diff --git a/src/DeviceDescriptors.js b/src/DeviceDescriptors.ts
similarity index 98%
rename from src/DeviceDescriptors.js
rename to src/DeviceDescriptors.ts
index 5d586d779a455..945e5cadf7f47 100644
--- a/src/DeviceDescriptors.js
+++ b/src/DeviceDescriptors.ts
@@ -14,7 +14,20 @@
  * limitations under the License.
  */
 
-module.exports = [
+interface Device {
+  name: string;
+  userAgent: string;
+  viewport: {
+    width: number;
+    height: number;
+    deviceScaleFactor: number;
+    isMobile: boolean;
+    hasTouch: boolean;
+    isLandscape: boolean;
+  };
+};
+
+const devices: Device[] = [
   {
     'name': 'Blackberry PlayBook',
     'userAgent': 'Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.1.0; en-US) AppleWebKit/536.2+ (KHTML like Gecko) Version/7.2.1.0 Safari/536.2+',
@@ -868,5 +881,15 @@ module.exports = [
     }
   }
 ];
-for (const device of module.exports)
-  module.exports[device.name] = device;
+
+type DevicesMap = {
+  [name: string]: Device;
+};
+
+const devicesMap: DevicesMap = {};
+
+for (const device of devices) {
+  devicesMap[device.name] = device;
+}
+
+export = devicesMap;
diff --git a/tsconfig.json b/tsconfig.json
index 815fab9b1be10..baf9d96a5a493 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,7 +4,8 @@
     "checkJs": true,
     "outDir": "./lib",
     "target": "ESNext",
-    "moduleResolution": "node"
+    "moduleResolution": "node",
+    "module": "CommonJS"
   },
   "include": [
     "src"