diff --git a/__tests__/html/offlineUI.fatalError.html b/__tests__/html/offlineUI.fatalError.html
index 8534431fe2..9badf57496 100644
--- a/__tests__/html/offlineUI.fatalError.html
+++ b/__tests__/html/offlineUI.fatalError.html
@@ -15,7 +15,7 @@
   <body>
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, shareObservable, timeouts, token } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/offlineUI.firstConnect.html b/__tests__/html/offlineUI.firstConnect.html
index 0d547611d4..3d52bffafd 100644
--- a/__tests__/html/offlineUI.firstConnect.html
+++ b/__tests__/html/offlineUI.firstConnect.html
@@ -16,7 +16,7 @@
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="https://unpkg.com/lolex@4/lolex.js"></script>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, shareObservable, timeouts, token } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/offlineUI.invalidCredentials.html b/__tests__/html/offlineUI.invalidCredentials.html
index f5a9efc557..ecd03e4cc2 100644
--- a/__tests__/html/offlineUI.invalidCredentials.html
+++ b/__tests__/html/offlineUI.invalidCredentials.html
@@ -15,7 +15,7 @@
   <body>
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, timeouts } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/offlineUI.networkInterrupt.html b/__tests__/html/offlineUI.networkInterrupt.html
index 308d66c4a4..2afefdf5c1 100644
--- a/__tests__/html/offlineUI.networkInterrupt.html
+++ b/__tests__/html/offlineUI.networkInterrupt.html
@@ -16,7 +16,7 @@
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="https://unpkg.com/lolex@4/lolex.js"></script>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, shareObservable, timeouts, token } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/offlineUI.sendFailed.noAck.html b/__tests__/html/offlineUI.sendFailed.noAck.html
index 3a34aa3c8b..4657579142 100644
--- a/__tests__/html/offlineUI.sendFailed.noAck.html
+++ b/__tests__/html/offlineUI.sendFailed.noAck.html
@@ -16,7 +16,7 @@
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="https://unpkg.com/lolex@4/lolex.js"></script>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, shareObservable, timeouts, token } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/offlineUI.sendFailed.notSend.html b/__tests__/html/offlineUI.sendFailed.notSend.html
index c9ba037d77..c619d76ec9 100644
--- a/__tests__/html/offlineUI.sendFailed.notSend.html
+++ b/__tests__/html/offlineUI.sendFailed.notSend.html
@@ -16,7 +16,7 @@
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="https://unpkg.com/lolex@4/lolex.js"></script>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, timeouts, token } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/offlineUI.slowNetwork.firstConnect.html b/__tests__/html/offlineUI.slowNetwork.firstConnect.html
index eb2197d41d..8f9c44e838 100644
--- a/__tests__/html/offlineUI.slowNetwork.firstConnect.html
+++ b/__tests__/html/offlineUI.slowNetwork.firstConnect.html
@@ -16,7 +16,7 @@
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="https://unpkg.com/lolex@4/lolex.js"></script>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, updateIn, timeouts, token } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/offlineUI.slowNetwork.reconnect.html b/__tests__/html/offlineUI.slowNetwork.reconnect.html
index 0d4a3426e5..6b038814f3 100644
--- a/__tests__/html/offlineUI.slowNetwork.reconnect.html
+++ b/__tests__/html/offlineUI.slowNetwork.reconnect.html
@@ -16,7 +16,7 @@
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="https://unpkg.com/lolex@4/lolex.js"></script>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       const { conditions, createStore, host, pageObjects, shareObservable, timeouts, token } = window.WebChatTest;
 
