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wtf is css-loader?

gaearon/css-loader — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2016-12-07

★ 2JavaScriptAudience · developerComplexity · 2/5DormantSetup · easy

TL;DR

A webpack loader that lets you import CSS files like JavaScript modules, resolving asset URLs and supporting scoped CSS Modules.

Mindmap

mindmap
  root((repo))
    What it does
      Import CSS as modules
      Resolve url and import
      Bundle images and fonts
    Tech stack
      JavaScript
      Webpack
      CSS Modules
    Use cases
      Bundle stylesheets with JS
      Scope class names locally
      Compose CSS classes
    Audience
      Frontend developers
      React and Vue teams
    Pairs with
      style-loader
      file-loader
      postcss-loader

Code map

Detail Auto

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filefunction / class

Why would anyone build with this?

REASON 1

Import CSS files directly into JavaScript modules in a webpack build.

REASON 2

Scope CSS class names locally with CSS Modules to avoid naming collisions.

REASON 3

Automatically bundle images and fonts referenced inside CSS via url().

REASON 4

Compose styles from one CSS class into another across files.

What's in the stack?

JavaScriptWebpackCSS Modules

How it stacks up

gaearon/css-loader3imed-jaberi/cryptography-si-isamm3imed-jaberi/koa-isomorphic-router
Stars222
LanguageJavaScriptJavaScriptJavaScript
Last pushed2016-12-072021-09-252021-02-06
MaintenanceDormantDormantDormant
Setup difficultyeasyeasyeasy
Complexity2/51/52/5
Audiencedeveloperresearcherdeveloper

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

How do you spin it up?

Difficulty · easy Time to first run · 30min

Requires an existing webpack config to add the loader to.

Yoink these prompts

Prompt 1
Show me how to configure css-loader with style-loader in a webpack config for a React project.
Prompt 2
Explain how CSS Modules local scoping works in this loader and how class names get renamed.
Prompt 3
Help me set up css-loader alongside postcss-loader to preprocess my stylesheets.
Prompt 4
Walk me through how this loader converts a url(image.png) reference into something webpack can bundle.

Frequently asked questions

wtf is css-loader?

A webpack loader that lets you import CSS files like JavaScript modules, resolving asset URLs and supporting scoped CSS Modules.

What language is css-loader written in?

Mainly JavaScript. The stack also includes JavaScript, Webpack, CSS Modules.

Is css-loader actively maintained?

Dormant — no commits in 2+ years (last push 2016-12-07).

How hard is css-loader to set up?

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

Who is css-loader for?

Mainly developer.

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