Port fix in https://github.com/DefinitelyTyped/DefinitelyTyped/pull/11811 (#11913)

chrome/chrome-app-tests.ts

@@ -71,10 +71,10 @@ function test_fileSystem(): void {
 // Sockets
 // https://developer.chrome.com/apps/sockets_tcp
 function test_socketsTcp(): void {
-    var socketId: number;
+    var socketId: number = 0;
     var properties: chrome.sockets.tcp.SocketProperties = {};
     var buffer: ArrayBuffer = new ArrayBuffer(256);
-    
+
     // create
     chrome.sockets.tcp.create((info) => {
         socketId = info.socketId;
@@ -158,7 +158,7 @@ function testSocketsTcpTypes(): void {
 
 // https://developer.chrome.com/apps/sockets_udp
 function test_socketsUdp(): void {
-    var socketId: number;
+    var socketId: number = 0
     var properties: chrome.sockets.udp.SocketProperties = {};
     var buffer: ArrayBuffer = new ArrayBuffer(256);
 
@@ -246,7 +246,7 @@ function testSocketsUdpTypes(): void {
 
 // https://developer.chrome.com/apps/sockets_tcpServer
 function test_socketsTcpServer(): void {
-    var socketId: number;
+    var socketId: number = 0;
     var properties: chrome.sockets.tcpServer.SocketProperties = {};
     var buffer: ArrayBuffer = new ArrayBuffer(256);
 

chrome/chrome-app.d.ts

@@ -3,7 +3,7 @@
 // Definitions by: Adam Lay <https://github.com/AdamLay>, MIZUNE Pine <https://github.com/pine613>, MIZUSHIMA Junki <https://github.com/mzsm>, Ingvar Stepanyan <https://github.com/RReverser>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-/// <reference path="chrome.d.ts"/>
+/// <reference path="index.d.ts"/>
 /// <reference types="filesystem"/>
 
 ////////////////////

chrome/tsconfig.json

@@ -14,6 +14,9 @@
     },
     "files": [
         "index.d.ts",
+        "chrome-app.d.ts",
+        "chrome-app-tests.ts",
+        "chrome-cast.d.ts",
         "chrome-tests.ts"
     ]
 }