DependencyExtractionWebpackPlugin: use compilers webpack instance for filesystem cache compatibility in pnpm monorepos.

[kalessil]

What?

Use the webpack instance available in the compiler instance.

Why?

In pnpm monorepos, peer dependencies can result in packages using the same Webpack version but with different versions of their dependencies. During the build process, this may lead to multiple Webpack instances, which can cause serialization warnings and cache misses when using the Webpack filesystem cache.

How?

Use the webpack instance available in the compiler instance.

Testing Instructions

• CI shall pass
• In details verified in [dev] Monorepo: refresh DependencyExtractionWebpackPlugin for compatibility with filesystem cache, minor build cleanup woocommerce/woocommerce#64111 (release zip changes verification)

Testing Instructions for Keyboard

n/a

Screenshots or screencast

n/a

Use of AI Tools

Claude investigated cache misses and confirmed the issue was resolved following the changes.

[github-actions]

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[github-actions]

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[ObliviousHarmony]

Thanks @kalessil,

This is a great start! As per Webpack's own plugin example, could we remove require( 'webpack' ) entirely in favor of using compiler.webpack?