Intro to Module Bundlers

Intro to Module Bundlers

Let’s take a intro to how this works in a real project by using the most popular module bundler today, webpack.

All of these tools run on Javascript. In ECMAScript 2015+, you can separate your code into multiple files and import these files into your application when needed to use their functionality. For example, when building a React application you always write import React from 'react' at the top of each JS file.

This functionality isn’t built into browsers by default, so modern code bundlers were built to bring this capability in a couple forms: by asynchronously loading javascript as it’s needed, or by combining all the javascript into a single file that’s loaded via a <script> tag.

Without module bundlers, you would have to manually combine files or load Javascript into HTML with countless <script> tags, which works, but has several key disadvantages:

  • You have to keep track of which code is needed and the proper load order
  • Multiple <script> tags means more calls to the server, worsening performance
  • Tons of manual work

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