fix parsing number literals large enough to be perceived as Infinity

fabiosantoscode · fabiosantoscode · commit 8392f62fe880 · 2026-03-13T14:15:57.000Z
diff --git a/lib/parse.js b/lib/parse.js
@@ -101,6 +101,7 @@ import {
     AST_If,
     AST_Import,
     AST_ImportMeta,
+    AST_Infinity,
     AST_IterationStatement,
     AST_Label,
     AST_LabeledStatement,
@@ -2313,12 +2314,22 @@ function parse($TEXT, options) {
             ret = _make_symbol(AST_SymbolRef);
             break;
           case "num":
-            ret = new AST_Number({
-                start: tok,
-                end: tok,
-                value: tok.value,
-                raw: LATEST_RAW
-            });
+            if (tok.value === Infinity) {
+                // very large float values are parsed as Infinity
+                ret = new AST_Infinity({
+                    start: tok,
+                    end: tok,
+                    value: tok.value,
+                    raw: LATEST_RAW
+                });
+            } else {
+                ret = new AST_Number({
+                    start: tok,
+                    end: tok,
+                    value: tok.value,
+                    raw: LATEST_RAW
+                });
+            }
             break;
           case "big_int":
             ret = new AST_BigInt({
diff --git a/test/compress/numbers.js b/test/compress/numbers.js
@@ -304,3 +304,13 @@ numeric_separator_double_underscore: {
         message: "Only one underscore is allowed as numeric separator"
     })
 }
+
+large_numbers_converted_to_infinity: {
+    input: {
+        console.log(Infinity),console.log(1e500),console.log(-1e500);
+    }
+    expect: {
+        console.log(1/0),console.log(1/0),console.log(-1/0);
+    }
+    expect_stdout: true
+}
