Added TypeScript typings to Audio class

src/Audio/Audio.ts

@@ -3,25 +3,25 @@ import Data from '../Data/Data';
 
 export default class Audio {
     private context: AudioContext;
-    private _cache = {};
+    private _cache: any = {};
 
     constructor() {
         this.context = new AudioContext();
     }
 
-    enable() {
+    enable(): void {
         if(this.context.state === 'suspended') {
             this.context.resume();
         }
     }
 
-    playSound(src) {
+    playSound(src: string): AudioBufferSourceNode {
         // try to resume context if suspended
         if(this.context.state == 'suspended') {
             this.enable();
         }
 
-
+        // EXCEPTION: sounds must be fully loaded before they can be played
         if(src in this._cache == false || this._cache[src] == null) {
             const msg = `Tried to play sound that hasn't been loaded: ${src}`;
             FrostFlake.Log.error(msg);
@@ -31,7 +31,7 @@ export default class Audio {
         // EARLY OUT: can't play audio because the context isn't running
         if(this.context.state !== 'running') {
             FrostFlake.Log.warn('Cannot play sounds: audio context is not running');
-            return;
+            return null;
         }
 
         let sound = this.context.createBufferSource();
@@ -41,7 +41,7 @@ export default class Audio {
         return sound;
     }
 
-    async loadSound(src) {
+    async loadSound(src: string): Promise<AudioBuffer> {
         // EARLY OUT: sound already loaded
         if(src in this._cache) {
             return this._cache[src];
@@ -60,7 +60,7 @@ export default class Audio {
             throw Error(msg);
         }
 
-        const promise = new Promise((resolve, reject) => {
+        const promise = new Promise<AudioBuffer>((resolve, reject) => {
             this.context.decodeAudioData(buffer, (decoded) => {
                 this._cache[src] = decoded;
                 resolve(decoded);