Add void feature to the compiler

Sources/Fuzzilli/Compiler/Compiler.swift

@@ -988,6 +988,13 @@ public class JavaScriptCompiler {
             if unaryExpression.operator == "typeof" {
                 return emit(TypeOf(), withInputs: [argument]).output
             }
+
+            // Handle `void` operator
+            if unaryExpression.operator == "void" {
+                // Emit a UnaryOperation for the void operator
+                return emit(UnaryOperation(.Void), withInputs: [argument]).output
+            }
+
             guard let op = UnaryOperator(rawValue: unaryExpression.operator) else {
                 throw CompilerError.invalidNodeError("invalid unary operator: \(unaryExpression.operator)")
             }

Sources/Fuzzilli/Protobuf/operations.pb.swift

@@ -1,5 +1,6 @@
 // DO NOT EDIT.
 // swift-format-ignore-file
+// swiftlint:disable all
 //
 // Generated by the Swift generator plugin for the protocol buffer compiler.
 // Source: operations.proto
@@ -21,7 +22,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import Foundation
 import SwiftProtobuf
 
 // If the compiler emits an error on this type, it is because this file

Sources/Fuzzilli/Protobuf/program.pb.swift

@@ -1,5 +1,6 @@
 // DO NOT EDIT.
 // swift-format-ignore-file
+// swiftlint:disable all
 //
 // Generated by the Swift generator plugin for the protocol buffer compiler.
 // Source: program.proto

Sources/Fuzzilli/Protobuf/sync.pb.swift

@@ -1,5 +1,6 @@
 // DO NOT EDIT.
 // swift-format-ignore-file
+// swiftlint:disable all
 //
 // Generated by the Swift generator plugin for the protocol buffer compiler.
 // Source: sync.proto

Tests/FuzzilliTests/CompilerTests/basic_void.js

@@ -0,0 +1,10 @@
+const test = void 1;
+console.log(test);
+// Expected output: undefined
+
+void console.log('expression evaluated');
+// Expected output: "expression evaluated"
+
+void (function iife() {
+  console.log('iife is executed');
+})();