[Feature Request] TypeScript definitions for window.chrome.webview

Describe the feature/enhancement you need
Global TypeScript Interface for window.chrome.webview

The scenario/use case where you would use this feature
When developing using Typescript while using WebView2

Refer to the discussion for further context.

Discussed in https://github.com/MicrosoftEdge/WebView2Feedback/discussions/4028

^{Originally posted by danbahrami March 7, 2023}
Hi, I'm looking through the WebView2 docs and can't find any API reference for window.chrome.webview. Specifically I'm looking to define a global TypeScript interface for window.chrome.webview.postMessage and window.chrome.webview.addEventListener.

I have a couple of questions:

1. What's the method for removing event listeners?

I can't tell if window.chrome.addEventListener returns an unsubscribe callback or if there's an adjacent removeEventListener that behaves the same as adding/removing DOM events.

2. Do you have a recommendation for a global TypeScript definition?

Here's what I've got so far but I'm not sure if it's accurate

declare global {
    interface Window {
        chrome?: {
            webview?: {
                addEventListener: (
                    message: string,
                    handler: (event: any) => void, // not sure yet what the event type should be
                ) => void;
                postMessage: (message: string) => void;
            };
        };
    }
}

AB#40423422