remove let

Author: renanmav

src/TypeScriptGenerator.ts

@@ -48,13 +48,10 @@ const MODULE_IMPORT_FIELD = "MODULE_IMPORT_FIELD";
 const DIRECTIVE_NAME = "raw_response_type";
 
 export const generate: TypeGenerator["generate"] = (schema, node, options) => {
-  let ast: ts.Statement[] = IRVisitor.visit(
-    node,
-    createVisitor(schema, options)
+  const ast: ts.Statement[] = aggregateRuntimeImports(
+    IRVisitor.visit(node, createVisitor(schema, options))
   );
 
-  ast = aggregateRuntimeImports(ast);
-
   const printer = ts.createPrinter({ newLine: ts.NewLineKind.LineFeed });
 
   const resultFile = ts.createSourceFile(