fix(contribute): fix webpack 4 patterns in plugin-patterns Changed chunks section

[raj-sapalya]

Problem

The "Changed chunks" example contains webpack 4 patterns that break in webpack 5:

1. compilation.chunks.filter() throws a TypeError
compilation.chunks is a Set in webpack 5, not an array. Calling .filter() throws TypeError: compilation.chunks.filter is not a function.

2. chunk.hash is no longer valid
chunk.hash was removed in webpack 5. Using it causes the comparison to always evaluate as changed, so every chunk appears updated on every rebuild.

Changes

• Replace .filter() with for...of iteration
• Replace chunk.hash with chunk.contentHash.javascript
• Use chunk.id ?? chunk.name as the tracking key
• Skip chunks without a JavaScript content hash
• Add warnings explaining the webpack 5 API changes
• Add a tip explaining the key choice and guard

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
webpack-js-org	Ready	Preview, Comment	Apr 4, 2026 6:49pm

[evenstensberg]

use pr template please.

[raj-sapalya]

use pr template please.

Sorry about that! I missed the PR template. Reopening now with the proper format.