--- a/Platforms/Wasm/default-library.js	Mon Apr 29 14:40:01 2019 +0200
+++ b/Platforms/Wasm/default-library.js	Mon Apr 29 15:09:48 2019 +0200
@@ -1,21 +1,49 @@
 // this file contains the JS method you want to expose to C++ code
 
 mergeInto(LibraryManager.library, {
+
   ScheduleWebViewportRedrawFromCpp: function(cppViewportHandle) {
     window.ScheduleWebViewportRedraw(cppViewportHandle);
   },
+
   CreateWasmViewportFromCpp: function(htmlCanvasId) {
     return window.CreateWasmViewport(htmlCanvasId);
   },
+
   // each time the StoneApplication updates its status, it may signal it 
   // through this method. i.e, to change the status of a button in the web interface
   UpdateStoneApplicationStatusFromCppWithString: function(statusUpdateMessage) {
     var statusUpdateMessage_ = UTF8ToString(statusUpdateMessage);
     window.UpdateWebApplicationWithString(statusUpdateMessage_);
   },
+
   // same, but with a serialized message
   UpdateStoneApplicationStatusFromCppWithSerializedMessage: function(statusUpdateMessage) {
     var statusUpdateMessage_ = UTF8ToString(statusUpdateMessage);
     window.UpdateWebApplicationWithSerializedMessage(statusUpdateMessage_);
+  },
+
+  // These functions are called from C++ (through an extern declaration) 
+  // and call the standard logger that, here, routes to the console.
+
+  stone_console_error : function(message) {
+    var text = UTF8ToString(message);
+    window.errorFromCpp(text);
+  },
+
+  stone_console_warning : function(message) {
+    var text = UTF8ToString(message);
+    window.warningFromCpp(text);
+  },
+
+  stone_console_info: function(message) {
+    var text = UTF8ToString(message);
+    window.infoFromCpp(text);
+  },
+  
+  stone_console_trace : function(message) {
+    var text = UTF8ToString(message);
+    window.debugFromCpp(text);
   }
+
 });