Add basic hashdb (wrong package) (#160)

packages/trie-db/src/Hash.ts

@@ -0,0 +1,25 @@
+// Copyright 2017-2018 @polkadot/trie-db authors & contributors
+// This software may be modified and distributed under the terms
+// of the MPL-2.0 license. See the LICENSE file for details.
+
+import { BaseDb } from './types';
+
+type StorageHash = {
+  [index: string]: Uint8Array
+};
+
+export default class HashDb implements BaseDb {
+  private storage: StorageHash = {};
+
+  del (key: Uint8Array): void {
+    delete this.storage[key.toString()];
+  }
+
+  get (key: Uint8Array): Uint8Array | null {
+    return this.storage[key.toString()] || null;
+  }
+
+  put (key: Uint8Array, value: Uint8Array): void {
+    this.storage[key.toString()] = value;
+  }
+}

packages/trie-db/src/types.d.ts

@@ -2,14 +2,15 @@
 // This software may be modified and distributed under the terms
 // of the MPL-2.0 license. See the LICENSE file for details.
 
-import { Trie$Pairs } from '@polkadot/trie-hash/types';
-
-export interface TrieDb {
-  checkpoint: () => void,
-  commit: () => void,
+export interface BaseDb {
   del: (key: Uint8Array) => void,
   get: (key: Uint8Array) => Uint8Array | null,
-  put: (key: Uint8Array, value: Uint8Array) => void,
+  put: (key: Uint8Array, value: Uint8Array) => void
+}
+
+export interface TrieDb extends BaseDb {
+  checkpoint: () => void,
+  commit: () => void,
   revert: () => void,
   trieRoot: () => Uint8Array
 }