react-say/lib/createNativeUtterance.js

[](https://badge.fury.io/js/react-say) [](https://travis-ci.org/compulim/react-say)

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = createNativeUtterance;

function createNativeUtterance(_ref, _ref2) {
  var speechSynthesis = _ref.speechSynthesis,
      SpeechSynthesisUtterance = _ref.SpeechSynthesisUtterance;
  var lang = _ref2.lang,
      onBoundary = _ref2.onBoundary,
      pitch = _ref2.pitch,
      rate = _ref2.rate,
      text = _ref2.text,
      voice = _ref2.voice,
      volume = _ref2.volume;
  var utterance = new SpeechSynthesisUtterance(text);
  var targetVoice;

  if (typeof voice === 'function') {
    targetVoice = voice.call(speechSynthesis, speechSynthesis.getVoices());
  } else {
    var _ref3 = voice || {},
        voiceURI = _ref3.voiceURI;

    targetVoice = voiceURI && [].find.call([].slice.call(speechSynthesis.getVoices()), function (v) {
      return v.voiceURI === voiceURI;
    });
  } // Edge will mute if "lang" is set to ""


  utterance.lang = lang || '';

  if (pitch || pitch === 0) {
    utterance.pitch = pitch;
  }

  if (rate || rate === 0) {
    utterance.rate = rate;
  } // Cognitive Services will error when "voice" is set to "null"
  // Edge will error when "voice" is set to "undefined"


  if (targetVoice) {
    utterance.voice = targetVoice;
  }

  if (volume || volume === 0) {
    utterance.volume = volume;
  } // Since browser quirks, start/error/end events are emulated for best compatibility
  // start/error/end events are emulated in QueuedUtterance


  onBoundary && utterance.addEventListener('boundary', onBoundary); // onEnd && utterance.addEventListener('end', onEnd);
  // onError && utterance.addEventListener('error', onError);
  // onStart && utterance.addEventListener('start', onStart);

  return utterance;
}
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