What strategies does NPM/WebPack employ to handle duplicate dependencies across different version ranges?

I am working on an application that relies on various packages, each with its own set of dependencies. For instance, my app may require package@^1.0.0, while another package it uses may demand package@^1.5.1. When I build the app for production, will both packages be included in the final code bundle, or just the latest version within the specified range?

Similarly, how does this apply to using a strict version like 

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b5c5d4d6ded4d2d0f5849b859b85">[email protected]</a>
compared to a range like package@^1.5.1?

I assume that if my app depends on package@^1.0.0 and one of its dependencies requires 

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b6c6d7d5ddd7d1d3f68798869886">[email protected]</a>
, then the same package's code will not be duplicated in the production bundle. Please correct me if I'm mistaken.

javascriptnpmwebpack

Answer №1

When it comes to managing versions and potential conflicts in your bundled JS file, the outcome can vary depending on how strictly you adhere to required versions. For instance, if conflicting versions are specified in your package.json file, you may end up with duplicates of certain libraries in your final bundle. This is a problem I am currently facing with the following dependencies:


Main Project
 - main-ui-scaffolding-library
  - componentB-library @^1.3.0
 - specialty-component-library
  - componentB-library @1.2.0

After bundling my code, I noticed that componentB-library appears twice in the source - once with version @^1.3.0 and once with version @1.2.0. This situation can be frustrating because the last included version will take precedence and be referenced by the variable or AngularJS component/service name. Due to the nature of webpack's dependency tree traversal, determining which version will load last can be unpredictable.

I hope this explanation sheds some light on the issue at hand!

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