Identity function should be inlined

[michens]

Feature request

In TypeScript, it's frequently convenient to write an identity function to simplify type conversions.
Unfortunately, the definitions and calls continue to remain after invoking Terser.
Is it possible to get Terser to optimize this case?

Version (complete output of terser -V or specific git commit)
4.4.0

Complete CLI command or minify() options used

{}

Also tried explicitly setting inline:

{
  compress: {
    inline: true
  }
}

terser input

const id = x => x;
const repro = [id(1), id(2)];
console.log(repro);

terser output or error

const id=o=>o,repro=[id(1),id(2)];console.log(repro);

Expected result

const repro=[1,2];console.log(repro);

or even:

console.log([1,2])

[fabiosantoscode]

Sounds like a great idea! I love the identity function but in this case I'm not sad to see it go