diff --git a/packages/rn/src/client.ts b/packages/rn/src/client.ts
index 064a05b..b4319e4 100644
--- a/packages/rn/src/client.ts
+++ b/packages/rn/src/client.ts
@@ -61,6 +61,7 @@ export class LogtoClient extends StandardLogtoClient {
             case 'sign-out': {
               break;
             }
+            // eslint-disable-next-line @typescript-eslint/switch-exhaustiveness-check -- just in case
             default: {
               throw new LogtoNativeClientError('navigation_purpose_not_supported');
             }
diff --git a/packages/rn/src/polyfill.ts b/packages/rn/src/polyfill.ts
index 6b6f229..0f56b7f 100644
--- a/packages/rn/src/polyfill.ts
+++ b/packages/rn/src/polyfill.ts
@@ -7,11 +7,7 @@
 /* eslint-disable @silverhand/fp/no-mutation, @typescript-eslint/no-unnecessary-condition */
 import { btoaPolyfill, atobPolyfill } from 'js-base64';
 
-if (!global.btoa) {
-  global.btoa = btoaPolyfill;
-}
+global.btoa ||= btoaPolyfill;
 
-if (!global.atob) {
-  global.atob = atobPolyfill;
-}
+global.atob ||= atobPolyfill;
 /* eslint-enable @silverhand/fp/no-mutation, @typescript-eslint/no-unnecessary-condition */