       (async function() {
diff --git a/__tests__/html/speechRecognition.simple.html b/__tests__/html/speechRecognition.simple.html
index c1b3de80c2..0f6c3dc435 100644
--- a/__tests__/html/speechRecognition.simple.html
+++ b/__tests__/html/speechRecognition.simple.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html lang="en-US">
   <head>
+    <script crossorigin="anonymous" src="https://unpkg.com/core-js@2/client/core.min.js"></script>
     <script crossorigin="anonymous" src="https://unpkg.com/@babel/standalone@7/babel.min.js"></script>
     <script crossorigin="anonymous" src="https://unpkg.com/regenerator-runtime/runtime.js"></script>
     <script crossorigin="anonymous" src="https://unpkg.com/react@16.8.6/umd/react.development.js"></script>
@@ -18,7 +19,7 @@
     <script
       type="text/babel"
       data-plugins="@babel/plugin-proposal-async-generator-functions"
-      data-presets="es2015,stage-3"
+      data-presets="env,stage-3"
     >
       const {
         conditions,
diff --git a/__tests__/html/toast.html b/__tests__/html/toast.html
index 99f11ed9a6..a9e1cf0ff8 100644
--- a/__tests__/html/toast.html
+++ b/__tests__/html/toast.html
@@ -15,7 +15,7 @@
   <body>
     <div id="webchat"></div>
     <script crossorigin="anonymous" src="/__dist__/webchat-es5.js"></script>
-    <script type="text/babel" data-presets="es2015,stage-3">
+    <script type="text/babel" data-presets="env,stage-3">
       (async function() {
         const { conditions, createStore, host, pageObjects, timeouts, token } = window.WebChatTest;
 
