Upgrade typescript to 3.0.1

package-lock.json

@@ -5,9 +5,9 @@
   "requires": true,
   "dependencies": {
     "typescript": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.2.tgz",
-      "integrity": "sha1-PFtv1/beCRQmkCfwPAlGdY92c6Q=",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.0.1.tgz",
+      "integrity": "sha512-zQIMOmC+372pC/CCVLqnQ0zSBiY7HHodU7mpQdjiZddek4GMj31I3dUJ7gAs9o65X7mnRma6OokOkc6f9jjfBg==",
       "dev": true
     }
   }

package.json

@@ -9,7 +9,7 @@
   "author": "Thomas Dy <thatsmydoing@gmail.com",
   "license": "ISC",
   "devDependencies": {
-    "typescript": "^2.6.2"
+    "typescript": "^3.0.1"
   },
   "dependencies": {}
 }

src/audio.ts

@@ -25,7 +25,7 @@ namespace audio {
     loadTrackFromFile(file: File): Promise<Track> {
       let promise = new Promise<ArrayBuffer>((resolve, reject) => {
         let reader = new FileReader();
-        reader.onloadend = () => resolve(reader.result);
+        reader.onload = () => resolve(reader.result as ArrayBuffer);
         reader.readAsArrayBuffer(file);
       });
       return promise