Convert shim to Typescript (#32)

ext/src/shim/index.ts

@@ -0,0 +1,33 @@
+"use strict";
+
+import cast from "./cast";
+import media from "./media";
+
+import { onMessage } from "./messageBridge";
+
+
+const global = (window as any);
+
+if (!global.chrome) {
+    global.chrome = {};
+}
+
+global.chrome.cast = cast;
+global.chrome.cast.media = media;
+
+
+onMessage(message => {
+    switch (message.subject) {
+        case "shim:/initialized": {
+            const bridgeInfo = message.data;
+
+            // Call page's API loaded function if defined
+            const readyFunction = global.__onGCastApiAvailable;
+            if (readyFunction && typeof readyFunction === "function") {
+                readyFunction(bridgeInfo && bridgeInfo.isVersionCompatible);
+            }
+
+            break;
+        }
+    }
+});