diff --git a/packages/react-native-web/src/exports/I18nManager/__tests__/index-test.js b/packages/react-native-web/src/exports/I18nManager/__tests__/index-test.js
index d4a84392..8873e8f1 100644
--- a/packages/react-native-web/src/exports/I18nManager/__tests__/index-test.js
+++ b/packages/react-native-web/src/exports/I18nManager/__tests__/index-test.js
@@ -12,7 +12,7 @@ describe('apis/I18nManager', () => {
 
     describe('isRTL', () => {
       test('is false', () => {
-        expect(I18nManager.isRTL).toBe(false);
+        expect(I18nManager.getConstants().isRTL).toBe(false);
         expect(getDocumentDir()).toEqual('ltr');
       });
     });
@@ -24,12 +24,12 @@ describe('apis/I18nManager', () => {
 
       test('when set to false, "isRTL" is false', () => {
         I18nManager.forceRTL(false);
-        expect(I18nManager.isRTL).toBe(false);
+        expect(I18nManager.getConstants().isRTL).toBe(false);
         expect(getDocumentDir()).toEqual('ltr');
       });
       test('when set to true, "isRTL" is true', () => {
         I18nManager.forceRTL(true);
-        expect(I18nManager.isRTL).toBe(true);
+        expect(I18nManager.getConstants().isRTL).toBe(true);
         expect(getDocumentDir()).toEqual('rtl');
       });
     });
@@ -41,11 +41,11 @@ describe('apis/I18nManager', () => {
 
       test('when set to false, "doLeftAndRightSwapInRTL" is false', () => {
         I18nManager.swapLeftAndRightInRTL(false);
-        expect(I18nManager.doLeftAndRightSwapInRTL).toBe(false);
+        expect(I18nManager.getConstants().doLeftAndRightSwapInRTL).toBe(false);
       });
       test('when set to true, "doLeftAndRightSwapInRTL" is true', () => {
         I18nManager.swapLeftAndRightInRTL(true);
-        expect(I18nManager.doLeftAndRightSwapInRTL).toBe(true);
+        expect(I18nManager.getConstants().doLeftAndRightSwapInRTL).toBe(true);
       });
     });
   });
@@ -61,7 +61,7 @@ describe('apis/I18nManager', () => {
 
     describe('isRTL', () => {
       test('is true', () => {
-        expect(I18nManager.isRTL).toBe(true);
+        expect(I18nManager.getConstants().isRTL).toBe(true);
         expect(getDocumentDir()).toEqual('rtl');
       });
     });
@@ -73,12 +73,12 @@ describe('apis/I18nManager', () => {
 
       test('when set to false, "isRTL" is false', () => {
         I18nManager.allowRTL(false);
-        expect(I18nManager.isRTL).toBe(false);
+        expect(I18nManager.getConstants().isRTL).toBe(false);
         expect(getDocumentDir()).toEqual('ltr');
       });
       test('when set to true, "isRTL" is true', () => {
         I18nManager.allowRTL(true);
-        expect(I18nManager.isRTL).toBe(true);
+        expect(I18nManager.getConstants().isRTL).toBe(true);
         expect(getDocumentDir()).toEqual('rtl');
       });
     });
@@ -90,12 +90,12 @@ describe('apis/I18nManager', () => {
 
       test('when set to false, "isRTL" is true', () => {
         I18nManager.forceRTL(false);
-        expect(I18nManager.isRTL).toBe(true);
+        expect(I18nManager.getConstants().isRTL).toBe(true);
         expect(getDocumentDir()).toEqual('rtl');
       });
       test('when set to true, "isRTL" is true', () => {
         I18nManager.forceRTL(true);
-        expect(I18nManager.isRTL).toBe(true);
+        expect(I18nManager.getConstants().isRTL).toBe(true);
         expect(getDocumentDir()).toEqual('rtl');
       });
     });
@@ -107,11 +107,11 @@ describe('apis/I18nManager', () => {
 
       test('when set to false, "doLeftAndRightSwapInRTL" is false', () => {
         I18nManager.swapLeftAndRightInRTL(false);
-        expect(I18nManager.doLeftAndRightSwapInRTL).toBe(false);
+        expect(I18nManager.getConstants().doLeftAndRightSwapInRTL).toBe(false);
       });
       test('when set to true, "doLeftAndRightSwapInRTL" is true', () => {
         I18nManager.swapLeftAndRightInRTL(true);
-        expect(I18nManager.doLeftAndRightSwapInRTL).toBe(true);
+        expect(I18nManager.getConstants().doLeftAndRightSwapInRTL).toBe(true);
       });
     });
   });
diff --git a/packages/react-native-web/src/exports/I18nManager/index.js b/packages/react-native-web/src/exports/I18nManager/index.js
index 419f4173..e8b53a75 100644
--- a/packages/react-native-web/src/exports/I18nManager/index.js
+++ b/packages/react-native-web/src/exports/I18nManager/index.js
@@ -12,13 +12,17 @@ import ExecutionEnvironment from 'fbjs/lib/ExecutionEnvironment';
 
 type I18nManagerStatus = {
   allowRTL: (allowRTL: boolean) => void,
-  doLeftAndRightSwapInRTL: boolean,
   forceRTL: (forceRTL: boolean) => void,
-  isRTL: boolean,
+  getConstants: () => Constants,
   setPreferredLanguageRTL: (setRTL: boolean) => void,
   swapLeftAndRightInRTL: (flipStyles: boolean) => void
 };
 
