export interface BeforeInstallPromptEvent extends Event {
    readonly platforms: string[];
    readonly userChoice: Promise<{
        outcome: 'accepted' | 'dismissed';
        platform: string;
    }>;
    prompt(): Promise<void>;
}
export interface Options {
    acceptedFn?: () => void;
    dismissedFn?: () => void;
    installedFn?: () => void;
}
export interface ReturnType {
    isInstalled: boolean;
    install: () => Promise<false | void>;
}
declare global {
    interface WindowEventMap {
        beforeinstallprompt: BeforeInstallPromptEvent;
    }
}