export declare function userSystemsDir(): string;
export declare function isSafeSystemId(id: string): boolean;
export declare function bundledSystemPath(id: string): string | null;
export declare function userSystemPath(id: string): string | null;
export declare function storedSystemPath(id: string): string | null;
export declare function loadStoredSystem(id: string): any | null;
export declare function userSystemsDirProblem(): string | null;
export declare function listUserSystemIds(): string[];
export declare function saveUserSystem(id: string, system: object): {
    id: string;
    path: string;
};