import type { TranscribeTranscriptData } from "../../api/types/TranscribeTranscriptData.js";
export interface DictationTranscriptSnapshot {
    /** Finalized text. Use this for copy, clear, and JSON export. */
    committedText: string;
    /**
     * Active interim preview. Empty string when none.
     * Includes its leading boundary space so the UI can render it verbatim
     * immediately after committedText.
     */
    interimText: string;
    /** @internal */
    _finalizedStarts: ReadonlySet<number>;
    /** @internal */
    _latestFinalEnd: number;
}
/**
 * Pure function that applies a single transcript message to the previous
 * snapshot and returns a new snapshot with updated committed/interim text.
 *
 * - Handles the two-layer committed + interim model (DXG-844).
 * - Ignores late interims that overlap an already-finalized timeline (DXG-1093).
 *
 * @param previous - The last snapshot, or `undefined` on first call.
 * @param message  - The incoming transcript packet (subset of TranscribeTranscriptData).
 */
export declare function applyDictationTranscript(previous: DictationTranscriptSnapshot | undefined, message: Pick<TranscribeTranscriptData, "text" | "start" | "end" | "isFinal">): DictationTranscriptSnapshot;