refactor: avoid readonly in nested types

src/csv-loader/loader.ts

@@ -510,29 +510,29 @@ function schemaToTypeString(schema: Schema, resourceNames?: Map<string, string>)
     case 'reference': {
       const typeName = resourceNames?.get(schema.tableName) ||
         schema.tableName.charAt(0).toUpperCase() + schema.tableName.slice(1);
-      const baseType = schema.isArray ? `readonly ${typeName}[]` : typeName;
+      const baseType = schema.isArray ? `${typeName}[]` : typeName;
       return schema.isOptional ? `${baseType} | null` : baseType;
     }
     case 'array':
       if (schema.element.type === 'tuple') {
         const tupleElements = schema.element.elements.map((el) => {
           const typeStr = schemaToTypeString(el.schema, resourceNames);
-          return el.name ? `readonly ${el.name}: ${typeStr}` : typeStr;
+          return el.name ? `${el.name}: ${typeStr}` : typeStr;
         });
-        return `readonly [${tupleElements.join(', ')}]`;
+        return `[${tupleElements.join(', ')}]`;
       }
       // Wrap union types in parentheses to maintain correct precedence
       const elementType = schemaToTypeString(schema.element, resourceNames);
       if (schema.element.type === 'union') {
-        return `readonly (${elementType})[]`;
+        return `(${elementType})[]`;
       }
-      return `readonly ${elementType}[]`;
+      return `${elementType}[]`;
     case 'tuple':
       const tupleElements = schema.elements.map((el) => {
         const typeStr = schemaToTypeString(el.schema, resourceNames);
-        return el.name ? `readonly ${el.name}: ${typeStr}` : typeStr;
+        return el.name ? `${el.name}: ${typeStr}` : typeStr;
       });
-      return `readonly [${tupleElements.join(', ')}]`;
+      return `[${tupleElements.join(', ')}]`;
     default:
       return 'unknown';
   }