How to use JS isolation in a synchronous wasm app?

[user72356]

I can't seem to get JS isolation to work in a wasm Blazor app, using synchronous calls only. This is my attempt:

var jsInProcessRuntime = (JSInProcessRuntime)JSRuntime;
var module = jsInProcessRuntime.Invoke<IJSInProcessObjectReference>("import", "./exampleJsInterop.js");
module.Invoke<string>("showPrompt", "What's up?");

I'm getting the following error:

blazor.webassembly.js:1 Microsoft.JSInterop.JSException: Could not find 'showPrompt' ('showPrompt' was undefined).

It works perfectly well when using asynchronous calls and the regular JSRuntime...

[user72356]

Solved it with some extra research:

var module = await JSRuntime.InvokeAsync<IJSInProcessObjectReference>("import", "./exampleJsInterop.js");
module.Invoke<string>("showPrompt", "What's up?");