For maintainers only:

• This needs to be documented (issue in webpack/webpack.js.org will be filed when merged)
• This needs to be backported to webpack 4 (issue will be created when merged)

@wizardofhogwarts Thanks for your update.

I labeled the Pull Request so reviewers will review it again.

@sokra Please review the new changes.

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@wizardofhogwarts pls sign CLA

@wizardofhogwarts The most important CI builds failed. This way your PR can't be merged.

Please take a look at the CI results from azure (1 errors / 1 warnings) and appveyor (failure) and fix these issues.

@snitin315 Can you check it and resend PR, thank you