/**
 * SSE 文本合并缓冲 — 避免发送过多小块
 */
export interface CoalescerOptions {
    sizeThreshold: number;
    idleTimeoutMs: number;
    onFlush: (text: string) => void;
    /** buffer 硬上限（字节），超过强制 flush，默认 1MB */
    maxBufferSize?: number;
}
export declare class TextCoalescer {
    private readonly opts;
    private buffer;
    private timer;
    private readonly maxBufferSize;
    private destroyed;
    constructor(opts: CoalescerOptions);
    push(text: string): void;
    flush(): void;
    private resetTimer;
    private clearTimer;
    destroy(): void;
}
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