Useless function call is not removed by plugin-remove-useless-functions

Hi there 👋
It could be that the plugin I’m looking for exists, but I can’t find the one. I have the next statement:

const test = (fn, value) => {
  return (a => fn(a))(value);
}

const test(console.log, 42);

I want it to be transformed to

const test = (fn, value) => {
  return fn(value);
}

const test(console.log, 42);

I expected that plugin-remove-useless-functions does the thing, but it doesn’t.

What’s the best way I can solve the issue?

[mrkosima]

Just checked how the remove-iife plugin works. Here some extra cases I checked:

1. Unused params

((a) => fn(42))(value);

Result: fn(value) Expected: fn(42) or noTransform().

1. The previous example can be extended with:

((a) => fn(a, 42))(value);

Result: fn(value) Expected: fn(value, 42) or noTransform().

1. Used variables within a function body

((a) => fn({customProp: a.x}))(value);

Result: fn(value) Expected: fn({customProp: value.x}) or noTransform()

What do you think?

[coderaiser]

Just landed to @putout/plugin-remove-iife, it’s more related 😃.

You can try it in 🐊Putout v27.8.0 🎉