/**
 * @file datachannel-manager.ts
 * @description Bridges SCTP streams + DCEP to RTCDataChannel instances.
 * @module sctp/datachannel-manager
 *
 * Responsibilities:
 *  - Allocate SCTP stream IDs per RFC 8832 §6: the DTLS client (a=setup:active)
 *    uses even stream IDs, the DTLS server uses odd.
 *  - Send DATA_CHANNEL_OPEN and await DATA_CHANNEL_ACK; respond to inbound OPEN.
 *  - Map outgoing string/binary sends to the correct PPID, and incoming PPIDs
 *    back to string/binary, including the EMPTY variants for zero-length data.
 */
import { EventEmitter } from 'events';
import type { SctpAssociation } from './association';
import { RTCDataChannel } from '../datachannel/RTCDataChannel';
/** Subset of RTCDataChannelInit used when opening/accepting channels. */
interface ChannelInit {
    ordered?: boolean;
    maxRetransmits?: number | null;
    maxPacketLifeTime?: number | null;
    protocol?: string;
}
/** Information surfaced on the 'open-request' event for an inbound channel. */
export interface OpenRequestInfo {
    streamId: number;
    label: string;
    protocol: string;
    ordered: boolean;
    channelType: number;
    reliabilityParameter: number;
}
declare class DataChannelManager extends EventEmitter {
    #private;
    /**
     * @param {import('./association').SctpAssociation} association
     * @param {boolean} isDtlsClient - true if we are the DTLS client (even IDs)
     */
    constructor(association: SctpAssociation, isDtlsClient: boolean);
    /**
     * Open a channel initiated locally.
     * @param {import('../datachannel/RTCDataChannel').RTCDataChannel} channel
     * @param {Object} init - { ordered, maxRetransmits, maxPacketLifeTime, protocol }
     */
    openChannel(channel: RTCDataChannel, init?: ChannelInit): void;
    /** Tear down the manager: detach the SCTP listener and drop all channels. */
    close(): void;
    /**
     * Register an inbound channel (created in response to 'open-request') and
     * attach its sender.
     */
    acceptChannel(channel: RTCDataChannel, info: OpenRequestInfo): void;
}
export { DataChannelManager };