import { RMIMessageType } from "./types/RMIMessageType";
/**
 * Represents a function that narrows down the given data to a particular type. This is mainly used during JSON
 * validation.
 */
export declare type Validator<T> = (data: unknown) => data is T;
/**
 * Determines if the given data is null.
 *
 * @param data The data to narrow.
 */
export declare const isNull: Validator<null>;
/**
 * Determines if the given data is an object.
 *
 * @param data The data to narrow.
 */
export declare const isObject: Validator<object>;
/**
 * Determines if the given data is a string.
 *
 * @param data The data to narrow.
 */
export declare const isString: Validator<string>;
/**
 * Determines if the given string matches a valid RMIMessageType.
 *
 * @param data The data to narrow.
 */
export declare const isRMIMessageType: Validator<RMIMessageType>;
/**
 * Determines if the given data is a number.
 *
 * @param data The data to narrow.
 */
export declare const isNumber: Validator<number>;
/**
 * Determines if the given data is an array.
 *
 * @param data The data to narrow.
 */
export declare const isArray: Validator<unknown[]>;
/**
 * Determines if the given object has a particular key.
 *
 * @example
 * declare var obj: object;
 *
 * if (hasProperty(obj, "foo")) {
 *     obj.foo // foo exists on obj, and is of type unknown
 * }
 *
 * @param object The object to examine.
 * @param key The key to use in the given object.
 */
export declare const hasProperty: <T extends object, K extends string>(object: T, key: K) => object is T & { [key in K]: unknown; };
/**
 * Determines if the given object has a particular key that matches a given validator.
 *
 * @example
 * declare var obj: object;
 *
 * if (hasProperty(obj, "foo", isString)) {
 *     obj.foo // foo exists on obj, and is of type string
 * }
 *
 * @param object The object to examine.
 * @param key The key to use in the given object.
 * @param validator The validator that will narrow the type of object[key].
 */
export declare const hasPropertyOfType: <T extends object, K extends string, V>(object: T, key: K, validator: Validator<V>) => object is T & { [key in K]: V; };