Chrome Extension - Runtime onMessage Listener, meticulously crafted for capturing messages exchanged between content and background scripts in the context of Manifest v3.

chromeRuntimeOnMessageListener.ts

// Message and response are define in https://gist.github.com/EduardoAC/000b1e39a6ec10a892e7c6cd93730a53
chrome.runtime.onMessage.addListener((message: Message<T>, sender, sendResponse) => {
    if(sender.tab) { // Sender Tab useful mostly for background script
        switch(message.type) {
            case "review":
                // Tab is useful for instance to obtain the url to fetch the review from
                reviewHandler(sender.tab, message, sendResponse)
                break
            case "language":
                languageHandler(sender.tab, message, sendMessage)
                break
            default:
                sendResponse("Error: Not found message type")
                break
        }
        return true // This is really important, tells the extension whether is an ASYNCHRONOUS sendResponse or not
    }
    return false // False means synchronous response
})