Генератор речи

main.js

speaker.say('Как у вас дела?').then(speaker.say('У меня норм, например.'));

speaker.js

var speaker = (function () {

	var speechUtteranceChunker = function (utt, settings, callback) {
		settings = settings || {};

		var chunkLength = settings.chunkLength || 160;
		var pattRegex = new RegExp('^.{' + Math.floor(chunkLength / 2) + ',' + chunkLength + '}[\.\!\?\,]{1}|^.{1,' + chunkLength + '}$|^.{1,' + chunkLength + '} ');
		var txt = (settings.offset !== undefined ? utt.text.substring(settings.offset) : utt.text);
		var chunkArr = txt.match(pattRegex);

		if (chunkArr[0] !== undefined && chunkArr[0].length > 2) {
			var chunk = chunkArr[0];
			var newUtt = new SpeechSynthesisUtterance(chunk);

			for (x in utt) {
				if (utt.hasOwnProperty(x) && x !== 'text') {
					newUtt[x] = utt[x];
				};
			};

			newUtt.onend = function () {
				settings.offset = settings.offset || 0;
				settings.offset += chunk.length - 1;
				speechUtteranceChunker(utt, settings, callback);
			};

			setTimeout(function () {
				speechSynthesis.speak(newUtt);
			}, 0);
		}
		else {
			if (callback !== undefined) {
				callback();
			};
		};
	};

	function say (text) {
		return new Promise(function(resolve, reject) {
			var utterance = new SpeechSynthesisUtterance(text);
			var voiceArr = speechSynthesis.getVoices();

			utterance.voice = voiceArr[2];
			speechUtteranceChunker(utterance, {
				chunkLength: 120
			}, resolve);
		});
	};

	return {
		say: say
	};

})();