diff --git a/packages/component/package-lock.json b/packages/component/package-lock.json
index 3f0abdec21..8168e15b28 100644
--- a/packages/component/package-lock.json
+++ b/packages/component/package-lock.json
@@ -8077,24 +8077,14 @@
 			}
 		},
 		"react-say": {
-			"version": "2.0.0",
-			"resolved": "https://registry.npmjs.org/react-say/-/react-say-2.0.0.tgz",
-			"integrity": "sha512-jHtvt5Q+v5W1iqnQROEF3DL20zZYqz319ZkcVgQyyLyx/1GZ4Nr3gXaGvf0JHBpp+/UcETdtFTgOEzpDCaOL6Q==",
+			"version": "2.0.1-master.c5d6304",
+			"resolved": "https://registry.npmjs.org/react-say/-/react-say-2.0.1-master.c5d6304.tgz",
+			"integrity": "sha512-AbSVouNLXOjh/pKM6OWYR+/DjBp/5uuOmXfz50FmP/T7Kd2E7hC0GY/ZKWuwn85bgDNGsTb8X2XJYuFEI8MhyA==",
 			"requires": {
 				"@babel/runtime": "^7.7.2",
 				"classnames": "^2.2.6",
 				"event-as-promise": "^1.0.5",
 				"memoize-one": "^5.1.1"
-			},
-			"dependencies": {
-				"@babel/runtime": {
-					"version": "7.7.2",
-					"resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.7.2.tgz",
-					"integrity": "sha512-JONRbXbTXc9WQE2mAZd1p0Z3DZ/6vaQIkgYMSTP3KjRCyd7rCZCcfhCyX+YjwcKxcZ82UrxbRD358bpExNgrjw==",
-					"requires": {
-						"regenerator-runtime": "^0.13.2"
-					}
-				}
 			}
 		},
 		"react-scroll-to-bottom": {
@@ -8212,11 +8202,6 @@
 				"regenerate": "^1.4.0"
 			}
 		},
-		"regenerator-runtime": {
-			"version": "0.13.3",
-			"resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.3.tgz",
-			"integrity": "sha512-naKIZz2GQ8JWh///G7L3X6LaQUAMp2lvb1rvwwsURe/VXwD6VMfr+/1NuNw3ag8v2kY1aQ/go5SNn79O9JU7yw=="
-		},
 		"regenerator-transform": {
 			"version": "0.14.2",
 			"resolved": "https://registry.npmjs.org/regenerator-transform/-/regenerator-transform-0.14.2.tgz",
diff --git a/packages/component/package.json b/packages/component/package.json
index 64d48b7dfa..37cc943ab9 100644
--- a/packages/component/package.json
+++ b/packages/component/package.json
@@ -66,7 +66,7 @@
     "react-dictate-button": "1.2.2",
     "react-film": "2.0.2",
     "react-redux": "7.2.0",
-    "react-say": "2.0.0",
+    "react-say": "2.0.1-master.c5d6304",
     "react-scroll-to-bottom": "1.3.2",
     "redux": "4.0.5",
     "remark": "10.0.1",
diff --git a/packages/testharness/package-lock.json b/packages/testharness/package-lock.json
index a9234fceba..c9463f31a4 100644
--- a/packages/testharness/package-lock.json
+++ b/packages/testharness/package-lock.json
@@ -1412,6 +1412,26 @@
 			"resolved": "https://registry.npmjs.org/@xtuc/long/-/long-4.2.2.tgz",
 			"integrity": "sha512-NuHqBY1PB/D8xU6s/thBgOAiAP7HOYDQ32+BFZILJ8ivkUkAHQnWfn6WhL79Owj1qmUnoN/YPhktdIoucipkAQ=="
 		},
+		"abort-controller": {
+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
+			"integrity": "sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==",
+			"requires": {
+				"event-target-shim": "^5.0.0"
+			}
+		},
+		"abort-controller-es5": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/abort-controller-es5/-/abort-controller-es5-1.0.1.tgz",
+			"integrity": "sha512-SPZjtufmQF3OVgSoisWz/p0nh6y7+GX0IShlhP5D5fgRQOSOg0RrD+oQZyr1wVR1zbQRIMyCWBMeiZ+x1wlD6A==",
+			"requires": {
+				"@babel/core": "^7",
+				"@babel/preset-env": "^7",
+				"babel-loader": "^8",
+				"webpack": "^4",
+				"webpack-cli": "^3"
+			}
+		},
 		"acorn": {
 			"version": "6.4.0",
 			"resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.0.tgz",
@@ -2558,6 +2578,18 @@
 			"resolved": "https://registry.npmjs.org/event-target-shim/-/event-target-shim-5.0.1.tgz",
 			"integrity": "sha512-i/2XbnSz/uxRCU6+NdVJgKWDTM427+MqYbkQzD321DuCQJUqOuJKIA0IM2+W2xtYHdKOmZ4dR6fExsd4SXL+WQ=="
 		},
+		"event-target-shim-es5": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/event-target-shim-es5/-/event-target-shim-es5-1.0.1.tgz",
+			"integrity": "sha512-B0Mf39KbCOFeteDA2oBsw9XU4E1d4kCUQI0KLPEjSdAMP3idctAXqxu+qjJC2lwGLtcjOAUfwxzlARDT8bsEDA==",
+			"requires": {
+				"@babel/core": "^7",
+				"@babel/preset-env": "^7",
+				"babel-loader": "^8",
+				"webpack": "^4",
+				"webpack-cli": "^3"
+			}
+		},
 		"events": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/events/-/events-3.1.0.tgz",
diff --git a/packages/testharness/package.json b/packages/testharness/package.json
index 9708d0bd40..ba4e5f3210 100644
--- a/packages/testharness/package.json
+++ b/packages/testharness/package.json
@@ -7,6 +7,7 @@
     "build": "npm run build:babel && npm run build:webpack",
     "build:babel": "babel src --out-dir lib --verbose",
     "build:webpack": "webpack-cli",
+    "postinstall": "webpack-cli --config pre/webpack.config.js",
     "prestart": "npm run build:babel",
     "start": "concurrently --kill-others --names \"babel,webpack\" \"npm run start:babel\" \"npm run start:webpack\"",
     "start:babel": "npm run build:babel -- --skip-initial-build --watch",
@@ -21,6 +22,7 @@
     "@babel/plugin-transform-runtime": "^7.8.3",
     "@babel/preset-env": "^7.8.7",
     "@babel/runtime": "^7.8.7",
+    "babel-loader": "^8.1.0",
     "concurrently": "^5.1.0",
     "core-js": "^3.6.4",
     "source-map-loader": "^0.2.4",
@@ -29,9 +31,12 @@
   },
   "dependencies": {
     "@babel/plugin-proposal-async-generator-functions": "^7.8.3",
+    "abort-controller": "^3.0.0",
+    "abort-controller-es5": "^1.0.1",
     "base64-arraybuffer": "^0.2.0",
     "event-iterator": "^1.2.0",
     "event-target-shim": "^5.0.1",
+    "event-target-shim-es5": "^1.0.1",
     "expect": "^25.1.0",
     "math-random": "^1.0.4",
     "microsoft-cognitiveservices-speech-sdk": "1.10.1",
diff --git a/packages/testharness/pre/external/@babel/plugin-proposal-async-generator-functions/index.js b/packages/testharness/pre/external/@babel/plugin-proposal-async-generator-functions/index.js
new file mode 100644
index 0000000000..34f958c468
--- /dev/null
+++ b/packages/testharness/pre/external/@babel/plugin-proposal-async-generator-functions/index.js
@@ -0,0 +1,3 @@
+import BabelPluginProposalAsyncGeneratorFunctions from '@babel/plugin-proposal-async-generator-functions';
+
+export default BabelPluginProposalAsyncGeneratorFunctions;
diff --git a/packages/testharness/pre/external/event-iterator/index.js b/packages/testharness/pre/external/event-iterator/index.js
new file mode 100644
index 0000000000..f3e2076711
--- /dev/null
+++ b/packages/testharness/pre/external/event-iterator/index.js
@@ -0,0 +1,3 @@
+import { EventIterator } from 'event-iterator';
