/**
 * Ring Buffer for incoming messages.
 *
 * Fixed-capacity circular buffer. Oldest messages are overwritten
 * when capacity is exceeded. O(1) push, O(n) scan.
 */
import type { ChannelMessage } from './adapter.js';
export declare class MessageBuffer {
    private capacity;
    private buffer;
    private head;
    private count;
    constructor(capacity?: number);
    /** Push a message. Overwrites oldest if at capacity. */
    push(message: ChannelMessage): void;
    /** Get messages newer than the given timestamp. */
    getSince(timestamp: number): ChannelMessage[];
    /** Get the most recent N messages (newest last). */
    getRecent(limit: number): ChannelMessage[];
    /** Get all messages in chronological order. */
    toArray(): ChannelMessage[];
    /** Clear all messages. */
    clear(): void;
    get size(): number;
}
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