Cleanup

node_modules/validator/es/lib/isBoolean.js

@@ -1,5 +1,16 @@
 import assertString from './util/assertString';
+var defaultOptions = {
+  loose: false
+};
+var strictBooleans = ['true', 'false', '1', '0'];
+var looseBooleans = [].concat(strictBooleans, ['yes', 'no']);
 export default function isBoolean(str) {
+  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : defaultOptions;
   assertString(str);
-  return ['true', 'false', '1', '0'].indexOf(str) >= 0;
+
+  if (options.loose) {
+    return looseBooleans.includes(str.toLowerCase());
+  }
+
+  return strictBooleans.includes(str);
 }