i18n typecheck

i18next.d.ts

@@ -0,0 +1,18 @@
+// import the original type declarations
+import "i18next";
+// import all namespaces (for the default language, only)
+import common from "./src/locales/languages/en-US.json";
+
+declare module "i18next" {
+  // Extend CustomTypeOptions
+  // eslint-disable-next-line @typescript-eslint/naming-convention
+  interface CustomTypeOptions {
+    // custom namespace type, if you changed it
+    defaultNS: "common";
+    // custom resources type
+    resources: {
+      common: typeof common;
+    };
+    // other
+  }
+}