/**
 * LogBuffer — fixed-capacity ring buffer for capturing process stdout/stderr lines.
 * When the buffer is full, the oldest lines are evicted (FIFO).
 * @docLink packages/connectors/api-reference#log-buffer
 */
export declare class LogBuffer {
    private readonly lines;
    private readonly capacity;
    constructor(capacity?: number);
    /** Append a single line. */
    push(line: string): void;
    /** Split text on newlines and push each line (preserves empty lines). */
    pushLines(text: string): void;
    /** Return the last `n` lines. */
    tail(n: number): string[];
    /** Clear all stored lines. */
    clear(): void;
    /** Current number of stored lines. */
    get size(): number;
}
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