define doesn't seem to trigger code elimination?

Using this command npx tsup ./x.ts --define.process.platform \"linux\" --minify and the following file.

const _platform = process.platform;
const _linux = (_platform === 'linux');
const _darwin = (_platform === 'darwin');
const _windows = (_platform === 'win32');
const _freebsd = (_platform === 'freebsd');
const _openbsd = (_platform === 'openbsd');
const _netbsd = (_platform === 'netbsd');
const _sunos = (_platform === 'sunos');

if (_platform === 'linux') console.log('linux');

// The following should be removed?
if (_windows) console.log('windows');
if (_freebsd || _darwin) console.log('freebsd or mac?');

We end up with this.

var o="linux";var n=o==="darwin",s=o==="win32",e=o==="freebsd";o==="linux"&&console.log("linux");s&&console.log("windows");(e||n)&&console.log("freebsd or mac?");

I was expecting the following since all of the vars could be resolved to true/false and then can be removed resulting in only the linux code.

console.log("linux");

[egoist]

You should inline the expression:

if (process.platform === 'windows') {
  console.log('windows')
}

[egoist]

Yeah, I guess it’s more complex than it seems for minifiers to implement optimizations like that.