@team-griffin/webpack-dedupe-plugin

yarn add --dev @team-griffin/webpack-dedupe-plugin
npm i --save-dev @team-griffin/webpack-dedupe-plugin
pnpm i --save-dev @team-griffin/webpack-dedupe-plugin

Note: This project currently has webpack v4 as a peer dependency

Why?

So node package managers such as yarn & npm cause a tonne of duplicate dependecies across child dependencies when your top level's dependency does not match. An example of this is:

App:
  -- A@2.0.0
  -- B:
    -- A@1.0.0
  -- C:
    -- A@1.0.0

Due to how node's require algorithm works package managers are until to dedupe these packages, therefore you'll end up with 2 instances of A@1.0.0 in your webpack bundle.

Usage

This plugin isn' a traditional webpack plugin due to really being a wrapper around an existing webpack plugin (NormalModuleReplacementPlugin).

const createDedupe = require('@team-griffin/webpack-dedupe-plugin');

...

// webpack plugins
plugins: [
  createDedupe(),
],

How does it work?

We leverage the webpack plugin NormalModuleReplacementPlugin to look at each import and replace any deduplicates with a "master". Currently this only works on exact version matches.