javascript-obfuscator · sanex3339 · Nov 29, 2025 · Nov 29, 2025
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,7 @@ v4.1.2
 * Fix `controlFlowFlattening` + optional chaining compatibility. Fixes https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1325
 * Don't obfuscate import.meta.*. Fixes https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1267
 * Revert `Improved stringArray calls wrapper templates` commit. Fixes https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1330
+* Fix error when ClassExpression is the CallExpression callee. Fixes https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1132
 * Don't publish root index.ts files to NPM. Fixes https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1252
 * Update `class-validator` version. Fixes https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1324
 * Update other dependencies

diff --git a/package.json b/package.json
@@ -21,7 +21,7 @@
   },
   "types": "typings/index.d.ts",
   "dependencies": {
-    "@javascript-obfuscator/escodegen": "2.3.0",
+    "@javascript-obfuscator/escodegen": "2.3.1",
     "@javascript-obfuscator/estraverse": "5.4.0",
     "acorn": "8.15.0",
     "assert": "2.1.0",

diff --git a/test/functional-tests/javascript-obfuscator/JavaScriptObfuscator.spec.ts b/test/functional-tests/javascript-obfuscator/JavaScriptObfuscator.spec.ts
@@ -1049,6 +1049,28 @@ describe('JavaScriptObfuscator', () => {
             });
         });
 
+        // https://github.com/javascript-obfuscator/javascript-obfuscator/issues/1132
+        describe('CallExpression ClassExpression crash fix', () => {
+            const regExp: RegExp = /try *\{!class *\{} *\(\);} *catch *\{}/;
+
+            let obfuscatedCode: string;
+
+            beforeEach(() => {
+                const code: string = readFileAsString(__dirname + '/fixtures/call-expression-class-expression.js');
+
+                obfuscatedCode = JavaScriptObfuscator.obfuscate(
+                    code,
+                    {
+                        ...NO_ADDITIONAL_NODES_PRESET
+                    }
+                ).getObfuscatedCode();
+            });
+
+            it('should not throw', () => {
+                assert.match(obfuscatedCode, regExp);
+            });
+      });
+
         describe('mangled identifier names generator', () => {
             const regExp: RegExp = /var c *= *0x1/;
 

diff --git a/test/functional-tests/javascript-obfuscator/fixtures/call-expression-class-expression.js b/test/functional-tests/javascript-obfuscator/fixtures/call-expression-class-expression.js
@@ -0,0 +1 @@
+try { ! class { } ( ) ; } catch { }
diff --git a/yarn.lock b/yarn.lock
@@ -329,10 +329,10 @@
   resolved "https://registry.yarnpkg.com/@istanbuljs/schema/-/schema-0.1.3.tgz#e45e384e4b8ec16bce2fd903af78450f6bf7ec98"
   integrity sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==
 
-"@javascript-obfuscator/escodegen@2.3.0":
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/@javascript-obfuscator/escodegen/-/escodegen-2.3.0.tgz#ff7eb7f8a7c004532e93b14ae8b2196dcf9a1a9e"
-  integrity sha512-QVXwMIKqYMl3KwtTirYIA6gOCiJ0ZDtptXqAv/8KWLG9uQU2fZqTVy7a/A5RvcoZhbDoFfveTxuGxJ5ibzQtkw==
+"@javascript-obfuscator/escodegen@2.3.1":
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/@javascript-obfuscator/escodegen/-/escodegen-2.3.1.tgz#a534e73740830d6c7546ca686773b40b09a6b9d1"
+  integrity sha512-Z0HEAVwwafOume+6LFXirAVZeuEMKWuPzpFbQhCEU9++BMz0IwEa9bmedJ+rMn/IlXRBID9j3gQ0XYAa6jM10g==
   dependencies:
     "@javascript-obfuscator/estraverse" "^5.3.0"
     esprima "^4.0.1"