Registry / testing / karma-rollup-plugin

karma-rollup-plugin

library0.2.4jsnpmunverified

A Karma preprocessor plugin that integrates Rollup for on-the-fly bundling and ES2015+ transpilation in test environments. Current version is 0.2.4 (stable, but rarely updated). It supports Rollup plugins, source maps (inline), and multiple ES versions via Babel or Buble. Compared to alternatives like karma-rollup-preprocessor, this plugin is simpler, more actively maintained at the time, and more aligned with the Rollup ecosystem. However, it lacks modern Rollup features and may not work with Rollup >=1.0.

testing

npm install karma-rollup-plugin

github ↗package ↗

INSTALL

IMPORT

SIG · KARMA-ROLLUP-PLUGI

karma-rollup-plugin

testingjavascriptv0.2.4

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.

rollupPreprocessor (Karma config key)

✓ // In karma.conf.js rollupPreprocessor: { /* options */ }

✗ rollupPreprocessor: require('karma-rollup-plugin')

The plugin is automatically loaded by Karma. No explicit require() in karma.conf.js.

Plugin as a module (programmatic use)

✓ const karmaRollup = require('karma-rollup-plugin');

✗ import karmaRollup from 'karma-rollup-plugin';

Plugin exports a function for programmatic configuration, but typically used via Karma config.

Preprocessor in preprocessors

✓ preprocessors: { 'test/**/*.js': ['rollup'] }

✗ preprocessors: { 'test/**/*.js': ['karma-rollup-plugin'] }

Use the short name 'rollup', not the package name.

Configures Karma to use the rollup preprocessor for test files, with Rollup and Buble plugin for transpilation.

// karma.conf.js module.exports = function (config) { config.set({ basePath: '', frameworks: ['jasmine'], files: [ 'test/**/*.spec.js' ], preprocessors: { 'test/**/*.spec.js': ['rollup'] }, rollupPreprocessor: { plugins: [ require('rollup-plugin-buble')() ], format: 'iife', sourceMap: 'inline' }, reporters: ['progress'], port: 9876, colors: true, logLevel: config.LOG_INFO, autoWatch: true, browsers: ['ChromeHeadless'], singleRun: false }); };

Debug

Known issues

breakingNo support for Rollup >=1.0 due to API changes.

fix

Upgrade to a maintained fork or use karma-rollup-preprocessor with Rollup compatibility.

affects: >=0.2.4

deprecatedPackage is no longer actively maintained; last release was years ago.

fix

Consider using @open-wc/karma-esm or karma-rollup-preprocessor.

affects: >=0.0.0

gotchaUsing 'umd' format without a module name throws a warning and may produce unexpected results.

fix

Always specify a module name when using 'umd', or use 'iife' for tests.

affects: >=0.0.0

gotchaSource maps must be 'inline' because Karma expects them inlined for proper debugging.

fix

Set sourceMap: 'inline' in rollupPreprocessor config.

affects: >=0.0.0

Errors

Common errors & fixes

Error: Cannot find module 'rollup'

Rollo is not installed or is a missing peer dependency.

fix

Run: npm install rollup --save-dev

TypeError: rollup.rollup is not a function

Incompatible Rollup version >=1.0 where API changed.

fix

Install Rollup 0.x: npm install rollup@0.68.2 --save-dev

WARN: 'umd' format requires a module name. Use the 'moduleName' option.

Using 'umd' format without 'moduleName' in rollupPreprocessor.

fix

Add moduleName to rollupPreprocessor or switch to 'iife'.

Upgrade

Version history

0.2.4latest on npm

Audit

Dependencies

rolluprequiredpeer dependency for bundling functionality

Agent activity

8 hits · last 30 days

node

Resources

githubhttps://github.com/TrySound/karma-rollup-plugin ↗

packagehttps://www.npmjs.com/package/karma-rollup-plugin ↗