import * as React from 'react';
export interface StreamingTextHandle {
    /** Replaces the text. Same-frame calls coalesce into one commit (next animation frame). */
    setText(text: string): void;
    /** Appends a chunk. Same-frame calls coalesce into one commit (next animation frame). */
    append(chunk: string): void;
}
export interface StreamingTextProps {
    /** Text received so far. */
    text: string;
    /** More text is still arriving; shows the streaming cursor. */
    streaming?: boolean | undefined;
    /** Live-annunciation policy; complete announcements go through the MAT announcer. */
    announce?: 'complete' | 'sentences' | 'off' | undefined;
    /** Class name merged onto the root element. */
    className?: string | undefined;
    /** Imperative token sink: `setText`/`append` from a transport without re-rendering the parent. */
    ref?: React.Ref<StreamingTextHandle> | undefined;
}
/** REQ-SURF-113: the complete announcement is capped; the transcript keeps the rest. */
export declare const ANNOUNCE_MAX_CHARS = 600;
export declare const ANNOUNCE_TRUNCATION_SUFFIX = "\u2026response continues in the conversation";
/** REQ-SURF-113: `announce="sentences"` batches are at least this far apart. */
export declare const SENTENCE_BATCH_MS = 1000;
export declare function truncateAnnouncement(text: string): string;
/**
 * REQ-SURF-113: renders `text` plus a blinking caret while `streaming`.
 * Imperative writes through the `ref` handle are coalesced by a per-instance
 * external store (`useSyncExternalStore`) flushed in one animation frame, so
 * 1,000 `setText` calls in one frame make one commit. The content carries
 * `aria-busy` only while streaming; speech goes through the MAT announcer.
 */
export declare const StreamingText: React.NamedExoticComponent<StreamingTextProps>;
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