[Refactor] sync: add function name

Author: ljharb

lib/sync.js

@@ -46,7 +46,7 @@ var getPackageCandidates = function getPackageCandidates(x, start, opts) {
     return dirs;
 };
 
-module.exports = function (x, options) {
+module.exports = function resolveSync(x, options) {
     if (typeof x !== 'string') {
         throw new TypeError('Path must be a string.');
     }