Back out "Back out D16434402, D16434634"

Summary: Reverting the revert and fixing the snapshot tests

Reviewed By: JoshuaGross

Differential Revision: D16467242

fbshipit-source-id: 23ed4122da226ea815d3766098da4400e7ad9442

packages/react-native-codegen/src/generators/components/JavaHelpers.js

@@ -16,11 +16,17 @@ function upperCaseFirst(inString: string): string {
   return inString[0].toUpperCase() + inString.slice(1);
 }
 
-function toSafeJavaString(input: string): string {
-  return input
-    .split('-')
-    .map(upperCaseFirst)
-    .join('');
+function toSafeJavaString(
+  input: string,
+  shouldUpperCaseFirst?: boolean,
+): string {
+  const parts = input.split('-');
+
+  if (shouldUpperCaseFirst === false) {
+    return parts.join('');
+  }
+
+  return parts.map(upperCaseFirst).join('');
 }
 
 function getImports(component: ComponentShape): Set<string> {