export declare function assertMaybePotentiallyUnsafeDate(name: string, mixed: any): (null | undefined | (Date)) | never;
export declare function assertMaybeValidDate(name: string, mixed: any): (null | undefined | (Date)) | never;
export declare function assertMaybeBefore(name: string, mixed: any, x: Date): (null | undefined | (Date)) | never;
export declare function assertMaybeBeforeHandler(x: Date): (name: string, mixed: any) => (null | undefined | (Date)) | never;
export declare function assertMaybeAfter(name: string, mixed: any, x: Date): (null | undefined | (Date)) | never;
export declare function assertMaybeAfterHandler(x: Date): (name: string, mixed: any) => (null | undefined | (Date)) | never;
export declare function assertMaybeBeforeOrAt(name: string, mixed: any, x: Date): (null | undefined | (Date)) | never;
export declare function assertMaybeBeforeOrAtHandler(x: Date): (name: string, mixed: any) => (null | undefined | (Date)) | never;
export declare function assertMaybeAfterOrAt(name: string, mixed: any, x: Date): (null | undefined | (Date)) | never;
export declare function assertMaybeAfterOrAtHandler(x: Date): (name: string, mixed: any) => (null | undefined | (Date)) | never;
export declare function assertMaybeRange(name: string, mixed: any, args: {
    min?: Date;
    max?: Date;
}): (null | undefined | (Date)) | never;
export declare function assertMaybeRangeHandler(args: {
    min?: Date;
    max?: Date;
}): (name: string, mixed: any) => (null | undefined | (Date)) | never;