Update typings and fix issues

Author: javiercn

src/Components/Web.JS/src/Boot.WebAssembly.Common.ts

@@ -103,10 +103,10 @@ async function startCore(components: RootComponentManager<WebAssemblyComponentDe
   };
 
   Blazor._internal.applyHotReloadDeltas = (deltas: { moduleId: string, metadataDelta: string, ilDelta: string, pdbDelta: string, updatedTypes: number[] }[], loggingLevel: number) => {
-    return dispatcher.invokeDotNetStaticMethod('Microsoft.AspNetCore.Components.WebAssembly', 'ApplyHotReloadDeltas', deltas, loggingLevel);
+    return dispatcher.invokeDotNetStaticMethod('Microsoft.AspNetCore.Components.WebAssembly', 'ApplyHotReloadDeltas', deltas, loggingLevel) ?? [];
   };
 
-  Blazor._internal.getApplyUpdateCapabilities = () => dispatcher.invokeDotNetStaticMethod('Microsoft.AspNetCore.Components.WebAssembly', 'GetApplyUpdateCapabilities');
+  Blazor._internal.getApplyUpdateCapabilities = () => dispatcher.invokeDotNetStaticMethod('Microsoft.AspNetCore.Components.WebAssembly', 'GetApplyUpdateCapabilities') ?? '';
 
   // Configure JS interop
   Blazor._internal.invokeJSJson = invokeJSJson;

src/JSInterop/Microsoft.JSInterop.JS/src/src/Microsoft.JSInterop.ts

@@ -118,7 +118,7 @@ export module DotNet {
    * @param args Arguments to pass to the method, each of which must be JSON-serializable.
    * @returns The result of the operation.
    */
-  export function invokeMethod<T>(assemblyName: string, methodIdentifier: string, ...args: any[]): T {
+  export function invokeMethod<T>(assemblyName: string, methodIdentifier: string, ...args: any[]): T | null {
       const dispatcher = getDefaultCallDispatcher();
       return dispatcher.invokeDotNetStaticMethod<T>(assemblyName, methodIdentifier, ...args);
   }
@@ -342,7 +342,7 @@ export module DotNet {
      * @param args Arguments to pass to the method, each of which must be JSON-serializable.
      * @returns The result of the operation.
      */
-    invokeDotNetStaticMethod<T>(assemblyName: string, methodIdentifier: string, ...args: any[]): T;
+    invokeDotNetStaticMethod<T>(assemblyName: string, methodIdentifier: string, ...args: any[]): | null;
 
     /**
      * Invokes the specified .NET public static method asynchronously.
@@ -436,7 +436,7 @@ export module DotNet {
           this.completePendingCall(parseInt(asyncCallId, 10), success, resultOrError);
       }
 
-      invokeDotNetStaticMethod<T>(assemblyName: string, methodIdentifier: string, ...args: any[]): T {
+      invokeDotNetStaticMethod<T>(assemblyName: string, methodIdentifier: string, ...args: any[]): T | null {
           return this.invokeDotNetMethod<T>(assemblyName, methodIdentifier, null, args);
       }
 
@@ -564,7 +564,7 @@ export module DotNet {
       constructor(private readonly _id: number, private readonly _callDispatcher: CallDispatcher) {
       }
 
-      public invokeMethod<T>(methodIdentifier: string, ...args: any[]): T {
+      public invokeMethod<T>(methodIdentifier: string, ...args: any[]): T | null {
           return this._callDispatcher.invokeDotNetMethod<T>(null, methodIdentifier, this._id, args);
       }