notes/node_modules/camelcase/index.js

'use strict';

function preserveCamelCase(str) {
	var isLastCharLower = false;

	for (var i = 0; i < str.length; i++) {
		var c = str.charAt(i);

		if (isLastCharLower && (/[a-zA-Z]/).test(c) && c.toUpperCase() === c) {
			str = str.substr(0, i) + '-' + str.substr(i);
			isLastCharLower = false;
			i++;
		} else {
			isLastCharLower = (c.toLowerCase() === c);
		}
	}

	return str;
}

module.exports = function () {
	var str = [].map.call(arguments, function (str) {
		return str.trim();
	}).filter(function (str) {
		return str.length;
	}).join('-');

	if (!str.length) {
		return '';
	}

	if (str.length === 1) {
		return str;
	}

	if (!(/[_.\- ]+/).test(str)) {
		if (str === str.toUpperCase()) {
			return str.toLowerCase();
		}

		if (str[0] !== str[0].toLowerCase()) {
			return str[0].toLowerCase() + str.slice(1);
		}

		return str;
	}

	str = preserveCamelCase(str);

	return str
	.replace(/^[_.\- ]+/, '')
	.toLowerCase()
	.replace(/[_.\- ]+(\w|$)/g, function (m, p1) {
		return p1.toUpperCase();
	});
};