use directories for structure

node_modules/acorn-dynamic-import/lib/walk.js

@@ -0,0 +1,16 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports['default'] = inject;
+
+var _index = require('./index');
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+function inject(injectableWalk) {
+  return Object.assign({}, injectableWalk, {
+    base: Object.assign({}, injectableWalk.base, _defineProperty({}, _index.DynamicImportKey, function () {}))
+  });
+}