From 91cd655cfcde5496f82a9634368ebb67ffd5a023 Mon Sep 17 00:00:00 2001
From: Rong Bao <rong.bao@csmantle.top>
Date: Tue, 15 Sep 2026 18:32:33 +0800
Subject: [PATCH] [parser] Support BigIntLiteral in visitMemberKey

This enables parsing of BigIntLiteral-keyed properties, methods, and
destructuring bindings, for example:

        ({1n: 0});
        class C { 1n(){} }
        for (const {1n: x} of [{}]) {}
---
 Sources/Fuzzilli/Compiler/Parser/parser.js    |  2 ++
 .../CompilerTests/bigint_literal_prop_keys.js | 33 +++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 Tests/FuzzilliTests/CompilerTests/bigint_literal_prop_keys.js

diff --git a/Sources/Fuzzilli/Compiler/Parser/parser.js b/Sources/Fuzzilli/Compiler/Parser/parser.js
index 5a447d0ad..ff5dc63e9 100644
--- a/Sources/Fuzzilli/Compiler/Parser/parser.js
+++ b/Sources/Fuzzilli/Compiler/Parser/parser.js
@@ -256,6 +256,8 @@ function parse(script, proto) {
                 body.index = member.key.value;
             } else if (member.key.type === 'StringLiteral') {
                 body.name = member.key.value;
+            } else if (member.key.type === 'BigIntLiteral') {
+                body.name = member.key.value;
             } else if (member.key.type === 'PrivateName') {
                 assert(member.key.id.type === 'Identifier', "Expected private name ID to be an Identifier");
                 body.privateName = member.key.id.name;
diff --git a/Tests/FuzzilliTests/CompilerTests/bigint_literal_prop_keys.js b/Tests/FuzzilliTests/CompilerTests/bigint_literal_prop_keys.js
new file mode 100644
index 000000000..731ca4d98
--- /dev/null
+++ b/Tests/FuzzilliTests/CompilerTests/bigint_literal_prop_keys.js
@@ -0,0 +1,33 @@
+if (typeof output === "undefined") output = console.log;
+
+const obj1 = { 42n: 42 };
+output(obj1[42n]);
+output(obj1["42"]);
+output(Object.keys(obj1).length);
+
+const obj2 = { 1: 1, 1n: 2n, "1": "3" };
+output(Object.keys(obj2).length);
+output(obj2[1n]);
+
+const obj3 = {
+  get 3n() {
+    return 3;
+  },
+  set 3n(v) {},
+};
+obj3[3n] = 42;
+output(obj3[3n]);
+
+class C {
+  static 2n() {
+    return 2;
+  }
+  1n() {
+    return 1;
+  }
+}
+output(C[2n]());
+output(new C()[1n]());
+
+let { 1n: x } = { 1n: "big" };
+output(x);