export declare function promiseMaybePotentiallyUnsafeDateString(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeValidDateString(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeBeforeString(name: string, mixed: any, x: Date): Promise<null | undefined | (string)>;
export declare function promiseMaybeBeforeStringHandler(x: Date): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeAfterString(name: string, mixed: any, x: Date): Promise<null | undefined | (string)>;
export declare function promiseMaybeAfterStringHandler(x: Date): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeBeforeOrAtString(name: string, mixed: any, x: Date): Promise<null | undefined | (string)>;
export declare function promiseMaybeBeforeOrAtStringHandler(x: Date): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeAfterOrAtString(name: string, mixed: any, x: Date): Promise<null | undefined | (string)>;
export declare function promiseMaybeAfterOrAtStringHandler(x: Date): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeRangeString(name: string, mixed: any, args: {
    min?: Date;
    max?: Date;
}): Promise<null | undefined | (string)>;
export declare function promiseMaybeRangeStringHandler(args: {
    min?: Date;
    max?: Date;
}): (name: string, mixed: any) => Promise<null | undefined | (string)>;