import { PropertyCollection } from "./Exports.js";
import { SpeechSynthesisRequestInputType } from "./SpeechSynthesisRequestInputType.js";
import { SpeechSynthesisRequestInputStream } from "./SpeechSynthesisRequestInputStream.js";
export { SpeechSynthesisRequestInputStream } from "./SpeechSynthesisRequestInputStream.js";
/**
 * Represents a speech synthesis request with support for text streaming.
 * Note: This class is in preview and may be subject to change in future versions.
 * @class SpeechSynthesisRequest
 */
export declare class SpeechSynthesisRequest {
    private privInputType;
    private privInputStream;
    private privProperties;
    private privTextPieceCallback;
    private privStreamCloseCallback;
    private privBufferedTextPieces;
    private privStreamClosedBeforeReady;
    /**
     * Creates a speech synthesis request.
     * @param inputType The input type for the speech synthesis request.
     */
    constructor(inputType: SpeechSynthesisRequestInputType);
    /**
     * Gets the input type of this request.
     */
    get inputType(): SpeechSynthesisRequestInputType;
    /**
     * Gets the input stream for writing text pieces.
     */
    get inputStream(): SpeechSynthesisRequestInputStream;
    /**
     * Gets the properties collection for this request.
     */
    get properties(): PropertyCollection;
    /**
     * Sets the pitch of the voice.
     */
    set pitch(value: string);
    /**
     * Sets the speaking rate of the voice.
     */
    set rate(value: string);
    /**
     * Sets the volume of the voice.
     */
    set volume(value: string);
    /**
     * Sets the style of the voice.
     */
    set style(value: string);
    /**
     * Sets the temperature of the voice synthesis.
     */
    set temperature(value: number);
    /**
     * Sets the custom lexicon URL.
     */
    set customLexiconUrl(value: string);
    /**
     * Sets the preferred locales for the voice.
     */
    set preferLocales(value: string);
    /**
     * @internal
     * Called by InputStream when a text piece is written.
     * Buffers text if no callback is registered yet.
     */
    onTextPieceReceived(text: string): void;
    /**
     * @internal
     * Called by InputStream when it is closed.
     * Buffers close event if no callback is registered yet.
     */
    onInputStreamClosed(): void;
    /**
     * @internal
     * Sets the callback for receiving text pieces.
     * Flushes any buffered text pieces immediately.
     */
    set onTextPiece(callback: (text: string) => void);
    /**
     * @internal
     * Sets the callback for stream close events.
     * Fires immediately if stream was already closed.
     */
    set onClose(callback: () => void);
}