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wtf is core-js-webpack-plugin?

patrickjs/core-js-webpack-plugin — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2016-08-21

★ 16JavaScriptAudience · developerComplexity · 2/5DormantSetup · moderate

TL;DR

A Webpack plugin that builds a trimmed-down core-js polyfill bundle with only the features you specify.

Mindmap

mindmap
  root((repo))
    What it does
      Trims core-js polyfills
      Builds custom bundle
      Reduces bundle size
    Tech stack
      JavaScript
      Webpack
      core-js
    Use cases
      Shrink production bundles
      Avoid unused polyfills
      Build lightweight libraries
    Audience
      Developers
      Library authors

Code map

Detail Auto

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filefunction / class

Why would anyone build with this?

REASON 1

Reduce your app's JavaScript bundle size by including only needed core-js polyfills.

REASON 2

Avoid shipping unnecessary polyfills to users on slow connections.

REASON 3

Build a library without forcing consumers to adopt all of core-js.

REASON 4

Configure UMD output or avoid global namespace pollution for library builds.

What's in the stack?

JavaScriptWebpackcore-js

How it stacks up

patrickjs/core-js-webpack-pluginakaakshat246/ecoscore-browser-extensionanalysis-tools-dev/website-old
Stars161616
LanguageJavaScriptJavaScriptJavaScript
Last pushed2016-08-21—2023-04-06
MaintenanceDormant—Dormant
Setup difficultymoderatehardeasy
Complexity2/53/51/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · moderate Time to first run · 30min

Requires an existing Webpack build and careful listing of needed features to avoid runtime errors.

Yoink these prompts

Prompt 1
Help me configure core-js-webpack-plugin to include only the ES6 features I need.
Prompt 2
Explain how to blacklist specific core-js modules with this plugin.
Prompt 3
Show me how to set up UMD output using this plugin for a library I'm building.
Prompt 4
Walk me through integrating this plugin into my existing Webpack config.

Frequently asked questions

wtf is core-js-webpack-plugin?

A Webpack plugin that builds a trimmed-down core-js polyfill bundle with only the features you specify.

What language is core-js-webpack-plugin written in?

Mainly JavaScript. The stack also includes JavaScript, Webpack, core-js.

Is core-js-webpack-plugin actively maintained?

Dormant — no commits in 2+ years (last push 2016-08-21).

How hard is core-js-webpack-plugin to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is core-js-webpack-plugin for?

Mainly developer.

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