/**
 * Newline-delimited JSON framing for the box session host.
 *
 * The host reads a raw TCP stream, so it cuts the lines itself. Two properties
 * are load-bearing:
 *   - lines are cut on BYTES and decoded one whole line at a time, so a
 *     character split across two TCP chunks arrives intact;
 *   - the length cap trips as soon as the pending bytes pass it, not when a
 *     newline finally arrives. Otherwise a peer that never sends "\n" could make
 *     the host buffer without limit — and before the hello check, that peer is
 *     anyone who can reach the port.
 */
export interface LineSplitterOptions {
    /**
     * Longest allowed line in bytes, not counting the newline. A function is
     * re-read per chunk, which is how the connection holds a peer to a small cap
     * until it has signed in and a generous one afterwards.
     */
    maxLineBytes: number | (() => number);
    onLine: (line: string) => void;
    /** Called once, when a line passes the cap. Nothing is emitted afterwards. */
    onOverflow: () => void;
}
export interface LineSplitter {
    push(chunk: Buffer): void;
    /** Flush a final line that arrived without a trailing newline. */
    end(): void;
}
export declare function createLineSplitter(options: LineSplitterOptions): LineSplitter;
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