/**
 * Log Hub Ring Buffer
 *
 * Fixed-size circular buffer for log entries.
 * Oldest entries are overwritten when full (FIFO).
 * Query iterates newest-first with optional filters.
 */
import type { LogEntry, LogLevel, LogStats } from './log-types.js';
export declare class LogBuffer {
    private readonly size;
    private buffer;
    private head;
    private count;
    private nextId;
    private sourcesSeen;
    private levelCounts;
    constructor(size: number);
    /**
     * Add a log entry to the buffer
     */
    push(level: LogLevel, source: string, message: string, data?: string, timestamp?: number): LogEntry;
    /**
     * Query entries newest-first with optional filters
     */
    query(opts?: {
        since?: number;
        level?: LogLevel;
        source?: string;
        contains?: string;
        limit?: number;
        consume?: boolean;
    }): LogEntry[];
    /**
     * Clear all entries
     */
    clear(): void;
    /**
     * Get buffer statistics
     */
    getStats(): Omit<LogStats, 'port' | 'persist' | 'pushSubscribers'>;
}
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