simplify vm constructor instrumentation

packages/datadog-instrumentations/src/vm.js

@@ -10,32 +10,27 @@ addHook({ name: names }, function (vm) {
   vm.Script = class extends vm.Script {
     constructor (code) {
       super(...arguments)
-      this.code = code
+
+      if (runScriptStartChannel.hasSubscribers && code) {
+        runScriptStartChannel.publish({ code })
+      }
     }
   }
 
-  shimmer.wrap(vm.Script.prototype, 'runInContext', wrapVMMethod(1))
-  shimmer.wrap(vm.Script.prototype, 'runInNewContext', wrapVMMethod())
-  shimmer.wrap(vm.Script.prototype, 'runInThisContext', wrapVMMethod())
-
-  shimmer.wrap(vm, 'runInContext', wrapVMMethod())
-  shimmer.wrap(vm, 'runInNewContext', wrapVMMethod())
-  shimmer.wrap(vm, 'runInThisContext', wrapVMMethod())
-  shimmer.wrap(vm, 'compileFunction', wrapVMMethod())
+  shimmer.wrap(vm, 'runInContext', wrapVMMethod)
+  shimmer.wrap(vm, 'runInNewContext', wrapVMMethod)
+  shimmer.wrap(vm, 'runInThisContext', wrapVMMethod)
+  shimmer.wrap(vm, 'compileFunction', wrapVMMethod)
 
   return vm
 })
 
-function wrapVMMethod (codeIndex = 0) {
-  return function wrap (original) {
-    return function wrapped () {
-      const code = arguments[codeIndex] ? arguments[codeIndex] : this.code
-
-      if (runScriptStartChannel.hasSubscribers && code) {
-        runScriptStartChannel.publish({ code })
-      }
-
-      return original.apply(this, arguments)
+function wrapVMMethod (original) {
+  return function wrappedVMMethod (code) {
+    if (runScriptStartChannel.hasSubscribers && code) {
+      runScriptStartChannel.publish({ code })
     }
+
+    return original.apply(this, arguments)
   }
 }