export declare function notEmpty<TValue>(value: TValue | null | undefined): value is TValue;
export declare function isEmpty<TValue>(value: TValue | null | undefined): value is undefined;
export declare const convertToArray: <T>(val: T | T[]) => T[];
export declare function isString(value: any): value is string;
export declare function isStringArray(value: any | undefined | null): value is string[];
export declare function isNumber(value: any): value is number;
export declare function isNumberArray(values: any): values is number[];
export declare const isStringMatchRegex: (expressions: RegExp[], value: string) => boolean;
export declare const isNotEmptyString: (value: string | undefined) => value is string;
export declare const isEmptyString: (value: string) => value is never;
export declare const isAbsent: (value: string | number | boolean | undefined) => value is undefined;
export declare const isNotAbsent: (value: string | number | boolean | undefined | null) => value is string | number | boolean;
export declare const sleep: (milliSeconds?: number) => Promise<unknown>;
export declare function toString(obj: any): any;
export declare function isValueEqual(value: any, other: any): boolean;
export declare function isValueNotEqual(value: any, other: any): boolean;
export declare function convertToTrimmedString(val: unknown | undefined | string | number | boolean | null): string;