webpack v5 compatibility

[chenxsan]

Library Affected:

• workbox-webpack-plugin

Browser & Platform:

None

Issue or Feature Request Description:

webpack 5 exposes webpack-sources via webpack.sources, and it's advised to use it instead of require('webpack-sources'), if you agree to do it, I can submit a pull request.

[jeffposnick]

There's a number of non-trivial changes that are needed for webpack v5 compatibility. (C.f. webpack/webpack#11425)

I'm working on implemented all of those changes in the Workbox v6 branch, hopefully in time for the next Workbox pre-release.

[chaffeqa]

great to hear! we just moved to webpack 5 and had to remove workbox since it was causing the build to error out.

[chaffeqa]

the WP5 branch is looking really good! would love to give it a test drive for you!

[jeffposnick]

This is now live as part of the v6.0.0-alpha.3 release: https://github.com/GoogleChrome/workbox/releases/tag/v6.0.0-alpha.3