Large numeric literals are emitted as Infinity / -Infinity instead of remaining as they are.

[lucacasonato]

Describe the bug

Roundtripping an AST containing the code below, the output contains -Infinity instead of -1e999. I think the output should remain as -1e999.

Input code

const x = -1e999;

Config

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "tsx": false
    },
    "target": "es2022",
    "loose": false,
    "minify": {
      "compress": false,
      "mangle": false
    },
    "transform": {
      "react": {
        "importSource": "npm:react",
        "runtime": "automatic"
      }
    }
  },
  "module": {
    "type": "es6"
  },
  "minify": false,
  "isModule": true
}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.6.7&code=H4sIAAAAAAAAA0vOzysuUahQsFXQNUy1tLS0BgAenTgBEQAAAA%3D%3D&config=H4sIAAAAAAAAA21QOw7CMAzde4rKMwPqwMAdmDiBFVwU1HxkOxJV1buTtA0tEksUv4%2Bf7alpW3iJgWs75W8uIrIQf%2BuMyOgV3xkBHSOJYRsVTpVVKVSPg9ACzSsDivwkLS6S7tx1mwOGEISqY8Oc9bYfj5kmuMgk8issUvTPgf4nMnrpA7tjIyY0egAyZF0MrPeQ2JRG4KO7rrLTLuLk1bqFx6TBoVoDGz039V2iwYVHWmbaTljOtC5%2BgV1Ud%2FzuA1Zu1amcqJk%2FtsEHsI4BAAA%3D

SWC Info output

No response

Expected behavior

const x = -1e999;

Actual behavior

const x = -Infinity;

Version

1.6.7

Additional context

No response

[magic-akari]

Are you currently writing custom DTS codegen?
I believe you can extract data from the raw data of the Number.

SWC AST Viewer

[kdy1]

Guide for GFI

The problematic logic is

swc/crates/swc_ecma_codegen/src/lib.rs

Lines 705 to 713 in 260f806

	// Handle infinity
	if num.value.is_infinite() {
	if num.value.is_sign_negative() {
	self.wr.write_str_lit(num.span, "-")?;
	}
	self.wr.write_str_lit(num.span, "Infinity")?;
	return Ok(false);
	}

We can move code for using raw before the code checking infinity

[imranbarbhuiya]

Guide for GFI

The problematic logic is

swc/crates/swc_ecma_codegen/src/lib.rs

Lines 705 to 713 in 260f806

	// Handle infinity
	if num.value.is_infinite() {
	if num.value.is_sign_negative() {
	self.wr.write_str_lit(num.span, "-")?;
	}
	self.wr.write_str_lit(num.span, "Infinity")?;
	return Ok(false);
	}

We can move code for using raw before the code checking infinity

Hi, I'm working on this, how can I test the changes in windows?