Registry / testing / karma-babel-polyfill

karma-babel-polyfill

library0.0.5jsnpmunverified

A Karma plugin that injects babel-polyfill into the test browser environment, ensuring that ES2015+ APIs (e.g., Promise, Map, Set) are available when running tests with Karma. Version 0.0.5 is the final release; the package has not been updated since 2016 and is considered deprecated in favor of using @babel/polyfill or @babel/regenerator directly with Karma's configuration. It requires karma as a peer dependency and is designed for use with older Babel 6 setups.

testing

npm install karma-babel-polyfill

github ↗package ↗

INSTALL

IMPORT

SIG · KARMA-BABEL-POLYFI

karma-babel-polyfill

testingjavascriptv0.0.5

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

✓ module.exports = require('karma-babel-polyfill');

✗ import karmaBabelPolyfill from 'karma-babel-polyfill';

This package is CommonJS-only and does not provide an ESM export.

frameworks

✓ frameworks: ['babel-polyfill']

✗ frameworks: ['karma-babel-polyfill']

In karma.conf.js, add the string 'babel-polyfill' to the frameworks array; do not use the package name.

plugins

✓ plugins: ['karma-babel-polyfill']

✗ plugins: [require('karma-babel-polyfill')]

Alternatively, the package can be listed in the plugins array if not auto-loaded.

Configures Karma to use babel-polyfill so that ES2015 features are available in test browsers.

// karma.conf.js module.exports = function(config) { config.set({ frameworks: ['mocha', 'babel-polyfill'], // Add 'babel-polyfill' files: ['test/**/*.js'], preprocessors: { 'test/**/*.js': ['babel'] }, babelPreprocessor: { options: { presets: ['env'] } }, plugins: ['karma-babel-polyfill', 'karma-mocha', 'karma-chrome-launcher', 'karma-babel-preprocessor'], browsers: ['ChromeHeadless'], singleRun: true }); }; // Install: npm install --save-dev karma-babel-polyfill karma karma-mocha karma-chrome-launcher karma-babel-preprocessor babel-preset-env

Debug

Known issues

deprecatedPackage has not been updated since 2016 and relies on deprecated babel-polyfill which is no longer maintained.

fix

Migrate to using @babel/polyfill or @babel/regenerator with Karma's single-run mode, or use core-js directly.

affects: >=0.0.1

gotchaFrameworks entry must be 'babel-polyfill' not 'karma-babel-polyfill'

fix

In karma.conf.js, set frameworks: ['babel-polyfill']

affects: >=0.0.1

gotchaThe package only provides CommonJS module; cannot be imported via ES import.

fix

Use require() or list in karma.conf.js as string.

affects: >=0.0.1

breakingOnly works with Babel 6; not compatible with Babel 7 or @babel/core.

fix

Update to @babel/polyfill and corresponding Karma plugins.

affects: >=0.0.1

Errors

Common errors & fixes

Error: Cannot find module 'karma-babel-polyfill'

Package not installed or not listed in plugins array in karma.conf.js.

fix

Run: npm install --save-dev karma-babel-polyfill
Then add 'karma-babel-polyfill' to the plugins array in karma.conf.js.

TypeError: babelPolyfill is not a function

Incorrect usage of the module via import or require in wrong context.

fix

Do not manually call require('karma-babel-polyfill') in config; instead use the string 'babel-polyfill' in the frameworks array.

ReferenceError: regeneratorRuntime is not defined

babel-polyfill may not be loaded before test files; also may need add regenerator runtime.

fix

Ensure 'babel-polyfill' is in frameworks array. If using async/await, consider using @babel/plugin-transform-runtime.

Upgrade

Version history

0.0.5latest on npm

Audit

Dependencies

karmarequiredpeer dependency required for plugin to function

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/jaganathanb/karma-babel-polyfill ↗

packagehttps://www.npmjs.com/package/karma-babel-polyfill ↗