feat(es/minifier): Drop redundant function parameters

[levi-nz]

Description:
Trailing parameters in functions/arrow expressions can be dropped if they're not referenced inside the function body without introducing side effects. e.g. function f(a, b, c) {f(a);} -> function f(a) {f(a);}.

This simply iterates (reverse) through the parameters and once it encounters a parameter that is used, it stops and drops the ones it found. If no referenced parameters are found then all parameters can be dropped.

BREAKING CHANGE:

Related issue (if exists):

[changeset-bot]

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Latest commit: 35f8e22

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[levi-nz]

This might break TypeScript interfaces, will have to test

[codspeed-hq]

CodSpeed Performance Report

Merging #9636 will not alter performance

_{Comparing levi-nz:optimize-function-parameters (35f8e22) with main (f2be26e)}

Summary

✅ 194 untouched benchmarks

[kdy1]

I think this should check for option about function.length

[levi-nz]

I think this should check for option about function.length

I think this should be a config option if that's what you're referring to, but I'm not sure what you're referring to regarding function.length

[magic-akari]

I think this should check for option about function.length

I think this should be a config option if that's what you're referring to, but I'm not sure what you're referring to regarding function.length

It's the keep_fargs option in Terser.