Clear and concise description of the problem

I found a lot of places with require("webpack/lib/something"), they are private and can be changed (moved to other directory, renamed, etc). There is a public API under compiler.webpack.something and it is a stable API and will not changed between versions.

Ref: webpack/webpack#20985

We can add more things if something missed in compiler.webpack, feel free to list here and we will add them

Suggested solution

Don't use private methods.

Alternative

No response

Additional context

No response

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.