fix(Http, Node): return type of decode method (#28)

Author: AwesomeStickz

Diff for: src/base/Node.ts

@@ -1,7 +1,7 @@
 import WebSocket = require('ws');
 import { EventEmitter } from 'events';
 import Connection, { Options as ConnectionOptions } from '../core/Connection';
-import Http, { Track, TrackResponse } from '../core/Http';
+import Http, { Track, TrackInfo, TrackResponse } from '../core/Http';
 import PlayerStore from '../core/PlayerStore';
 
 export interface VoiceStateUpdate {
@@ -74,9 +74,9 @@ export default abstract class BaseNode extends EventEmitter {
     throw new Error('no available http module');
   }
 
-  public decode(track: string): Promise<Track>;
+  public decode(track: string): Promise<TrackInfo>;
   public decode(tracks: string[]): Promise<Track[]>;
-  public decode(tracks: string | string[]): Promise<Track | Track[]> {
+  public decode(tracks: string | string[]): Promise<TrackInfo | Track[]> {
     if (this.http) return this.http.decode(tracks);
     throw new Error('no available http module');
   }

Diff for: src/core/Http.ts

@@ -39,18 +39,20 @@ export interface PlaylistInfo {
   selectedTrack?: number
 }
 
+export interface TrackInfo {
+  identifier: string;
+  isSeekable: boolean;
+  author: string;
+  length: number;
+  isStream: boolean;
+  position: number;
+  title: string;
+  uri: string;
+}
+
 export interface Track {
   track: string;
-  info: {
-    identifier: string;
-    isSeekable: boolean;
-    author: string;
-    length: number;
-    isStream: boolean;
-    position: number;
-    title: string;
-    uri: string;
-  };
+  info: TrackInfo;
 }
 
 export default class Http {
@@ -77,10 +79,10 @@ export default class Http {
     return this.do('GET', url);
   }
 
-  public decode(track: string): Promise<Track>;
+  public decode(track: string): Promise<TrackInfo>;
   public decode(tracks: string[]): Promise<Track[]>;
-  public decode(tracks: string | string[]): Promise<Track | Track[]>;
-  public decode(tracks: string | string[]): Promise<Track | Track[]> {
+  public decode(tracks: string | string[]): Promise<TrackInfo | Track[]>;
+  public decode(tracks: string | string[]): Promise<TrackInfo | Track[]> {
     const url = this.url();
     if (Array.isArray(tracks)) {
       url.pathname = '/decodetracks';