fix: consider extralight fonts in RCTGetFontWeight

Author: vonovak

packages/react-native/React/Views/RCTFont.mm

@@ -24,6 +24,7 @@ RCTFontWeight RCTGetFontWeight(UIFont *font)
     weightSuffixes = @[
       @"normal",
       @"ultralight",
+      @"extralight",
       @"thin",
       @"light",
       @"regular",
@@ -39,6 +40,7 @@ RCTFontWeight RCTGetFontWeight(UIFont *font)
     fontWeights = @[
       @(UIFontWeightRegular),
       @(UIFontWeightUltraLight),
+      @(UIFontWeightUltraLight),
       @(UIFontWeightThin),
       @(UIFontWeightLight),
       @(UIFontWeightRegular),

packages/rn-tester/RNTesterUnitTests/RCTFontTests.m

@@ -49,6 +49,25 @@ - (void)testWeight
   }
 }
 
+- (void)testWeightFromFontName
+{
+  // "ExtraLight" and "UltraLight" name the same weight (OpenType usWeightClass 200).
+  {
+    UIFont *font = [UIFont fontWithName:@"HelveticaNeue-UltraLight" size:14];
+    XCTAssertEqual(RCTGetFontWeight(font), UIFontWeightUltraLight);
+  }
+#if !TARGET_OS_TV
+  {
+    UIFont *font = [UIFont fontWithName:@"Seravek-ExtraLight" size:14];
+    XCTAssertEqual(RCTGetFontWeight(font), UIFontWeightUltraLight);
+  }
+  {
+    UIFont *font = [UIFont fontWithName:@"Seravek-Light" size:14];
+    XCTAssertEqual(RCTGetFontWeight(font), UIFontWeightLight);
+  }
+#endif
+}
+
 - (void)testSize
 {
   {