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requirejs/requirejs

★ 12,919JavaScriptAudience · developerComplexity · 2/5LicenseSetup · easy

TLDR

A JavaScript module loader that manages loading and sequencing JavaScript file dependencies in the browser using the AMD specification, with a built-in optimizer for production bundling.

Mindmap

mindmap
  root((requirejs))
    What it does
      JS module loader
      Dependency management
      Production bundler
    Tech
      JavaScript
      AMD spec
      Node.js compatible
    Features
      Async file loading
      Optimizer bundler
      Legacy browser support
    Use cases
      Legacy codebases
      Script bundling
      Dependency order
    Audience
      Frontend developers
      Legacy maintainers
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Things people build with this

USE CASE 1

Manage JavaScript file load order and dependencies in an existing web app without a modern bundler.

USE CASE 2

Bundle and minify a collection of JS files into a single optimized file for faster page loads.

USE CASE 3

Add explicit dependency declarations to a legacy codebase using AMD-style module definitions.

Tech stack

JavaScript

Getting it running

Difficulty · easy Time to first run · 30min

Best suited for maintaining existing codebases, new projects should prefer native ES modules or modern bundlers like Vite or webpack.

MIT license, use freely in any project, commercial or personal, with no restrictions beyond keeping the copyright notice.

In plain English

RequireJS is a JavaScript tool that handles loading JavaScript files and modules in a web browser. When you build a web application, you typically end up with many separate JavaScript files that depend on each other in specific orders. RequireJS manages that loading process so that each file is fetched and executed at the right time, without the developer having to manually track and sequence all those dependencies. One of its main characteristics is that it loads files asynchronously, meaning the browser does not have to stop and wait for each file to finish loading before moving on to the next thing. This was an important technique before modern browsers had built-in module systems. RequireJS follows a specification called AMD, which stands for Asynchronous Module Definition, as a standard way for JavaScript files to declare what they depend on. The tool also includes an optimizer. When you are ready to deploy your application, the optimizer can combine all your separate JavaScript files into one or a few larger files and compress them to reduce file size, which improves how quickly the page loads for end users. RequireJS does not require any particular JavaScript framework to work and is compatible with a wide range of browsers, including older ones going back to Internet Explorer 6. It can also run in server-side JavaScript environments like Node.js. It is worth noting that RequireJS was created during an era when browsers lacked native module support. Modern JavaScript now has a built-in module system, so RequireJS is less commonly adopted in new projects today. However, many existing codebases still use it, and the project remains maintained under an MIT license. The repository itself contains the source code, documentation files, and tests.

Copy-paste prompts

Prompt 1
I have a legacy web project with multiple JS files that depend on each other. Show me how to set up RequireJS so I don't have to manually order script tags.
Prompt 2
How do I use the RequireJS optimizer to bundle all my JavaScript files into a single minified file for production deployment?
Prompt 3
I'm migrating a RequireJS codebase to native ES modules. What's the equivalent of define() and require() in native JS module syntax?
Prompt 4
Show me how to configure RequireJS to load jQuery and a jQuery plugin that depends on it, making sure the plugin waits for jQuery to load first.
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