WebWorker stacktrace for debug

webworker-stacktrace.js

//
// In the WebWorker
//
function debug(msg) {                                                           
  postMessage(JSON.stringify({type:'debug',msg:msg}));                          
}

onmessage = function (e) {
  try {

    var inputData = e.data;
    // work on input data
    // ...
    // Calculate answer to the ultimate question
    postMessage(JSON.stringify({type:'response', answer:42}));

  } catch(e) {
    var stack = e.stack.replace(/^[^\(]+?[\n$]/gm, '')
      .replace(/^\s+at\s+/gm, '')
      .replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@')
      .split('\n');
    debug(e+'\n'+stack);
  }
};