/**
 * @param obj
 * @returns
 */
export declare const isObject: (obj: unknown) => obj is Record<PropertyKey, unknown>;
/**
 * @param value
 * @returns
 */
export declare const isNumeric: (value: unknown) => boolean;
/**
 * Strict object type check. Only returns true for plain JavaScript objects
 *
 * @param obj
 * @returns
 */
export declare const isPlainObject: (obj: unknown) => obj is Record<PropertyKey, unknown>;
/**
 * Strict object type check. Only returns true for plain JavaScript objects
 *
 * @param obj
 * @returns
 */
export declare const isNull: (value: unknown) => value is null;