[Question] [JSCodeGen] Remove unused Classes / Variables

[Toky Olivier Razanakotonarivo]

Hello @egrange,

Can you tell please how to tell the codegen to remove unused classes/records/variables from the generated JS file. It’s to get the tiniest file size possible for the generated JS file?

Thank you so much

[Eric Grange]

You can reduce file size by using the codegen options cgoSmartLink and cgoDeVirtualize.

The cgoObfuscate & cgoOptimizeForSize option can be used as well to reduce variable names in length as well as redundant whitespace.
If it’s for a final build, the best results can be achieved by passing the JS to Google’s Closure Compiler, on top of cgoSmartLink and cgoDeVirtualize (obfuscation & optimize for size are less relevant when going through the closure compiler).

Another important point is to disable RTTI (with cgoNoRTTI) otherwise a lot of classes will be pulled in, even if unused, because they could be instantiated dynamically through RTTI.

[Toky Olivier Razanakotonarivo]

Okay, thank you so much.