+
+export { EventIterator }
diff --git a/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents.js b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents.js
new file mode 100644
index 0000000000..beaaabac6d
--- /dev/null
+++ b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents.js
@@ -0,0 +1,19 @@
+import {
+  AudioSourceErrorEvent,
+  AudioSourceInitializingEvent,
+  AudioSourceOffEvent,
+  AudioSourceReadyEvent,
+  AudioStreamNodeAttachedEvent,
+  AudioStreamNodeAttachingEvent,
+  AudioStreamNodeDetachedEvent
+} from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents';
+
+export {
+  AudioSourceErrorEvent,
+  AudioSourceInitializingEvent,
+  AudioSourceOffEvent,
+  AudioSourceReadyEvent,
+  AudioStreamNodeAttachedEvent,
+  AudioStreamNodeAttachingEvent,
+  AudioStreamNodeDetachedEvent
+};
diff --git a/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource.js b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource.js
new file mode 100644
index 0000000000..90cc78efa6
--- /dev/null
+++ b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource.js
@@ -0,0 +1,3 @@
+import { EventSource } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource';
+
+export { EventSource };
diff --git a/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events.js b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events.js
new file mode 100644
index 0000000000..6758c189d1
--- /dev/null
+++ b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events.js
@@ -0,0 +1,3 @@
+import { Events } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events';
+
+export { Events };
diff --git a/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid.js b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid.js
new file mode 100644
index 0000000000..6fcd89297f
--- /dev/null
+++ b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid.js
@@ -0,0 +1,3 @@
+import { createNoDashGuid } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid';
+
+export { createNoDashGuid };
diff --git a/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise.js b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise.js
new file mode 100644
index 0000000000..bdfb918bdd
--- /dev/null
+++ b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise.js
@@ -0,0 +1,3 @@
+import { PromiseHelper } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise';
+
+export { PromiseHelper };
diff --git a/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream.js b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream.js
new file mode 100644
index 0000000000..a805d9873c
--- /dev/null
+++ b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream.js
@@ -0,0 +1,3 @@
+import { Stream } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream';
+
+export { Stream };
diff --git a/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/index.js b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/index.js
new file mode 100644
index 0000000000..7c25e134c1
--- /dev/null
+++ b/packages/testharness/pre/external/microsoft-cognitiveservices-speech-sdk/index.js
@@ -0,0 +1,3 @@
+import { AudioStreamFormat } from 'microsoft-cognitiveservices-speech-sdk';
+
+export { AudioStreamFormat };
diff --git a/packages/testharness/pre/webpack.config.js b/packages/testharness/pre/webpack.config.js
new file mode 100644
index 0000000000..1a34d66f66
--- /dev/null
+++ b/packages/testharness/pre/webpack.config.js
@@ -0,0 +1,70 @@
+const { join } = require('path');
+
+module.exports = {
+  devtool: 'source-map',
+  entry: {
+    'external/@babel/plugin-proposal-async-generator-functions/index': join(
+      __dirname,
+      './external/@babel/plugin-proposal-async-generator-functions/index.js'
+    ),
+    'external/event-iterator/index': join(__dirname, './external/event-iterator/index.js'),
+    'external/microsoft-cognitiveservices-speech-sdk/index': join(
+      __dirname,
+      './external/microsoft-cognitiveservices-speech-sdk/index.js'
+    ),
+    'external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents': join(
+      __dirname,
+      './external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents.js'
+    ),
+    'external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events': join(
+      __dirname,
+      './external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events.js'
+    ),
+    'external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource': join(
+      __dirname,
+      './external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource.js'
+    ),
+    'external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid': join(
+      __dirname,
+      './external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid.js'
+    ),
+    'external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise': join(
+      __dirname,
+      './external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise.js'
+    ),
+    'external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream': join(
+      __dirname,
+      './external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream.js'
+    )
+  },
+  mode: 'development',
+  module: {
+    rules: [
+      {
+        exclude: [],
+        test: /\.js$/,
+        use: {
+          loader: 'babel-loader',
+          options: {
+            presets: [
+              [
+                '@babel/preset-env',
+                {
+                  forceAllTransforms: true,
+                  modules: 'commonjs'
+                }
+              ]
+            ]
+          }
+        }
+      }
+    ]
+  },
+  // @babel/plugin-proposal-async-generator-functions is causing a false error because @babel/core import "fs" without the need to use it.
+  // We are emptying out "fs" to ignore the error.
+  node: { fs: 'empty' },
+  output: {
+    libraryTarget: 'commonjs2',
+    path: join(__dirname, '../lib')
+  }
+};
diff --git a/packages/testharness/src/index.js b/packages/testharness/src/index.js
index 1448d38ad3..6606a8fefe 100644
--- a/packages/testharness/src/index.js
+++ b/packages/testharness/src/index.js
@@ -1,9 +1,10 @@
-import { EventIterator } from 'event-iterator';
-import babelPluginProposalAsyncGeneratorFunctions from '@babel/plugin-proposal-async-generator-functions';
 import createDeferred from 'p-defer-es5';
 import expect from 'expect';
 import updateIn from 'simple-update-in';
 
