Add transpilation for IE11 and skip linux tests

karma.conf.js

@@ -1,29 +1,30 @@
 // Karma configuration
 
 module.exports = function(config) {
-  var customLaunchers = {};
-  var browsers = [];
-  var useSauce = false;
+  const customLaunchers = {};
+  let browsers = [];
+  let useSauce = false;
+  let transpileToES5 = ['internet explorer'].includes(process.env.TEST_BROWSER_NAME);
 
   // use Sauce when running on Travis
   if (process.env.TRAVIS_JOB_NUMBER) {
     useSauce = true;
-  }
+  } 
 
   if (useSauce && process.env.TEST_BROWSER_NAME && process.env.TEST_BROWSER_NAME != 'PhantomJS') {
-    var names = process.env.TEST_BROWSER_NAME.split(',');
-    var platforms = process.env.TEST_BROWSER_OS.split(',');
-    var versions = [];
-    if (process.env.TEST_BROWSER_VERSION) {
-      versions = process.env.TEST_BROWSER_VERSION.split(',');
-    } else {
-      versions = [null];
-    }
+    const names = process.env.TEST_BROWSER_NAME.split(',');
+    const platforms = process.env.TEST_BROWSER_OS.split(',');
+    const versions = process.env.TEST_BROWSER_VERSION
+      ? process.env.TEST_BROWSER_VERSION.split(',')
+      : [null];
 
-    for (var i = 0; i < names.length; i++) {
-      for (var j = 0; j < platforms.length; j++) {
-        for (var k = 0; k < versions.length; k++) {
-          var launcher_name = 'sl_' + platforms[j].replace(/[^a-zA-Z0-9]/g, '') + '_' + names[i];
+    for (let i = 0; i < names.length; i++) {
+      for (let j = 0; j < platforms.length; j++) {
+        // FIXME Skip tests in Linux since Sauce Labs browser versions are ancient.
+        // https://github.com/novnc/noVNC/pull/1013#issuecomment-382749805
+        if (platforms[j] === 'Linux') continue;
+        for (let k = 0; k < versions.length; k++) {
+          let launcher_name = 'sl_' + platforms[j].replace(/[^a-zA-Z0-9]/g, '') + '_' + names[i];
           if (versions[k]) {
             launcher_name += '_' + versions[k];
           }
@@ -48,7 +49,7 @@ module.exports = function(config) {
     browsers = [];
   }
 
-  var my_conf = {
+  const my_conf = {
 
     // base path that will be used to resolve all patterns (eg. files, exclude)
     basePath: '',
@@ -103,6 +104,7 @@ module.exports = function(config) {
 
     babelPreprocessor: {
       options: {
+        presets: transpileToES5 ? ['es2015'] : [],
         plugins: ['transform-es2015-modules-amd', 'syntax-dynamic-import'],
         sourceMap: 'inline',
       },

package.json

@@ -36,6 +36,7 @@
     "babel-plugin-transform-es2015-modules-commonjs": "^6.18.0",
     "babel-plugin-transform-es2015-modules-systemjs": "^6.22.0",
     "babel-plugin-transform-es2015-modules-umd": "^6.22.0",
+    "babel-preset-es2015": "^6.24.1",
     "babelify": "^7.3.0",
     "browserify": "^13.1.0",
     "chai": "^3.5.0",

utils/use_require.js

@@ -151,6 +151,7 @@ var make_lib_files = function (import_format, source_maps, with_app_dir, only_le
     // NB: we need to make a copy of babel_opts, since babel sets some defaults on it
     const babel_opts = () => ({
         plugins: [`transform-es2015-modules-${import_format}`],
+        presets: ['es2015'],
         ast: false,
         sourceMaps: source_maps,
     });

vendor/browser-es-module-loader/src/babel-worker.js

@@ -6,6 +6,7 @@ import babelTransformES2015ModulesSystemJS from 'babel-plugin-transform-es2015-m
 var babelTransform = require('babel-core').transform;
 var babelTransformDynamicImport = require('babel-plugin-syntax-dynamic-import');
 var babelTransformES2015ModulesSystemJS = require('babel-plugin-transform-es2015-modules-systemjs');
+var babelPresetES2015 = require('babel-preset-es2015');
 
 self.onmessage = function (evt) {
     // transform source with Babel
@@ -17,6 +18,7 @@ self.onmessage = function (evt) {
       sourceMaps: 'inline',
       babelrc: false,
       plugins: [babelTransformDynamicImport, babelTransformES2015ModulesSystemJS],
+      presets: [babelPresetES2015],
     });
 
     self.postMessage({key: evt.data.key, code: output.code, source: evt.data.source});