fix: ignore if passed an empty i18n instance

Author: felixmosh

__tests__/server-hmr.spec.js

@@ -453,5 +453,15 @@ describe('server-hmr', () => {
 
       expect(getter).toHaveBeenCalledWith({ changedFiles });
     });
+
+    it('should not fail when getter returns a none i18next instance', () => {
+      const update = { lang: 'en', ns: 'name-space' };
+
+      const getter = jest.fn().mockImplementation(() => null);
+      const changedFiles = [`${update.lang}/${update.ns}`];
+      applyServerHMR(getter);
+
+      expect(() => whenNativeHMRTriggeredWith(changedFiles)).not.toThrow();
+    });
   });
 });

lib/server-hmr.js

@@ -12,6 +12,10 @@ module.exports = function applyServerHMR(i18nOrGetter) {
     const i18nInstance =
       typeof i18nOrGetter === 'function' ? i18nOrGetter({ changedFiles }) : i18nOrGetter;
 
+    if (!i18nInstance) {
+      return;
+    }
+
     const list = extractList(changedFiles, i18nInstance);
 
     if (list.length === 0) {