/**
 * Defines the boundary type of speech synthesis boundary event.
 * @class SpeechSynthesisBoundaryType
 * Added in version 1.21.0
 */
export declare enum SpeechSynthesisBoundaryType {
    /**
     * Indicates the boundary text is a word.
     * @member SpeechSynthesisBoundaryType.Word
     */
    Word = "WordBoundary",
    /**
     * Indicates the boundary text is a punctuation.
     * @member SpeechSynthesisBoundaryType.Punctuation
     */
    Punctuation = "PunctuationBoundary",
    /**
     * Indicates the boundary text is a sentence.
     * @member SpeechSynthesisBoundaryType.Sentence
     */
    Sentence = "SentenceBoundary"
}