Es6 refactor in /lib folder

[Orlandster]

What kind of change does this PR introduce?
Es6 refactor in /lib folder

Did you add tests for your changes?
No

If relevant, link to documentation update:
N/A

Summary
The Refactoring makes the code more consistent to the ES6 standards. issue #4099

Does this PR introduce a breaking change?
No

Other information
Thanks for the review.

[sokra]

Please don't refactor this file. It should be in low level js as it's embedded into the runtime code

[Orlandster]

Thanks for the feedback. I'm very new to the project and it helps me a lot! I will revert the commit and there's also another thing in the ContextModuleFactory.js I have to fix.

[Orlandster]

@sokra Sorry, currently I'm struggling with the CI build error caused by ContextModuleFactory.js. It tells me "Block-scoped declarations (let, const, function, class) not yet supported outside strict mode". Do you have any idea why this happens? It's also failing without all the "const", "let" and "=>" . Seems to be something with the class declaration.

[sokra]

It tells me "Block-scoped declarations (let, const, function, class) not yet supported outside strict mode".

Don't touch the lib/JsonpMainTemplate.runtime.js file.

[webpack-bot]

@Orlandster98 Thanks for your update.

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

@sokra Please review the new changes.

[webpack-bot]

Thank you for your pull request! The most important CI builds succeeded, we’ll review the pull request soon.

[sokra]

Thanks