/// <reference path="../../../third_party/freedom-typings/freedom-common.d.ts" />
/// <reference path="../../../third_party/freedom-typings/udp-socket.d.ts" />
/// <reference path="../../../third_party/typings/es6-promise/es6-promise.d.ts" />
/**
 * Freedom module which handles relay sockets for the TURN server.
 */
declare class Backend {
    private dispatchEvent_;
    /**
     * All clients currently known to the server, indexed by tag.
     * Note that this map is essentially the (extremely inaccurately) named
     * "5-tuple" introduced in section 2.2 of the TURN RFC:
     *   http://tools.ietf.org/html/rfc5766#section-2.2
     */
    private allocations_;
    constructor(dispatchEvent_?: (name: string, args: any) => void);
    handleIpc: (data: ArrayBuffer) => Promise<void>;
    /**
     * Emits a Freedom message which should be relayed to the remote side.
     * The message is a STUN message, as received from a TURN client but with
     * the addition of an IPC_TAG attribute identifying the TURN client.
     */
    private emitIpc_;
    /** Promises to allocate a socket, wrapped in an Allocation. */
    private makeAllocation_;
    /**
     * Copies a Uint8Array into a new ArrayBuffer. Useful when the array
     * has been constructed from a subarray of the buffer, in which case
     * bytes.buffer is a much larger array than you are expecting.
     * TODO: be smarter about using slice in these instances
     */
    private static bytesToArrayBuffer_;
    private static getRandomTransactionId_;
}
export = Backend;