import type { OutputChunkRef, ToolCallId } from "./app-event.js";
export interface BoundedTextState {
    readonly tail: string;
    readonly totalBytes: number;
    readonly droppedBytes: number;
    readonly truncated: boolean;
}
export declare class BoundedText {
    private readonly maxChars;
    private tailBuf;
    private total;
    private dropped;
    /**
     * @param maxChars Finite positive cap keeps only the last N chars.
     *   Defaults to 256 KiB; use Infinity only in explicitly controlled tests.
     */
    constructor(maxChars?: number);
    append(chunk: string): void;
    /** Replace with an authoritative body while preserving the configured cap. */
    replace(text: string): void;
    get tail(): string;
    get totalBytes(): number;
    get droppedBytes(): number;
    get truncated(): boolean;
    snapshot(): BoundedTextState;
}
export declare class OutputSpool {
    private readonly maxCharsPerTool;
    private readonly maxTools;
    private readonly byTool;
    /** Finite production defaults; full bodies remain available in tool artifacts. */
    constructor(maxCharsPerTool?: number, maxTools?: number);
    private bufferFor;
    append(toolCallId: ToolCallId, chunk: string): OutputChunkRef;
    replace(toolCallId: ToolCallId, text: string): OutputChunkRef;
    tail(toolCallId: ToolCallId): string;
    state(toolCallId: ToolCallId): BoundedTextState | undefined;
    has(toolCallId: ToolCallId): boolean;
    clear(): void;
}