Tree shaking next-swc transformation

[padmaia]

Describe the feature you'd like to request

Add an optional next-swc transform to treeshake unused exports

[kdy1]

I think we can use https://docs.rs/swc_ecma_transforms_optimization/0.65.0/swc_ecma_transforms_optimization/simplify/dce/fn.dce.html ?
It does not support configuring items to preserve, but implementing it will not be hard.

Alternatively we can simply remove exports except ones we want to preserve before applying the DCE.

[balazsorban44]

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