+type Constants = {
+  doLeftAndRightSwapInRTL: boolean,
+  isRTL: boolean
+};
+
 let doLeftAndRightSwapInRTL = true;
 let isPreferredLanguageRTL = false;
 let isRTLAllowed = true;
@@ -48,18 +52,15 @@ const I18nManager: I18nManagerStatus = {
     isRTLForced = bool;
     onDirectionChange();
   },
+  getConstants(): Constants {
+    return { doLeftAndRightSwapInRTL, isRTL: isRTL() };
+  },
   setPreferredLanguageRTL(bool) {
     isPreferredLanguageRTL = bool;
     onDirectionChange();
   },
   swapLeftAndRightInRTL(bool) {
     doLeftAndRightSwapInRTL = bool;
-  },
-  get doLeftAndRightSwapInRTL() {
-    return doLeftAndRightSwapInRTL;
-  },
-  get isRTL() {
-    return isRTL();
   }
 };
 
diff --git a/packages/react-native-web/src/exports/StyleSheet/createStyleResolver.js b/packages/react-native-web/src/exports/StyleSheet/createStyleResolver.js
index 060d90ae..5d2f6986 100644
--- a/packages/react-native-web/src/exports/StyleSheet/createStyleResolver.js
+++ b/packages/react-native-web/src/exports/StyleSheet/createStyleResolver.js
@@ -54,7 +54,7 @@ export default function createStyleResolver() {
   }
 
   function _injectRegisteredStyle(id) {
-    const { doLeftAndRightSwapInRTL, isRTL } = I18nManager;
+    const { doLeftAndRightSwapInRTL, isRTL } = I18nManager.getConstants();
     const dir = isRTL ? (doLeftAndRightSwapInRTL ? 'rtl' : 'rtlNoSwap') : 'ltr';
     if (!inserted[dir][id]) {
       const style = createCompileableStyle(i18nStyle(flattenStyle(id)));
@@ -145,7 +145,7 @@ export default function createStyleResolver() {
    * Resolves a React Native style object
    */
   function _resolveStyle(style, key) {
-    const { doLeftAndRightSwapInRTL, isRTL } = I18nManager;
+    const { doLeftAndRightSwapInRTL, isRTL } = I18nManager.getConstants();
     const dir = isRTL ? (doLeftAndRightSwapInRTL ? 'rtl' : 'rtlNoSwap') : 'ltr';
 
     // faster: memoized
diff --git a/packages/react-native-web/src/exports/StyleSheet/i18nStyle.js b/packages/react-native-web/src/exports/StyleSheet/i18nStyle.js
index 1c0ae377..9c9c2da5 100644
--- a/packages/react-native-web/src/exports/StyleSheet/i18nStyle.js
+++ b/packages/react-native-web/src/exports/StyleSheet/i18nStyle.js
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @noflow
+ * @flow
  */
 
 import I18nManager from '../I18nManager';
@@ -78,8 +78,8 @@ const PROPERTIES_VALUE = {
 // Invert the sign of a numeric-like value
 const additiveInverse = (value: String | Number) => multiplyStyleLengthValue(value, -1);
 
-const i18nStyle = originalStyle => {
-  const { doLeftAndRightSwapInRTL, isRTL } = I18nManager;
+const i18nStyle = (originalStyle: Object) => {
+  const { doLeftAndRightSwapInRTL, isRTL } = I18nManager.getConstants();
   const style = originalStyle || emptyObject;
   const frozenProps = {};
   const nextStyle = {};
@@ -97,7 +97,7 @@ const i18nStyle = originalStyle => {
       // convert start/end
       const convertedProp = PROPERTIES_I18N[originalProp];
       prop = isRTL ? PROPERTIES_FLIP[convertedProp] : convertedProp;
-    } else if (isRTL && doLeftAndRightSwapInRTL && PROPERTIES_FLIP[originalProp]) {
+    } else if (isRTL && doLeftAndRightSwapInRTL && (PROPERTIES_FLIP[originalProp]: any)) {
       prop = PROPERTIES_FLIP[originalProp];
     }
 
@@ -123,15 +123,19 @@ const i18nStyle = originalStyle => {
         // convert start/end
         const convertedValue = PROPERTIES_I18N[originalValue];
         value = isRTL ? PROPERTIES_FLIP[convertedValue] : convertedValue;
-      } else if (isRTL && doLeftAndRightSwapInRTL && PROPERTIES_FLIP[originalValue]) {
-        value = PROPERTIES_FLIP[originalValue];
+      } else if (isRTL && doLeftAndRightSwapInRTL) {
+        const flippedValue = PROPERTIES_FLIP[(originalValue: any)];
+        if (flippedValue != null) {
+          value = flippedValue;
+        }
       }
     }
 
     // Create finalized style
     if (isRTL && prop === 'textShadowOffset') {
+      const invertedValue = additiveInverse((value: any).width);
+      (value: any).width = invertedValue;
       nextStyle[prop] = value;
-      nextStyle[prop].width = additiveInverse(value.width);
     } else if (!frozenProps[prop]) {
       nextStyle[prop] = value;
     }