+import { EventIterator } from './external/event-iterator';
+import BabelPluginProposalAsyncGeneratorFunctions from './external/@babel/plugin-proposal-async-generator-functions';
+
 import { timeouts } from './constants';
 import * as conditions from './conditions/index';
 import * as elements from './elements/index';
@@ -23,7 +24,10 @@ import shareObservable from './utils/shareObservable';
 import sleep from './utils/sleep';
 import subscribeConsole, { getHistory as getConsoleHistory } from './utils/subscribeConsole';
 
-window.Babel.registerPlugin('@babel/plugin-proposal-async-generator-functions', babelPluginProposalAsyncGeneratorFunctions);
+window.Babel.registerPlugin(
+  '@babel/plugin-proposal-async-generator-functions',
+  BabelPluginProposalAsyncGeneratorFunctions
+);
 
 const log = console.log.bind(console);
 
diff --git a/packages/testharness/src/jobs.js b/packages/testharness/src/jobs.js
index cbb3ab928b..96ff6bce19 100644
--- a/packages/testharness/src/jobs.js
+++ b/packages/testharness/src/jobs.js
@@ -1,4 +1,4 @@
-import createDeferred from 'p-defer';
+import createDeferred from 'p-defer-es5';
 
 import uniqueId from './utils/uniqueId';
 
