July 2016
Intermediate to advanced
274 pages
6h 11m
English
Content preview from Modular Programming with JavaScriptBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CommonJS
As with AMD format, CommonJS (also known as CJS) is another format which defines JavaScript modules as objects that can be made available to any dependent code. CJS modules can only define objects, as opposed to AMD modules, which can define constructors and functions too.
Unlike AMD format, which takes a browser-first approach, CommonJS takes a server-first approach. It also covers a broader set of concerns which are server-related, such as io, file system, and alike.
Many developers (I'm one of them) use AMD format for browser-targeted modules and CommonJS for server-side targeted modules. However, you could use CJS format for browser modules as well.
Some of the tools that support CJS for the browsers are:
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