Add initial files

types/env.d.ts

@@ -0,0 +1,25 @@
+/// <reference types="vite/client" />
+
+/**
+ * Describes all existing environment variables and their types.
+ * Required for Code completion/intellisense and type checking.
+ *
+ * Note: To prevent accidentally leaking env variables to the client, only variables prefixed with `VITE_` are exposed to your Vite-processed code.
+ *
+ * @see https://github.com/vitejs/vite/blob/0a699856b248116632c1ac18515c0a5c7cf3d1db/packages/vite/types/importMeta.d.ts#L7-L14 Base Interface.
+ * @see https://vitejs.dev/guide/env-and-mode.html#env-files Vite Env Variables Doc.
+ */
+interface ImportMetaEnv {
+  /**
+   * URL where `renderer` web page is running.
+   * This variable is initialized in scripts/watch.ts
+   */
+  readonly VITE_DEV_SERVER_URL: undefined | string;
+
+  /** Current app version */
+  readonly VITE_APP_VERSION: string;
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv;
+}