/**
 * Retain the newest bytes of one command-output stream under a hard bound.
 *
 * Bytes stay undecoded until the command closes, so a UTF-8 code point split
 * across ordinary stream chunks is not corrupted. The backing store grows
 * geometrically up to the configured cap and becomes a ring only when output
 * crosses it; no incoming chunk is retained by reference.
 */
export declare class BoundedTailCapture {
    private readonly capBytes;
    private storage;
    private start;
    private length;
    private lostBytes;
    constructor(capBytes: number);
    push(chunk: Buffer): void;
    /** Ordered copy of the retained raw bytes. */
    get bytes(): Buffer;
    get text(): string;
    get truncated(): boolean;
    /** Diagnostic invariant used by the internal killing observers. */
    get retainedBytes(): number;
    /** Diagnostic invariant used by the internal killing observers. */
    get allocatedBytes(): number;
    private ensureCapacity;
}
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