rollup-jest

library3.1.0jsnpmunverified

Rollup preprocessor for Jest that transforms files using Rollup. Current version 3.1.0, actively maintained. Allows using Rollup plugins and configuration in Jest tests, supporting ES modules. Key differentiator: integrates Rollup's bundling and plugin ecosystem into Jest's transform pipeline, enabling features like plugin injection, caching, and custom resolve behavior. Peer dependency on Rollup ^2.3.0 || ^3. Provides preset for zero-config setup. Suitable for projects already using Rollup who want to reuse rollup config in tests.

testing

npm install rollup-jest

github ↗package ↗

INSTALL

IMPORT

SIG · ROLLUP-JEST

rollup-jest

testingjavascriptv3.1.0

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 18–223 runs

build_error

glibc

node 18–223 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default (preset)

✓ // In jest.config.json: "preset": "rollup-jest"

✗ Using require('rollup-jest') in jest config

Used as a Jest preset, not imported directly.

transform entry

✓ // In jest.config.json: "transform": { "\\.m?js$": "rollup-jest" }

✗ Trying to import rollup-jest as a module in test files

Configured in Jest's transform field, not imported in user code.

with options

✓ // In jest.config.json: "transform": { "\\.js$": ["rollup-jest", {"configFile": "./rollup.config.js"}] }

✗ Passing options as second argument to import statement

Options are passed as array in Jest transform config.

Install, configure preset, and write ES module test with default import.

npm install rollup-jest rollup --save-dev # jest.config.json { "jest": { "preset": "rollup-jest" } } # __tests__/example.test.js import path from 'path'; test('parses extname', () => { expect(path.extname('foo.md')).toBe('.md'); });

Debug

Known issues

breakingVersion 3 requires Rollup ^2.3.0 or ^3. Version 2 required Rollup ^1.0.0.

fix

Upgrade Rollup to ^2.3.0 or ^3 if using rollup-jest v3.

affects: >=3.0.0

deprecatedThe 'useCache' option may cause issues with plugins that have state (e.g. TypeScript).

fix

Set 'useCache: false' if experiencing stale results.

affects: >=1.0.0

gotchaTo use ESM configFile with Rollup v3, you must add --experimental-vm-modules to Node.js flags.

fix

Run Jest with NODE_OPTIONS=--experimental-vm-modules npm run test

affects: >=3.0.0 <4

gotchaDefault transform only matches .mjs and .js files. Other extensions like .ts or .jsx are not transformed unless explicitly added.

fix

Add a custom transform pattern for other extensions, e.g. "\\.ts$": "rollup-jest"

affects: >=1.0.0

Errors

Common errors & fixes

Cannot find module 'rollup-jest'

rollup-jest not installed or not in devDependencies

fix

npm install rollup-jest rollup --save-dev

Cannot use import statement outside a module

Jest not configured to transform the file with rollup-jest

fix

Add rollup-jest to Jest transform in jest.config.json

Jest encountered an unexpected token - SyntaxError: Unexpected token 'export'

File not transformed because transform pattern doesn't match

fix

Ensure the file extension matches the regex in Jest config (e.g., "\\.m?js$")

Upgrade

Version history

3.1.0latest on npm

Audit

Dependencies

rolluprequiredpeer dependency required for code transformation

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/ambar/rollup-jest ↗

packagehttps://www.npmjs.com/package/rollup-jest ↗