fix(es/codegen): Fix codegen of a negative number

crates/swc_ecma_codegen/src/lib.rs

@@ -3652,7 +3652,11 @@ fn minify_number(num: f64) -> String {
     let mut original = printed.clone();
 
     if num.fract() == 0.0 && (i64::MIN as f64) <= num && num <= (i64::MAX as f64) {
-        let hex = format!("{:#x}", num as i64);
+        let hex = format!(
+            "{}{:#x}",
+            if num.is_sign_negative() { "-" } else { "" },
+            num as i64
+        );
 
         if hex.len() < printed.len() {
             printed = hex;

crates/swc_ecma_codegen/tests/fixture/issue-5912/output.js

@@ -0,0 +1,31 @@
+function te(a) {
+    var b, c, d, e, f;
+    if (isNaN(a)) {
+        return Qe(), Pe;
+    }
+    if (a < -9223372036854775808) {
+        return Qe(), Ne;
+    }
+    if (a >= 9223372036854775807) {
+        return Qe(), Me;
+    }
+    e = false;
+    if (a < 0) {
+        e = true;
+        a = -a;
+    }
+    d = 0;
+    if (a >= 17592186044416) {
+        d = Bc(a / 17592186044416);
+        a -= d * 17592186044416;
+    }
+    c = 0;
+    if (a >= 4194304) {
+        c = Bc(a / 4194304);
+        a -= c * 4194304;
+    }
+    b = Bc(a);
+    f = de(b, c, d);
+    e && je(f);
+    return f;
+}