export declare const checkNotEmpty: (value: unknown) => boolean;
export declare const checkEmpty: (value: unknown) => boolean;
export declare const greaterThan: (value: number, comparator: number) => boolean;
export declare const validDate: (value: string) => boolean;
export declare const equal: (a: unknown, b: unknown) => boolean;
export declare const notEqual: (a: unknown, b: unknown) => boolean;
export declare const isNull: (a: unknown) => boolean;
export declare const isNotNull: (a: unknown) => boolean;
export declare const isIn: <T>(a: T, b: T[]) => boolean;
export declare const isNotIn: <T>(a: T, b: T[]) => boolean;
export declare const greaterThanOrEquals: (value: number, comparator: number) => boolean;
export declare const lessThanOrEquals: (value: number, comparator: number) => boolean;
export declare const startsWith: (value: unknown, comparator: string) => boolean;
export declare const contains: (value: unknown, comparator: string) => boolean;