export declare function assertPotentiallyUnsafeDateString(name: string, mixed: any): (string) | never;
export declare function assertValidDateString(name: string, mixed: any): (string) | never;
export declare function assertBeforeString(name: string, mixed: any, x: Date): (string) | never;
export declare function assertBeforeStringHandler(x: Date): (name: string, mixed: any) => (string) | never;
export declare function assertAfterString(name: string, mixed: any, x: Date): (string) | never;
export declare function assertAfterStringHandler(x: Date): (name: string, mixed: any) => (string) | never;
export declare function assertBeforeOrAtString(name: string, mixed: any, x: Date): (string) | never;
export declare function assertBeforeOrAtStringHandler(x: Date): (name: string, mixed: any) => (string) | never;
export declare function assertAfterOrAtString(name: string, mixed: any, x: Date): (string) | never;
export declare function assertAfterOrAtStringHandler(x: Date): (name: string, mixed: any) => (string) | never;
export declare function assertRangeString(name: string, mixed: any, args: {
    min?: Date;
    max?: Date;
}): (string) | never;
export declare function assertRangeStringHandler(args: {
    min?: Date;
    max?: Date;
}): (name: string, mixed: any) => (string) | never;