expo Speech SDK

speak.js

_speak = (language, text) => {
  const { pitch, rate } = this.state;

  const start = () => {
    this.setState({ inProgress: true });
  };

  const complete = () => {
    this.state.inProgress && this.setState({ inProgress: false });
  };

  Speech.speak(text, {
    language,
    pitch,
    rate,
    onStart: start,
    onDone: complete,
    onStopped: complete,
    onError: complete
  });
};