chore: add tests

src/csv-loader/loader.ts

@@ -230,9 +230,13 @@ function schemaToTypeString(schema: Schema, resourceNames?: Map<string, string>)
       return 'number';
     case 'boolean':
       return 'boolean';
+    case 'stringLiteral':
+      return `"${schema.value}"`;
+    case 'union':
+      return schema.members.map(m => schemaToTypeString(m, resourceNames)).join(' | ');
     case 'reference': {
       // Use the resource name mapping if provided, otherwise capitalize table name
-      const typeName = resourceNames?.get(schema.tableName) || 
+      const typeName = resourceNames?.get(schema.tableName) ||
         schema.tableName.charAt(0).toUpperCase() + schema.tableName.slice(1);
       return schema.isArray ? `readonly ${typeName}[]` : typeName;
     }
@@ -244,7 +248,12 @@ function schemaToTypeString(schema: Schema, resourceNames?: Map<string, string>)
         });
         return `readonly [${tupleElements.join(', ')}]`;
       }
-      return `readonly ${schemaToTypeString(schema.element, resourceNames)}[]`;
+      // Wrap union types in parentheses to maintain correct precedence
+      const elementType = schemaToTypeString(schema.element, resourceNames);
+      if (schema.element.type === 'union') {
+        return `readonly (${elementType})[]`;
+      }
+      return `readonly ${elementType}[]`;
     case 'tuple':
       const tupleElements = schema.elements.map((el) => {
         const typeStr = schemaToTypeString(el.schema, resourceNames);