Use a symbol for the this pointer on wrapped loader classes, see AssemblyScript#363

Author: dcodeIO

lib/loader/index.js

@@ -1,6 +1,7 @@
 "use strict";
 
 const hasBigInt64 = typeof BigUint64Array !== "undefined";
+const thisPtr = Symbol();
 
 /** Gets a string from an U32 and an U16 view on a memory. */
 function getStringImpl(U32, U16, ptr) {
@@ -269,7 +270,7 @@ function demangle(exports, baseModule) {
         };
         ctor.prototype = {};
         ctor.wrap = function(thisValue) {
-          return Object.create(ctor.prototype, { "this": { value: thisValue, writable: false } });
+          return Object.create(ctor.prototype, { [thisPtr]: { value: thisValue, writable: false } });
         };
         if (classElem) Object.getOwnPropertyNames(classElem).forEach(name =>
           Object.defineProperty(ctor, name, Object.getOwnPropertyDescriptor(classElem, name))
@@ -283,8 +284,8 @@ function demangle(exports, baseModule) {
           let getter = exports[internalName.replace("set:", "get:")];
           let setter = exports[internalName.replace("get:", "set:")];
           Object.defineProperty(curr, name, {
-            get: function() { return getter(this.this); },
-            set: function(value) { setter(this.this, value); },
+            get: function() { return getter(this[thisPtr]); },
+            set: function(value) { setter(this[thisPtr], value); },
             enumerable: true
           });
         }
@@ -295,7 +296,7 @@ function demangle(exports, baseModule) {
           Object.defineProperty(curr, name, {
             value: function (...args) {
               setargc(args.length);
-              return elem(this.this, ...args);
+              return elem(this[thisPtr], ...args);
             }
           });
         }