import { BaseClient } from '../../core/BaseClient';
import { LogStreamConfig } from '../../core/types';
import { LogContext, LogEntry } from '@ologstream/types';
export declare class BrowserClient extends BaseClient {
    private beaconTransport;
    private beforeUnloadListener?;
    constructor(config: LogStreamConfig);
    protected collectContext(): LogContext;
    protected setupGracefulShutdown(): void;
    private setupBeforeUnload;
    private flushWithBeacon;
    capture(level: string, message: string, source: LogEntry['source'], metadata?: Record<string, any>): void;
    destroy(): void;
}