[Poly > Mkdirp] Simplify exporting

polyfills/mkdirp.js

@@ -1,9 +1,6 @@
 // Minimal wrapper mimicking mkdirp package
-exports.__esModule = true; // Makes moduleUpdater internals load properly
-
 const fs = require('fs');
 
-
 const async = (path, callback) => { // async
   log('Mkdirp', 'Async:', path);
 
@@ -20,7 +17,5 @@ const sync = (path) => { // sync
   } catch (e) { } // Already exists, ignore
 };
 
-const toExport = async;
-toExport.sync = sync;
-
-exports.default = toExport;
+async.sync = sync;
+module.exports = async;