Interface SpeechSynthesisErrorEventInit

interface SpeechSynthesisErrorEventInit {
    bubbles?: boolean;
    cancelable?: boolean;
    charIndex?: number;
    charLength?: number;
    composed?: boolean;
    elapsedTime?: number;
    error: SpeechSynthesisErrorCode;
    name?: string;
    utterance: SpeechSynthesisUtterance;
}