Class Extension

src/background/extension.ts:50–791

declare const __THUNDERBIRD__: boolean;

export class Extension {
    private static autoState: AutomationState = '';
    private static wasEnabledOnLastCheck: boolean | null = null;
    private static registeredContextMenus: boolean | null = null;
    /**
     * This value is used for two purposes:
     *  - to bypass Firefox bug
     *  - to filter out excessive Extension.onColorSchemeChange() invocations
     */
    private static wasLastColorSchemeDark: boolean | null = null;
    private static startBarrier: PromiseBarrier<void, void> | null = null;
    private static stateManager: StateManager<ExtensionState> | null = null;

    private static readonly ALARM_NAME = 'auto-time-alarm';
    private static readonly LOCAL_STORAGE_KEY = 'Extension-state';

    // Store system color theme
    private static readonly SYSTEM_COLOR_LOCAL_STORAGE_KEY = 'system-color-state';
    private static systemColorStateManager: StateManager<SystemColorState>;

    // Record whether Extension.init() already ran since the last GB start
    private static initialized = false;

    static isFirstLoad = false;

    // This sync initializer needs to run on every BG restart before anything else can happen
    private static init() {
        if (Extension.initialized) {
            return;
        }
        Extension.initialized = true;

        Messenger.init(Extension.getMessengerAdapter());
        TabManager.init({
            getConnectionMessage: Extension.getConnectionMessage,
            getTabMessage: Extension.getTabMessage,
            onColorSchemeChange: Extension.onColorSchemeChange,
        });

        Extension.startBarrier = new PromiseBarrier();
        Extension.stateManager = new StateManager<ExtensionState>(Extension.LOCAL_STORAGE_KEY, Extension, {
            autoState: '',
            wasEnabledOnLastCheck: null,
            registeredContextMenus: null,
        }, logWarn);

        chrome.alarms.onAlarm.addListener(Extension.alarmListener);

        if (chrome.commands) {
            // Firefox Android does not support chrome.commands
            if (isFirefox) {
                // Firefox may not register onCommand listener on extension startup so we need to use setTimeout
                setTimeout(() => chrome.commands.onCommand.addListener(async (command) => Extension.onCommand(command as Command, null, null, null)));
            } else {
                chrome.commands.onCommand.addListener(async (command, tab) => Extension.onCommand(command as Command, tab && tab.id! || null, 0, null));
            }
        }