diff --git a/packages/testharness/src/pageObjects/wait.js b/packages/testharness/src/pageObjects/wait.js
index afb4e93d8e..f3e6391f2e 100644
--- a/packages/testharness/src/pageObjects/wait.js
+++ b/packages/testharness/src/pageObjects/wait.js
@@ -1,3 +1,5 @@
+import AbortController from 'abort-controller-es5';
+
 import sleep from '../utils/sleep';
 
 export default async function wait(condition, timeout = 2000) {
diff --git a/packages/testharness/src/speech/speechRecognition/createQueuedArrayBufferAudioSource.js b/packages/testharness/src/speech/speechRecognition/createQueuedArrayBufferAudioSource.js
index 3b2ee61c78..9fdb7815eb 100644
--- a/packages/testharness/src/speech/speechRecognition/createQueuedArrayBufferAudioSource.js
+++ b/packages/testharness/src/speech/speechRecognition/createQueuedArrayBufferAudioSource.js
@@ -1,4 +1,4 @@
-import { AudioStreamFormat } from 'microsoft-cognitiveservices-speech-sdk';
+import { AudioStreamFormat } from '../../external/microsoft-cognitiveservices-speech-sdk';
 
 import {
   AudioSourceErrorEvent,
@@ -9,13 +9,13 @@ import {
   AudioStreamNodeAttachingEvent,
   AudioStreamNodeDetachedEvent
   // AudioStreamNodeErrorEvent,
-} from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents';
+} from '../../external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/AudioSourceEvents';
 
-import { createNoDashGuid } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid';
-import { Events } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events';
-import { EventSource } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource';
-import { PromiseHelper } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise';
-import { Stream } from 'microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream';
+import { createNoDashGuid } from '../../external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Guid';
+import { Events } from '../../external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Events';
+import { EventSource } from '../../external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/EventSource';
+import { PromiseHelper } from '../../external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Promise';
+import { Stream } from '../../external/microsoft-cognitiveservices-speech-sdk/distrib/lib/src/common/Stream';
 
 const CHUNK_SIZE = 4096;
 
diff --git a/packages/testharness/src/speech/speechRecognition/fetchAuthorizationToken.js b/packages/testharness/src/speech/speechRecognition/fetchAuthorizationToken.js
index 74aaad8d0f..b9e58ce976 100644
--- a/packages/testharness/src/speech/speechRecognition/fetchAuthorizationToken.js
+++ b/packages/testharness/src/speech/speechRecognition/fetchAuthorizationToken.js
@@ -1,5 +1,3 @@
-import fetch from 'node-fetch';
-
 export default async function fetchAuthorizationToken({ region, subscriptionKey, tokenURL }) {
   if (!region && !tokenURL) {
     throw new Error('Either "region" or "tokenURL" must be specified.');
diff --git a/packages/testharness/src/speech/speechSynthesis/MockAudioContext.js b/packages/testharness/src/speech/speechSynthesis/MockAudioContext.js
index c510afb533..ac25329059 100644
--- a/packages/testharness/src/speech/speechSynthesis/MockAudioContext.js
+++ b/packages/testharness/src/speech/speechSynthesis/MockAudioContext.js
@@ -1,4 +1,20 @@
-import EventTarget, { defineEventAttribute } from 'event-target-shim';
+import EventTarget, { defineEventAttribute } from 'event-target-shim-es5';
+
+function createCustomEvent(name) {
+  if (name === 'error') {
+    if (typeof ErrorEvent === 'function') {
+      return new ErrorEvent(name);
+    }
+  } else if (typeof CustomEvent === 'function') {
+    return new CustomEvent(name);
+  }
+
+  const event = document.createEvent('Event');
+
+  event.initEvent(name, true, true);
+
+  return event;
+}
 
 class MockAudioBuffer {
   constructor(channels, frames, samplesPerSec) {
@@ -37,7 +53,7 @@ class MockAudioBufferSource extends EventTarget {
       });
     }
 
