service_worker.ts

/* eslint-disable no-empty */

// Subscribe to events
chrome.tabs.onRemoved.addListener(OnAnyTabRemoved);

// Spawn offscreen page
// Apaprently it needs to be async to be caugh, for whatever reason
(async () => {
    try { await chrome.offscreen.createDocument({ url: '/pages/offscreen.html', reasons: [chrome.offscreen.Reason.CLIPBOARD], justification: ''}); }
    catch (error) { console.log(error); }
})();


// LOGIC

function OnAnyTabRemoved(tabId: number, removeInfo: chrome.tabs.TabRemoveInfo): void
{
    const data: TabClosedInfo = { tabID: tabId, removeInfo: removeInfo };
    DispatchMessage(Action.TABREMOVED, Target.OFFSCREEN, data, false, `Tab ${tabId} removed`);
}


function DispatchMessage(action: Action, target: Target, data: any, waitForAnser: boolean, message: string): boolean
{   
    let result = false;
    const msg: APIMessage = {
        action: action,      
        result: data !== null,
        data: data,             
        target: target,      
        source: Target.WORKER,
        message: message
    };
    try {
        if (!waitForAnser) {
            chrome.runtime.sendMessage(msg);
        }
        else
        {
            chrome.runtime.sendMessage(msg, (response: APIMessage) => {
                if (!response || !response.source || response.source !== msg.target) {
                    console.log('Invalid response received');
                }
                else {
                    console.log('Response: ', response.message);
                    result = response.result;
                }
            });
        }
    }
    catch(error) { console.log('Dispatch Error:', error); }
    return result;
}