Properly type the return type of the storage deserializer

It's only a subset of the full state.

Author: shepmaster

ui/frontend/package.json

@@ -69,6 +69,7 @@
     "stylelint-config-idiomatic-order": "^8.1.0",
     "stylelint-config-prettier": "^9.0.3",
     "stylelint-config-standard": "^24.0.0",
+    "ts-essentials": "^9.0.0",
     "ts-jest": "^27.0.0",
     "ts-loader": "^9.2.3",
     "typescript": "^4.2.2",

ui/frontend/storage.ts

@@ -1,12 +1,13 @@
 import { merge } from 'lodash';
 import { StoreEnhancer, StoreEnhancerStoreCreator } from 'redux';
+import { DeepPartial } from 'ts-essentials';
 
 type SimpleStorage = Pick<Storage, 'getItem' | 'setItem'>;
 
 interface Config<S> {
   storageFactory: () => SimpleStorage;
   serialize: (state: S) => string;
-  deserialize: (state: string) => S;
+  deserialize: (state: string) => DeepPartial<S>;
 }
 
 export class InMemoryStorage {

ui/frontend/yarn.lock

@@ -6157,6 +6157,11 @@ ts-easing@^0.2.0:
   resolved "https://registry.yarnpkg.com/ts-easing/-/ts-easing-0.2.0.tgz#c8a8a35025105566588d87dbda05dd7fbfa5a4ec"
   integrity sha512-Z86EW+fFFh/IFB1fqQ3/+7Zpf9t2ebOAxNI/V6Wo7r5gqiqtxmgTlQ1qbqQcjLKYeSHPTsEmvlJUDg/EuL0uHQ==
 
+ts-essentials@^9.0.0:
+  version "9.1.2"
+  resolved "https://registry.yarnpkg.com/ts-essentials/-/ts-essentials-9.1.2.tgz#46db6944b73b4cd603f3d959ef1123c16ba56f59"
+  integrity sha512-EaSmXsAhEiirrTY1Oaa7TSpei9dzuCuFPmjKRJRPamERYtfaGS8/KpOSbjergLz/Y76/aZlV9i/krgzsuWEBbg==
+
 ts-jest@^27.0.0:
   version "27.1.2"
   resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-27.1.2.tgz#5991d6eb3fd8e1a8d4b8f6de3ec0a3cc567f3151"