Bug report

Terser is using the same identifier for the function, and for the const defined inside the if. This produces code that can't be evaluated.

Here is a simple reproduction case:

function f1() {
	if (true) {
		function f2() {
			return 1;
		}

		const var1 = 666;
	}
}

If var1 is outside the "if", the correct identifier is used when minifying.

Used options:

{
  module: true,
  compress: {
    unused: false
  }
}

Curent terser output

function n(){{function n(){return 1}const n=666}}

note the inner function n() and the const n, they clash.