fix typescript types

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/@types/global.d.ts

@@ -14,8 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {ReactNode} from "react";
 import "modernizr";
+import {Renderer} from "react-dom";
 
 declare global {
     interface Window {
@@ -25,7 +25,10 @@ declare global {
         };
 
         mxSendRageshake: (text: string, withLogs?: boolean) => void;
-        matrixChat: ReactNode;
+        matrixChat: ReturnType<Renderer>;
+
+        // electron-only
+        ipcRenderer: any;
     }
 
     // workaround for https://github.com/microsoft/TypeScript/issues/30933

src/vector/init.tsx

@@ -36,7 +36,7 @@ import { initRageshake } from "./rageshakesetup";
 export const rageshakePromise = initRageshake();
 
 export function preparePlatform() {
-    if ((<any>window).ipcRenderer) {
+    if (window.ipcRenderer) {
         console.log("Using Electron platform");
         const plaf = new ElectronPlatform();
         PlatformPeg.set(plaf);