.14), requiring Node >=18.14.

fix

Upgrade Node to >=18.14.0

affects: >=30.0.0

breakingJest 30 changed the default transform from babel-jest to a new runtime, but babel-preset-jest can still be used. If you rely on automatic Babel integration, you may need to explicitly configure `transform` in jest config.

fix

In jest.config.js: transform: { '^.+\\.jsx?$': 'babel-jest' }

affects: >=30.0.0

gotchababel-preset-jest is not imported directly; it's used via Babel config string 'jest' or automatically by babel-jest. Trying to import it as a module will not work.

fix

Use 'jest' as a string in presets array, or rely on babel-jest.

affects: *

deprecatedIn older Jest versions (<29), babel-preset-jest included @babel/plugin-transform-modules-commonjs by default. Starting from Jest 29, this plugin is no longer automatically added; you must install and configure it explicitly if needed.

fix

Install @babel/plugin-transform-modules-commonjs and add to your babel.config.js plugins array.

affects: <29.0.0

Errors

Common errors & fixes

Error: Requires Babel "^7.0.0-0", but was loaded with "8.0.0"

babel-preset-jest requires @babel/core version 7 or 8 beta, but you have version 8 stable installed.

fix

Install @babel/core@^7.11.0: npm install --save-dev @babel/core@^7.11.0

Module not found: Can't resolve 'babel-jest'

Missing babel-jest dependency when using jest's default babel transform.

fix

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

Jest: `babel-jest` is required for using the `.babelrc` or `babel.config.js` files. Install it: npm install --save-dev babel-jest

babel-jest is not installed but Jest is trying to use Babel transforms.

fix

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

Upgrade

Version history

30.3.0latest on npm

Audit

Dependencies

@babel/corerequiredpeer dependency: required by Babel to perform transformations

Agent activity

18 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/jestjs/jest ↗

packagehttps://www.npmjs.com/package/babel-preset-jest ↗

homepagehttps://jestjs.io ↗