Registry / testing / karma-webpack-with-fast-source-maps

karma-webpack-with-fast-source-maps

library1.10.2jsnpmunverified

A fork of karma-webpack that adds support for file-based source maps and hot testing. Version 1.10.2 supports webpack 1-3. It allows running only affected tests on file changes using a manifest array, and provides faster source map generation via 'cheap-module-source-map' devtool. This package is largely superseded by modern karma-webpack versions (5+) that include better source map support and webpack 5 compatibility. It is not actively maintained and should not be used for new projects.

testing devops

npm install karma-webpack-with-fast-source-maps

github ↗package ↗

INSTALL

IMPORT

SIG · KARMA-WEBPACK-WITH

karma-webpack-with-fast-source-maps

testingjavascriptv1.10.2

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.

plugin

✓ // In karma.conf.js, set frameworks: ['karma-webpack-with-fast-source-maps'] is not needed; just specify preprocessor

✗ plugins: ['karma-webpack-with-fast-source-maps']

This package is a preprocessor plugin, not a framework. Do not register it as a framework or plugin.

preprocessor

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

✗ preprocessors: { 'test/**/*.js': ['karma-webpack-with-fast-source-maps'] }

The preprocessor name is 'webpack', not the full package name.

webpackOptions

✓ webpack: { devtool: 'cheap-module-source-map', ... }

✗ webpack: { devtool: 'source-map' }

Using 'source-map' gives slower inline maps, 'cheap-module-source-map' is recommended for speed.

Karma configuration using karma-webpack-with-fast-source-maps with webpack preprocessor, fast source maps, and a single test entry point.

// karma.conf.js module.exports = function(config) { config.set({ browsers: ['ChromeHeadless'], frameworks: ['jasmine'], files: ['test/test_index.js'], preprocessors: { 'test/test_index.js': ['webpack'] }, webpack: { devtool: 'cheap-module-source-map', module: { rules: [ { test: /\.js$/, exclude: /node_modules/, use: 'babel-loader' } ] } }, webpackMiddleware: { noInfo: true }, singleRun: true }); };

Debug

Known issues

deprecatedPackage is deprecated; use karma-webpack v5+ for webpack 4/5 support.

fix

Replace with 'karma-webpack' and update configuration for version 5.

affects: all

breakingIncompatible with webpack 4 and 5. Only supports webpack 1-3.

fix

Upgrade to karma-webpack v4+ for webpack 4 support, or v5+ for webpack 5.

affects: >=1.0

gotchaPreprocessor name is 'webpack' not the package name.

fix

Use 'webpack' as preprocessor name, e.g., preprocessors: { 'test.js': ['webpack'] }.

affects: all

gotchaThe __karmaWebpackManifest__ variable is required in test entry file for selective test running; missing it may cause unexpected behavior.

fix

Ensure test entry file declares var __karmaWebpackManifest__ = []; before using it.

affects: all

breakingNo support for ES modules (ESM) natively; requires Babel or other transpilation.

fix

Add babel-loader or similar to webpack config to transpile ES modules.

affects: all

Errors

Common errors & fixes

Module not found: Error: Can't resolve 'karma-webpack-with-fast-source-maps'

Package not installed or misspelled in npm install.

fix

Run: npm install --save-dev karma-webpack-with-fast-source-maps

Error: Cannot find module 'webpack'

Missing peer dependency webpack.

fix

Run: npm install --save-dev webpack@3 (or compatible version)

TypeError: Cannot read property 'webpack' of undefined

Missing webpack configuration in Karma config.

fix

Add webpack: { ... } to karma.conf.js

Error: 'preprocessors' should be an object

Misplaced preprocessors or incorrect format in karma.conf.js

fix

Ensure preprocessors is a top-level config key with object value: preprocessors: { 'test.js': ['webpack'] }

Upgrade

Version history

1.10.2latest on npm

Audit

Dependencies

webpackrequiredpeer dependency: integrates with webpack (v1 to v3)

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/aaronjensen/karma-webpack ↗

packagehttps://www.npmjs.com/package/karma-webpack-with-fast-source-maps ↗