Function sendMessage

src/inject/color-scheme-watcher.ts:11–40

(message: MessageCStoBG)

}

function sendMessage(message: MessageCStoBG): void {
    const responseHandler = (response: MessageBGtoCS | 'unsupportedSender' | undefined) => {
        // Vivaldi bug workaround. See TabManager for details.
        if (response === 'unsupportedSender') {
            cleanup();
        }
    };

    try {
        const promise = chrome.runtime.sendMessage<MessageCStoBG, MessageBGtoCS | 'unsupportedSender'>(message);
        promise.then(responseHandler).catch(cleanup);
    } catch (error) {
        /*
         * We get here if Background context is unreachable which occurs when:
         *  - extension was disabled
         *  - extension was uninstalled
         *  - extension was updated and this is the old instance of content script
         *
         * Any async operations can be ignored here, but sync ones should run to completion.
         *
         * Regular message passing errors are returned via rejected promise or runtime.lastError.
         */
        if ((error as Error).message === 'Extension context invalidated.') {
            console.log('Dark Reader: instance of old CS detected, cleaning up.');
            cleanup();
        } else {
            console.log('Dark Reader: unexpected error during message passing.');
        }
    }
}

function notifyOfColorScheme(isDark: boolean): void {
    sendMessage({type: MessageTypeCStoBG.COLOR_SCHEME_CHANGE, data: {isDark}});