feat(custom-webpack): export common

[IKatsuba]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[x] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

I need to use only the factory for modification of webpack configuration. But the factory is not exported.

Issue Number: N/A

What is the new behavior?

The factory is exported

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[just-jeb]

Hi @IKatsuba. Would you mind elaborating on your use case? Everything that is exported is part of the public API and should be documented. How do you plan to use it?

[IKatsuba]

Hi @just-jeb. I am creating a builder with built-in index.html transform factories and really want to reuse webpack configuration transform factory from your package

[just-jeb]

Ok. For now I'll merge it as is but maybe it's worth externalizing all the core functionality into a separate package, WDYT?

[IKatsuba]

That would be very useful!