TS2Swift: skip enum types when emitting string literal unions

Author: kateinoigakukun

Plugins/BridgeJS/Sources/TS2Swift/JavaScript/src/processor.js

@@ -324,6 +324,11 @@ export class TypeProcessor {
      */
     getStringLiteralUnionLiterals(type) {
         if ((type.flags & ts.TypeFlags.Union) === 0) return null;
+        const symbol = type.getSymbol() ?? type.aliasSymbol;
+        // Skip enums so we don't double-generate real enum declarations.
+        if (symbol && (symbol.flags & ts.SymbolFlags.Enum) !== 0) {
+            return null;
+        }
         /** @type {ts.UnionType} */
         // @ts-ignore
         const unionType = type;

Plugins/BridgeJS/Sources/TS2Swift/JavaScript/test/__snapshots__/ts2swift.test.js.snap

@@ -355,12 +355,6 @@ extension FeatureFlag: _BridgedSwiftEnumNoPayload, _BridgedSwiftRawValueEnum {}
 
 @JSFunction func takesFeatureFlag(_ flag: FeatureFlag) throws(JSException) -> Void
 
-enum FeatureFlag: String {
-    case foo = "foo"
-    case bar = "bar"
-}
-extension FeatureFlag: _BridgedSwiftEnumNoPayload, _BridgedSwiftRawValueEnum {}
-
 @JSFunction func returnsFeatureFlag() throws(JSException) -> FeatureFlag
 "
 `;