var timeZoneOffSet = await jsRuntime.InvokeAsync<int>("eval", "new Date().getTimezoneOffset()");

var ianaTimeZoneName = jsRuntime.Invoke<string>("eval",
    "(function(){try { return ''+ Intl.DateTimeFormat().resolvedOptions().timeZone; } catch(e) {} return 'UTC';}())");

var object;

window.JsFunctionHelper = {MapSuccessResponse: function (instance, address) {
       object = instance;
       return instance.invokeMethodAsync("GetAddress", valuesFromApi);
       }
 };

 function getValuesFromApi() {
      .
      .
      .

      object.invokeMethodAsync("GetAddress", valuesFromApi);
 }

window.setFocus = function (element) {
  element.focus();
};

<input @ref="@ReferenceToInputControl" />

<input _bl_bc0f34fa-16bd-4687-a8eb-9e3838b5170d="">

private ElementReference ReferenceToInputControl;

await JSRuntime.InvokeVoidAsync("setFocus", ReferenceToInputControl);

{
  "compilerOptions": {
    "strict": true,
    "removeComments": false,
    "sourceMap": false,
    "noEmitOnError": true,
    "target": "ES2020",
    "module": "ES2020",
    "outDir": "wwwroot/scripts"
  },
  "include": [
    "Scripts/**/*.ts"
  ],
  "exclude": [
    "node_modules"
  ]
}

<Project Sdk="Microsoft.NET.Sdk.Razor">
  <ItemGroup>
    <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="4.3.5">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>
  <ItemGroup>
    <Content Remove="tsconfig.json" />
  </ItemGroup>
  <ItemGroup>
    <TypeScriptCompile Include="tsconfig.json">
      <CopyToOutputDirectory>Never</CopyToOutputDirectory>
    </TypeScriptCompile>
  </ItemGroup>
</Project>

window.exampleJsFunctions = {
  showPrompt: function (message) {
    return prompt(message, 'Type anything here');
  }
};

namespace JSInteropWithTypeScript {
   export class ExampleJsFunctions {
        public showPrompt(message: string): string {
            return prompt(message, 'Type anything here');
        }
    }
}

export function showPrompt(message: string): string {
   var fns = new JSInteropWithTypeScript. ExampleJsFunctions();
   return fns.showPrompt(message);
}

private const string ScriptPath = "./_content/----namespace-here---/scripts/file.js";
private IJSObjectReference scriptModule;

protected override async Task OnAfterRenderAsync(bool firstRender)
{
  if (scriptModule == null)
    scriptModule = await JSRuntime.InvokeAsync<IJSObjectReference>("import", ScriptPath);

await scriptModule.InvokeVoidAsync("exported fn name", params);

public partial class MyComponent : IAsyncDisposable

public async ValueTask DisposeAsync()
{
  if (scriptModule != null)
  {
    await scriptModule.DisposeAsync();
  }
}

export function error(){
    alert('oops, an error');
}

var module = await JS.InvokeAsync<IJSObjectReference>("import", "./Panel.razor.js");
await module.InvokeVoidAsync("error");

Pages/Panel.razor
Pages/Panel.razor.js
Pages/Panel.razor.css

_module = await JS.InvokeAsync<IJSObjectReference>("import", "./_content/RazorClassLibrary/componentName.razor.js");

export function showPrompt(message) {
  return prompt(message, 'Type anything here');
}

@page "/call-js-example-6"
@implements IAsyncDisposable
@inject IJSRuntime JS

<h1>Call JS Example 6</h1>

<p>
    <button @onclick="TriggerPrompt">Trigger browser window prompt</button>
</p>

<p>
    @result
</p>

@code {
    private IJSObjectReference? module;
    private string? result;

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            module = await JS.InvokeAsync<IJSObjectReference>("import", 
                "./scripts.js");
        }
    }

    private async Task TriggerPrompt()
    {
        result = await Prompt("Provide some text");
    }

    public async ValueTask<string?> Prompt(string message) =>
        module is not null ? 
            await module.InvokeAsync<string>("showPrompt", message) : null;

    async ValueTask IAsyncDisposable.DisposeAsync()
    {
        if (module is not null)
        {
            await module.DisposeAsync();
        }
    }
}

builder.RootComponents.RegisterForJavaScript<Counter>(identifier: "counter");

builder.Services.AddServerSideBlazor(options =>
{
    options.RootComponents.RegisterForJavaScript<Counter>(identifier: "counter");
});

<button onclick="callCounter()">Call Counter</button>

<script>
  async function callCounter() {
     let containerElement = document.getElementById('my-counter');
     await Blazor.rootComponents.add(containerElement, 'counter', { incrementAmount: 10 });      
  }
</script>
 
<div id="my-counter">
</div>

<input @oncustompaste="HandleCustomPaste" />

<script> 
    Blazor.registerCustomEventType('custompaste', { 
        browserEventName: 'paste', 
        createEventArgs: event => { 
            // This example only deals with pasting text, but you could use arbitrary JavaScript APIs 
            // to deal with users pasting other types of data, such as images 
            return { 
                eventTimestamp: new Date(), 
                pastedData: event.clipboardData.getData('text') 
            }; 
        } 
    }); 
</script>

namespace BlazorCustomEventArgs.CustomEvents 
{ 
    [EventHandler("oncustompaste", typeof(CustomPasteEventArgs), enableStopPropagation: true, enablePreventDefault: true)] 
    public static class EventHandlers 
    { 
        // This static class doesn't need to contain any members. It's just a place where we can put 
        // [EventHandler] attributes to configure event types on the Razor compiler. This affects the 
        // compiler output as well as code completions in the editor. 
    } 
 
    public class CustomPasteEventArgs : EventArgs 
    { 
        // Data for these properties will be supplied by custom JavaScript logic 
        public DateTime EventTimestamp { get; set; } 
        public string PastedData { get; set; } 
    } 
}

error RZ9992: Script tags should not be placed inside components because they cannot be updated dynamically.
To fix this, move the script tag to the 'index.html' file or another static location. For more information see https://go.microsoft.com/fwlink/?linkid=872131

<script suppress-error="BL9992" />

builder.RootComponents.RegisterAsCustomElement<Todo>("todo-element");

npx create-react-app blazor_react && cd blazor_react

<PackageReference Include="Microsoft.Web.LibraryManager.Build" Version="2.1.175" />