-    this.dispatchEvent(new Event('ended'));
+    this.dispatchEvent(createCustomEvent('ended'));
   }
 
   stop(when) {
@@ -71,7 +87,7 @@ export default class MockAudioContext extends EventTarget {
 
   close() {
     this.state = 'closed';
-    this.dispatchEvent(new Event('statechange'));
+    this.dispatchEvent(createCustomEvent('statechange'));
   }
 
   createBufferSource() {
@@ -85,14 +101,14 @@ export default class MockAudioContext extends EventTarget {
   resume() {
     if (this.state === 'suspended') {
       this.state = 'running';
-      this.dispatchEvent(new Event('statechange'));
+      this.dispatchEvent(createCustomEvent('statechange'));
     }
   }
 
   suspend() {
     if (this.state === 'running') {
       this.state = 'suspended';
-      this.dispatchEvent(new Event('statechange'));
+      this.dispatchEvent(createCustomEvent('statechange'));
     }
   }
 
diff --git a/packages/testharness/src/speech/speechSynthesis/recognizeRiffWaveArrayBuffer.js b/packages/testharness/src/speech/speechSynthesis/recognizeRiffWaveArrayBuffer.js
index 0cbf0412be..8a7bbfdc24 100644
--- a/packages/testharness/src/speech/speechSynthesis/recognizeRiffWaveArrayBuffer.js
+++ b/packages/testharness/src/speech/speechSynthesis/recognizeRiffWaveArrayBuffer.js
@@ -1,4 +1,4 @@
-import { AudioStreamFormat } from 'microsoft-cognitiveservices-speech-sdk';
+import { AudioStreamFormat } from '../../external/microsoft-cognitiveservices-speech-sdk';
 
 export default async function recognizeRiffWaveArrayBuffer({
   arrayBuffer,
diff --git a/packages/testharness/src/utils/runAsyncInterval.js b/packages/testharness/src/utils/runAsyncInterval.js
index ac1352b3aa..9f98653518 100644
--- a/packages/testharness/src/utils/runAsyncInterval.js
+++ b/packages/testharness/src/utils/runAsyncInterval.js
@@ -1,7 +1,7 @@
 // setTimeout may get overwritten when lolex is installed.
 // globalSetTimeout is to save the original setTimeout before it get overwritten.
 
-const globalSetTimeout = setTimeout;
+const globalSetTimeout = window.setTimeout.bind(window);
 
 export default function runAsyncInterval(fn, intervalInMS) {
   let timeout;
diff --git a/packages/testharness/src/utils/sleep.js b/packages/testharness/src/utils/sleep.js
index 1bc47c866c..ed0727268e 100644
--- a/packages/testharness/src/utils/sleep.js
+++ b/packages/testharness/src/utils/sleep.js
@@ -1,6 +1,6 @@
 // setTimeout can be polluted by Lolex, we save the version before it happen.
-const globalClearTimeout = clearTimeout;
-const globalSetTimeout = setTimeout;
+const globalClearTimeout = window.clearTimeout.bind(window);
+const globalSetTimeout = window.setTimeout.bind(window);
 
 export default function sleep(durationInMS, abortSignal) {
   return new Promise(resolve => {
diff --git a/packages/testharness/webpack.config.js b/packages/testharness/webpack.config.js
index 8eccd7d2e1..701cf05fb7 100644
--- a/packages/testharness/webpack.config.js
+++ b/packages/testharness/webpack.config.js
@@ -3,9 +3,6 @@ const { join } = require('path');
 let config = {
   entry: './lib/index',
   mode: 'production',
-  // @babel/plugin-proposal-async-generator-functions is causing a false error because @babel/core import "fs" without the need to use it.
-  // We are emptying out "fs" to ignore the error.
-  node: { fs: 'empty' },
   output: {
     filename: 'testharness.js',
     library: 'WebChatTest',
@@ -27,6 +24,7 @@ if (node_env !== 'production' && node_env !== 'test') {
         ...((config.module || {}).rules || []),
         {
           enforce: 'pre',
+          exclude: [/external\//],
           include: [join(__dirname, './lib')],
           test: /\.js$/,
           use: ['source-map-loader']
