message: Show .ts files in testbed chrome debugger tools.
diff: | $Copyright: (c) 2018 Bentley Systems, Incorporated. All rights reserved. $
  *--------------------------------------------------------------------------------------------*/
  const path = require("path");
  +const fs = require("fs");
  const { ipcRenderer, remote } = require("electron");
  global.___IMODELJS_CORE_DIRNAME___ = path.join(__dirname, "..");
  global.___TESTBED_IPC_RENDERER___ = ipcRenderer;
  remote.getCurrentWindow().setTitle("iModelJS Testbed");
  remote.require(path.join(__dirname, "lib/backend/index"));
  -require(path.join(__dirname, "lib/dist/testbed.js"));
  +
  +const jsPath = "lib/dist/testbed.js";
  +require("vm").runInThisContext(fs.readFileSync(jsPath), { filename: "file:///" + path.join(__dirname, jsPath).replace(/\\/g, '/') });
  