minifier: remove unused specifiers from import statements #16742
Description
input
import a from 'a'
import { b } from 'b'
if (false) {
console.log(b)
}output
import 'a'
import 'b'{{ message }}
input
import a from 'a'
import { b } from 'b'
if (false) {
console.log(b)
}output
import 'a'
import 'b'