import { ClientHttp2Session } from 'node:http2';
import { Logger } from './logger';
export interface ConnectionPoolOptions {
    secure?: boolean;
    auth?: string;
}
export interface Http2ConnectionPoolConfig {
    maxSessions?: number;
    sessionMaxAge?: number;
    connectionTimeout?: number;
}
export interface Http2Session {
    session: ClientHttp2Session;
    origin: string;
    lastUsed: number;
    activeStreams: number;
    maxConcurrentStreams: number;
}
export declare class Http2ConnectionPool {
    private sessions;
    private maxAge;
    private maxSessions;
    private connectionTimeout;
    private logger?;
    constructor(logger?: Logger, config?: Http2ConnectionPoolConfig);
    getSession(origin: string, options: ConnectionPoolOptions): ClientHttp2Session;
    canAcceptStream(origin: string): boolean;
    incrementActiveStreams(origin: string): void;
    decrementActiveStreams(origin: string): void;
    getAvailableSession(origin: string, options: ConnectionPoolOptions): ClientHttp2Session | null;
    private evictOldest;
    private cleanup;
    close(): void;
    getSessionCount(): number;
    hasSession(origin: string): boolean;
    _setMaxSessions(max: number): void;
    _setMaxAge(age: number): void;
    _getSessionLastUsed(origin: string): number | undefined;
}
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