import { ShareType } from "../share/share-type";
export declare function getReferrer(): string;
/**
 * Detect the best share type, based on the browser's user agent and referrer URL. For example, this
 * will return 'facebook' if the game was launched from clicking a Facebook post, or is being played
 * inside the Facebook mobile app.
 *
 * You can use this to create a share button that the player is more likely to engage with.
 */
export declare function getBestShareType(): ShareType;
export declare function isWebview(): boolean;
interface BeforeInstallPromptEvent extends Event {
    prompt(): Promise<{
        outcome: "accepted" | "dismissed";
    }>;
}
declare global {
    interface WindowEventMap {
        beforeinstallprompt: BeforeInstallPromptEvent;
    }
}
/** The current installation state of the PWA. */
export declare enum InstallState {
    /** The PWA hasn't been installed yet, but we can prompt the user to install. */
    Installable = "installable",
    /** The player's browser doesn't support PWA installation, or the PWA is misconfigured. */
    Unsupported = "unsupported"
}
export declare function getInstallState(): InstallState;
/**
 * Requests the player to install the PWA to their home screen.
 * @returns Whether the installation was accepted by the player.
 */
export declare function requestInstall(): Promise<boolean>;
export {};