storage: downloadDir is not part of interface

src/storage/interface.js

@@ -19,7 +19,6 @@ exports = module.exports = {
     exists,
 
     download,
-    downloadDir,
     copy,
 
     listDir,
@@ -36,8 +35,7 @@ exports = module.exports = {
 
 const assert = require('assert'),
     BoxError = require('../boxerror.js'),
-    DataLayout = require('../datalayout.js'),
-    EventEmitter = require('events');
+    DataLayout = require('../datalayout.js');
 
 function removePrivateFields(apiConfig) {
     // in-place removal of tokens and api keys with constants.SECRET_PLACEHOLDER
@@ -89,16 +87,6 @@ function download(apiConfig, backupFilePath, callback) {
     callback(new BoxError(BoxError.NOT_IMPLEMENTED, 'download is not implemented'));
 }
 
-function downloadDir(apiConfig, backupFilePath, destDir) {
-    assert.strictEqual(typeof apiConfig, 'object');
-    assert.strictEqual(typeof backupFilePath, 'string');
-    assert.strictEqual(typeof destDir, 'string');
-
-    var events = new EventEmitter();
-    process.nextTick(function () { events.emit('done', null); });
-    return events;
-}
-
 async function copy(apiConfig, oldFilePath, newFilePath, progressCallback) {
     assert.strictEqual(typeof apiConfig, 'object');
     assert.strictEqual(typeof oldFilePath, 'string');