blob: 8d5bab7e4672ffd15fba27ce1a68235453e89417 [file] [log] [blame]
'use strict';
module.exports = function (str, sep) {
if (typeof str !== 'string') {
throw new TypeError('Expected a string');
}
sep = typeof sep === 'undefined' ? '_' : sep;
return str
.replace(/([a-z\d])([A-Z])/g, '$1' + sep + '$2')
.replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1' + sep + '$2')
.toLowerCase();
};