/** Returns true if this value is an array */
export declare function IsArray(value: unknown): value is unknown[];
/** Returns true if this value is null */
export declare function IsNull(value: unknown): value is null;
/** Returns true if this value is an object */
export declare function IsObject(value: unknown): value is Record<PropertyKey, unknown>;
/** Returns true if this value is string */
export declare function IsString(value: unknown): value is string;
export declare function IsEqual(left: unknown, right: unknown): boolean;
/** Returns true if this value has this property key */
export declare function HasPropertyKey<Key extends PropertyKey>(value: object, key: Key): value is {
    [_ in Key]: unknown;
};