fix(launcher) Ignore uncaught exceptions from webdriver. (#3608)

Author: heathkit

lib/config.ts

@@ -457,6 +457,12 @@ export interface Config {
      */
     untrackOutstandingTimeouts?: boolean;
 
+    /**
+     * If set, Protractor will ignore uncaught exceptions instead of exiting
+     * without an error code. The exceptions will still be logged as warnings.
+     */
+    ignoreUncaughtExceptions?: boolean;
+
     // ---------------------------------------------------------------------------
     // ----- The test framework
     // --------------------------------------------------

lib/launcher.ts

@@ -185,6 +185,13 @@ let initFn = function(configFile: string, additionalConfig: Config) {
 
         process.on('uncaughtException', (exc: (Error|string)) => {
           let e = (exc instanceof Error) ? exc : new Error(exc);
+          if (config.ignoreUncaughtExceptions) {
+            // This can be a sign of a bug in the test framework, that it may
+            // not be handling WebDriver errors properly. However, we don't
+            // want these errors to prevent running the tests.
+            logger.warn('Ignoring uncaught error ' + exc);
+            return;
+          }
 
           let errorCode = ErrorHandler.parseError(e);
           if (errorCode) {