fix: tsconfigをViteの推奨する設定に合わせる (#2162)

src/store/vuex.ts

@@ -35,20 +35,18 @@ export class Store<
 > extends BaseStore<S> {
   constructor(options: StoreOptions<S, G, A, M>) {
     super(options as OriginalStoreOptions<S>);
-    // @ts-expect-error Storeの型を書き換えている影響で未初期化として判定される
     this.actions = dotNotationDispatchProxy(this.dispatch.bind(this));
     this.mutations = dotNotationCommitProxy(
-      // @ts-expect-error Storeの型を書き換えている影響で未初期化として判定される
       this.commit.bind(this) as Commit<M>,
     );
   }
 
-  readonly getters!: G;
+  declare readonly getters: G;
 
   // @ts-expect-error Storeの型を非互換な型で書き換えているためエラー
-  dispatch: Dispatch<A>;
+  declare dispatch: Dispatch<A>;
   // @ts-expect-error Storeの型を非互換な型で書き換えているためエラー
-  commit: Commit<M>;
+  declare commit: Commit<M>;
   /**
    * ドット記法用のActionを直接呼べる。エラーになる場合はdispatchを使う。
    * 詳細 https://github.com/VOICEVOX/voicevox/issues/2088

tsconfig.json

@@ -1,22 +1,24 @@
 {
   "compilerOptions": {
-    "target": "ES6",
+    "target": "esnext",
     "module": "esnext",
     "strict": true,
     "jsx": "preserve",
+    "jsxImportSource": "vue",
     "importHelpers": true,
     "moduleResolution": "bundler",
     "skipLibCheck": true,
     "esModuleInterop": true,
     "allowSyntheticDefaultImports": true,
+    "isolatedModules": true,
     "resolveJsonModule": true,
     "sourceMap": true,
     "baseUrl": ".",
     "types": ["vitest/globals"],
     "paths": {
       "@/*": ["src/*"]
     },
-    "lib": ["esnext", "dom", "dom.iterable", "scripthost"]
+    "lib": ["esnext", "dom", "dom.iterable"]
   },
   "include": [
     "src/**/*.ts",