/** Public Responses reasoning text only; encrypted replay payloads are never read. */
type Family = 'summary' | 'raw';
export declare function responseIndex(value: unknown): number | undefined;
/**
 * Append-only public text for one output item. Snapshots complete streamed
 * prefixes rather than repeating them. If both public representations occur,
 * stream the first and retain the other until item end so an identical mirror
 * can be omitted without dropping a distinct public summary.
 */
export declare class ResponsesReasoningText {
    private family;
    private readonly parts;
    private emitted;
    private finished;
    get text(): string;
    private render;
    update(family: Family, index: unknown, value: unknown, done: boolean): string;
    /** Only recognized public text fields are examined; no copying of the item. */
    snapshot(item: unknown): string;
    /** Flush a distinct secondary representation, including on failure/abort. */
    finish(): string;
}
export {};
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