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Can this be useful when someone uses webpack?

Why would it be any different if they weren't? Unused code is unused code.

Webpack bundles everything up into one huge .js file, I gotta try how it works with that.

Plus in my current environment (ReactJS + TypeScript + MobX + Webpack) tslint generates errors when I have unused variables and that breaks TeamCity build.

No matter what, this tool is super useful!

You can do code splitting with Webpack it's a matter of config and how your code is organized. https://webpack.github.io/docs/code-splitting.html

I think it would be interesting if this works with source-maps, that are created from things like webpack or compilers/transpilers. The unused code which ends-up in the browser might result from unused code in original files which looks slightly differently, and it's interesting where it comes from.

Webpack already does this see: https://webpack.js.org/guides/tree-shaking/

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