/**
 * Gets the stream ID for a channel, if one exists.
 * @param channelName - The channel name to look up.
 * @returns The stream ID if found, undefined otherwise.
 */
export declare function getChannelStreamId(channelName: string): number | undefined;
/**
 * Associates a channel name with a stream ID.
 * @param channelName - The channel name.
 * @param streamId - The stream ID to associate.
 */
export declare function setChannelStreamId(channelName: string, streamId: number): void;
/**
 * Removes the channel-to-stream mapping for a channel.
 * @param channelName - The channel name to remove.
 */
export declare function deleteChannelStreamId(channelName: string): void;
/**
 * Checks if termination has been initiated for a stream.
 * @param streamId - The stream ID to check.
 * @returns True if termination has been initiated, false otherwise.
 */
export declare function isTerminationInitiated(streamId: number): boolean;
/**
 * Terminates a stream, cleaning up all resources. This is the authoritative termination function that all code paths should use for consistent cleanup.
 *
 * Note: This function does NOT call emitCurrentSystemStatus() to avoid circular dependencies with the browser module. Callers should call emitCurrentSystemStatus()
 * after termination if they need to update the SSE system status.
 * @param streamId - The numeric stream ID.
 * @param channelName - The channel name for channel mapping cleanup.
 * @param reason - The reason for termination (e.g., "idle timeout", "circuit breaker").
 */
export declare function terminateStream(streamId: number, channelName: string, reason: string): void;