react-native-reanimated: Requiring unknown module "undefined" ( isNativeModule Function )

i have this error as well - even though the PropsAllowlist seems to be clearly defined, it would crash every time. I ended up moving the contents of that file (propsAllowLists.ts) directly into the index.ts file, and that worked for some reason. Created a patch to work around it for now

i have this error as well - even though the PropsAllowlist seems to be clearly defined, it would crash every time. I ended up moving the contents of that file (propsAllowLists.ts) directly into the index.ts file, and that worked for some reason. Created a patch to work around it for now

Can you share the patch file, please?

Hope this helps

diff --git a/node_modules/react-native-reanimated/src/reanimated2/js-reanimated/index.ts b/node_modules/react-native-reanimated/src/reanimated2/js-reanimated/index.ts
index 1e89ea1..557b19f 100644
--- a/node_modules/react-native-reanimated/src/reanimated2/js-reanimated/index.ts
+++ b/node_modules/react-native-reanimated/src/reanimated2/js-reanimated/index.ts
@@ -3,7 +3,132 @@ import JSReanimated from './JSReanimated';
 import type { StyleProps } from '../commonTypes';
 import type { AnimatedStyle } from '../helperTypes';
 import { isWeb } from '../PlatformChecker';
-import { PropsAllowlists } from '../../propsAllowlists';
+
+type AllowlistsHolder = {
+  UI_THREAD_PROPS_WHITELIST: Record<string, boolean>;
+  NATIVE_THREAD_PROPS_WHITELIST: Record<string, boolean>;
+};
+
+const PropsAllowlists: AllowlistsHolder = {
+  /**
+   * Styles allowed to be direcly updated in UI thread
+   */
+  UI_THREAD_PROPS_WHITELIST: {
+    opacity: true,
+    transform: true,
+    /* colors */
+    backgroundColor: true,
+    borderRightColor: true,
+    borderBottomColor: true,
+    borderColor: true,
+    borderEndColor: true,
+    borderLeftColor: true,
+    borderStartColor: true,
+    borderTopColor: true,
+    /* ios styles */
+    shadowOpacity: true,
+    shadowRadius: true,
+    /* legacy android transform properties */
+    scaleX: true,
+    scaleY: true,
+    translateX: true,
+    translateY: true,
+  },
+  /**
+   * Whitelist of view props that can be updated in native thread via UIManagerModule
+   */
+  NATIVE_THREAD_PROPS_WHITELIST: {
+    borderBottomWidth: true,
+    borderEndWidth: true,
+    borderLeftWidth: true,
+    borderRightWidth: true,
+    borderStartWidth: true,
+    borderTopWidth: true,
+    borderWidth: true,
+    bottom: true,
+    flex: true,
+    flexGrow: true,
+    flexShrink: true,
+    height: true,
+    left: true,
+    margin: true,
+    marginBottom: true,
+    marginEnd: true,
+    marginHorizontal: true,
+    marginLeft: true,
+    marginRight: true,
+    marginStart: true,
+    marginTop: true,
+    marginVertical: true,
+    maxHeight: true,
+    maxWidth: true,
+    minHeight: true,
+    minWidth: true,
+    padding: true,
+    paddingBottom: true,
+    paddingEnd: true,
+    paddingHorizontal: true,
+    paddingLeft: true,
+    paddingRight: true,
+    paddingStart: true,
+    paddingTop: true,
+    paddingVertical: true,
+    right: true,
+    start: true,
+    top: true,
+    width: true,
+    zIndex: true,
+    borderBottomEndRadius: true,
+    borderBottomLeftRadius: true,
+    borderBottomRightRadius: true,
+    borderBottomStartRadius: true,
+    borderRadius: true,
+    borderTopEndRadius: true,
+    borderTopLeftRadius: true,
+    borderTopRightRadius: true,
+    borderTopStartRadius: true,
+    elevation: true,
+    fontSize: true,
+    lineHeight: true,
+    textShadowRadius: true,
+    textShadowOffset: true,
+    letterSpacing: true,
+    aspectRatio: true,
+    columnGap: true, // iOS only
+    end: true, // number or string
+    flexBasis: true, // number or string
+    gap: true,
+    rowGap: true,
+    /* strings */
+    display: true,
+    backfaceVisibility: true,
+    overflow: true,
+    resizeMode: true,
+    fontStyle: true,
+    fontWeight: true,
+    textAlign: true,
+    textDecorationLine: true,
+    fontFamily: true,
+    textAlignVertical: true,
+    fontVariant: true,
+    textDecorationStyle: true,
+    textTransform: true,
+    writingDirection: true,
+    alignContent: true,
+    alignItems: true,
+    alignSelf: true,
+    direction: true, // iOS only
+    flexDirection: true,
+    flexWrap: true,
+    justifyContent: true,
+    position: true,
+    /* text color */
+    color: true,
+    tintColor: true,
+    shadowColor: true,
+    placeholderTextColor: true,
+  },
+};
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 let createReactDOMStyle: (style: any) => any;

Our project is also seeing this issue, SaatwikRishi temporary fix worked for us, but we also found this… What we did note is we don’t see this error when the debugger is disabled. Appears something in relation to the debugger and this module in RNreanimated was causing this error because its trying to automatically call Flipper which we don’t have installed and for some reason I do not understand yet this interacts with isNativeProp in isNativeModuleFunction. Adding to react-native.config dependencies: { …(process.env.NO_FLIPPER // When set, skip flipper includes for iOS archive builds (release buidls) ? { ‘react-native-flipper’: { platforms: { ios: null } } } : {}), }, seems to have solved this issue. Note sure it will solve your error but thought I’d share. There may be something going on with RNreanimated and the debugger.