refactor: Use a database type.

src/databases/index.js

@@ -20,27 +20,23 @@ const databaseTypes = {}
 /**
  * Add a new database type.
  * @example
- * import { addDatabaseType } from 'orbitdb'
+ * import { useDatabaseType } from 'orbitdb'
  * const CustomDBTypeModule = async (params) => {
  *   const database = await Database(...params)
  *   ...
  * }
- * addDatabaseType(CustomDBTypeModule)
- * @function addDatabaseType
+ * useDatabaseType(CustomDBTypeModule)
+ * @function useDatabaseType
  * @param {module:Databases} database A Database-compatible module.
  * @throws Database type does not contain required field \'type\'.
  * @throws Database type '${store.type}' already added.
  * @memberof module:Databases
  */
-const addDatabaseType = (database) => {
+const useDatabaseType = (database) => {
   if (!database.type) {
     throw new Error('Database type does not contain required field \'type\'.')
   }
 
-  if (databaseTypes[database.type]) {
-    throw new Error(`Database type '${database.type}' already added.`)
-  }
-
   databaseTypes[database.type] = database
 }
 
@@ -56,9 +52,8 @@ const getDatabaseType = (type) => {
   return databaseTypes[type]
 }
 
-addDatabaseType(Events)
-addDatabaseType(Documents)
-addDatabaseType(KeyValue)
-addDatabaseType(KeyValueIndexed)
+useDatabaseType(Events)
+useDatabaseType(Documents)
+useDatabaseType(KeyValue)
 
-export { addDatabaseType, getDatabaseType, Documents, Events, KeyValue, KeyValueIndexed }
+export { useDatabaseType, getDatabaseType, Documents, Events, KeyValue, KeyValueIndexed }

src/databases/keyvalue-indexed.js

@@ -21,7 +21,6 @@ import KeyValue from './keyvalue.js'
 import LevelStorage from '../storage/level.js'
 import pathJoin from '../utils/path-join.js'
 
-const type = 'keyvalueindexed'
 const valueEncoding = 'json'
 
 /**
@@ -120,6 +119,4 @@ const KeyValueIndexed = ({ storage } = {}) => async ({ ipfs, identity, address,
   }
 }
 
-KeyValueIndexed.type = type
-
 export default KeyValueIndexed