export declare function assertMaybePotentiallyUnsafeDateString(name: string, mixed: any): (null | undefined | (string)) | never;
export declare function assertMaybeValidDateString(name: string, mixed: any): (null | undefined | (string)) | never;
export declare function assertMaybeBeforeString(name: string, mixed: any, x: Date): (null | undefined | (string)) | never;
export declare function assertMaybeBeforeStringHandler(x: Date): (name: string, mixed: any) => (null | undefined | (string)) | never;
export declare function assertMaybeAfterString(name: string, mixed: any, x: Date): (null | undefined | (string)) | never;
export declare function assertMaybeAfterStringHandler(x: Date): (name: string, mixed: any) => (null | undefined | (string)) | never;
export declare function assertMaybeBeforeOrAtString(name: string, mixed: any, x: Date): (null | undefined | (string)) | never;
export declare function assertMaybeBeforeOrAtStringHandler(x: Date): (name: string, mixed: any) => (null | undefined | (string)) | never;
export declare function assertMaybeAfterOrAtString(name: string, mixed: any, x: Date): (null | undefined | (string)) | never;
export declare function assertMaybeAfterOrAtStringHandler(x: Date): (name: string, mixed: any) => (null | undefined | (string)) | never;
export declare function assertMaybeRangeString(name: string, mixed: any, args: {
    min?: Date;
    max?: Date;
}): (null | undefined | (string)) | never;
export declare function assertMaybeRangeStringHandler(args: {
    min?: Date;
    max?: Date;
}): (name: string, mixed: any) => (null | undefined | (string)) | never;