key should be labeled ~Key

browser/main/lib/dataApi/deleteFolder.js

@@ -13,7 +13,7 @@ const sander = require('sander')
  * ```
  * {
  *   storage: Object,
- *   folder: folderKey
+ *   folderKey: String
  * }
  * ```
  */
@@ -67,7 +67,7 @@ function deleteFolder (storageKey, folderKey) {
 
       return {
         storage,
-        folder: folderKey
+        folderKey
       }
     })
 }

browser/main/lib/dataApi/removeStorage.js

@@ -22,7 +22,9 @@ function removeStorage (key) {
 
   localStorage.setItem('storages', JSON.stringify(rawStorages))
 
-  return Promise.resolve(key)
+  return Promise.resolve({
+    storageKey: key
+  })
 }
 
 module.exports = removeStorage