Fix: formatting in prepareStackTrace when error isn't of instance Error

console.trace sends on object with name and message instead of an Error,
thus rendering the function unusable due to erroneous message output of
"[object Object]". This fixes #195

Author: legraphista

source-map-support.js

@@ -384,14 +384,18 @@ function wrapCallSite(frame) {
 }
 
 // This function is part of the V8 stack trace API, for more info see:
-// http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
+// https://v8.dev/docs/stack-trace-api
 function prepareStackTrace(error, stack) {
   if (emptyCacheBetweenOperations) {
     fileContentsCache = {};
     sourceMapCache = {};
   }
 
-  return error + stack.map(function(frame) {
+  var name = error.name || 'Error';
+  var message = error.message || '';
+  var errorString = name + ": " + message;
+
+  return errorString + stack.map(function(frame) {
     return '\n    at ' + wrapCallSite(frame);
   }).join('');
 }