Inline the last duplicate Platform.select key

packages/metro-transform-plugins/src/__tests__/inline-plugin-test.js

@@ -399,6 +399,17 @@ describe('inline constants', () => {
     });
   });
 
+  test('uses the last definition when Platform.select has duplicate keys', () => {
+    const code = `
+      var value = Platform.select({ios: 1, ios: 2});
+    `;
+
+    compare([inlinePlugin], code, 'var value = 2;', {
+      inlinePlatform: true,
+      platform: 'ios',
+    });
+  });
+
   test('inlines Platform.select in the code when using an ObjectMethod', () => {
     const code = `
       function a() {

packages/metro-transform-plugins/src/inline-plugin.js

@@ -90,9 +90,9 @@ export default function inlinePlugin(
     key: string,
     fallback: () => Node,
   ): Node {
-    let value = null;
-
-    for (const p of objectExpression.properties) {
+    // Object literal evaluation keeps the last definition of a duplicate key.
+    for (let i = objectExpression.properties.length - 1; i >= 0; i--) {
+      const p = objectExpression.properties[i];
       if (!isObjectProperty(p) && !isObjectMethod(p)) {
         continue;
       }
@@ -101,16 +101,14 @@ export default function inlinePlugin(
         (isStringLiteral(p.key) && p.key.value === key)
       ) {
         if (isObjectProperty(p)) {
-          value = p.value;
-          break;
+          return p.value;
         } else if (isObjectMethod(p)) {
-          value = t.toExpression(p);
-          break;
+          return t.toExpression(p);
         }
       }
     }
 
-    return value ?? fallback();
+    return fallback();
   }
 
   function hasStaticProperties(objectExpression: ObjectExpression): boolean {