When adding a default value to a function, compress / minify can't optimize the function.

[NullVoxPopuli]

Describe the bug

When a function parameter has a default value, and that parameter is not used, the parameter (and consequently the whole function) are not optimized away.

Input code

const defaultMessage = "hello"

// write or paste code here
function x(x) { return x; }
function y(x, y, z) { return x; };

function abc(a) { return x(a); }
function abc2(a, x, z = defaultMessage) { return y(a); }

export function example() {
  // output should be
  // return `2 2 3 3`;
  return `${x(2)} ${y("2")} ${abc(3)} ${abc2("3")}`;
}

Config

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "tsx": false
    },
    "target": "es2022",
    "loose": false,
    "minify": {
      "compress": {
        "arguments": false,
        "arrows": true,
        "booleans": true,
        "booleans_as_integers": false,
        "collapse_vars": true,
        "comparisons": true,
        "computed_props": true,
        "conditionals": true,
        "dead_code": true,
        "directives": true,
        "drop_console": false,
        "drop_debugger": true,
        "evaluate": true,
        "expression": false,
        "hoist_funs": false,
        "hoist_props": true,
        "hoist_vars": false,
        "if_return": true,
        "join_vars": true,
        "keep_classnames": false,
        "keep_fargs": true,
        "keep_fnames": false,
        "keep_infinity": false,
        "loops": true,
        "negate_iife": true,
        "properties": true,
        "reduce_funcs": false,
        "reduce_vars": false,
        "side_effects": true,
        "switches": true,
        "typeofs": true,
        "unsafe": false,
        "unsafe_arrows": false,
        "unsafe_comps": false,
        "unsafe_Function": false,
        "unsafe_math": false,
        "unsafe_symbols": false,
        "unsafe_methods": false,
        "unsafe_proto": false,
        "unsafe_regexp": false,
        "unsafe_undefined": false,
        "unused": true,
        "const_to_let": true,
        "pristine_globals": true,
        "passes": 7
      },
      "mangle": false,
    },
    "transform": {
      "constModules": {"globals": {"debug": {"IS_DEV_MODE": "false"}}}
    }
  },
  "module": {
    "type": "es6"
  },
  "minify": false,
  "isModule": true
}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.7.24&code=H4sIAAAAAAAAA11PSwrCMBTc5xRDcBGhIKTL4hG8g7F9tUJsSj6YWnp3n1q%2Fu3nzY17t%2BhDRUGuSjTsKwRwJW8iOrHVSiM0GF3%2BKBOcxmMCgdg2hI0%2BiTX0dT65HVnmNCZ5i8nxVmD%2FaqHKBscD1z1GJj8ccamW%2Bdb5%2BStiglSnAVVde9zv3KzguQUF5cD7iXUDZnAdLir0C4KdcikOKCJ1LtsGBnuxSs9fQKFHuK6Zf3GrKSq9nrKZRSS0f6D68fCGtZMk0h%2BYbmjyxQlYBAAA%3D&config=H4sIAAAAAAAAA32VPY%2FbMAyG9%2FyKQHOHIkMLdL4r0OHQoUBXQbEoR1dbMkQqlyDwfy8lOx%2BX0NlsPiIpkdSr02q9Vu%2FYqB%2FrE3%2Fyz2ASQrr8swWPgcyBLYqOA2CT%2FEDqy5kSFuRMh1BN40QUmdQCFS%2FAzdfNZvZQXYwIZ4%2FZ1vvg3fE2ZxP7IQHijY2tHDL3EAg%2F%2B88sxY8CKOVb%2BzbGDkx4QrRB7QNBC0kK3MSuMwOC3pskRCk7NcljlFIUmAmsHlIcRB6sJx8D53ykFozVTbQgIJ%2BgIb8HyY1zsVtAPp5wnootbHPb1j7fecPedNmQkBMOtSW8WyHqLnok7XKQSjjBhRpMcC7uvad3OgHlFB793qMPCz35B8AV6AxiMD1IcesKx%2FO05O2eevrgeGTpKHCeb%2BmUAVouqvbeCZUtlYFEXupmApsbKJVtpO3MeKF86C1ocI5nRQiNH56anZS0XPToBMD9NU6aqgnoyy1c4OVCPME%2F%2BZQkD9i8oje0W6Z47Lexe5KgB9pF%2B2QBt4LiMk6sEodhmedggUcDrLgkYwWPIsAXgKLuql4%2BzAZfD46o2y5uRZkYeM5rE7%2FPtvEizr0J7b0IXAQ6sfa5mPrPust7eYs2dzXiSV2znlQVjfr1649%2Bef2r336%2FvBaFr9HVOI5TgtWcRPU10PVtKWM1vQjf1HXRWfwve1Qe386e5ayr8T%2FpkujBpwYAAA%3D%3D

SWC Info output

I'm only using the playground

Expected behavior

Behavior without the default value in the function parameter

When a parameter is unused, it shouldn't matter if it has a default value or not.

Actual behavior

function is not optimized away

Version

1.7.24 and newer (didn't test older)

Additional context

No response

[CPunisher]

I think #9636 may also solve this problem

[NullVoxPopuli]

Commenting again, due to bot-closures #8177 (comment)