Perf: Add v3DocCache to generateApi

Author: d-mon-

packages/rtk-query-codegen-openapi/src/generate.ts

@@ -20,9 +20,10 @@ import { capitalize, getOperationDefinitions, getV3Doc, removeUndefined, isQuery
 import { factory } from './utils/factory';
 
 const generatedApiName = 'injectedRtkApi';
+const v3DocCache: Record<string, OpenAPIV3.Document> = {};
 
 function defaultIsDataResponse(code: string) {
-  if (code === "default") {
+  if (code === 'default') {
     return true;
   }
   const parsedCode = Number(code);
@@ -98,7 +99,7 @@ export async function generateApi(
     httpResolverOptions,
   }: GenerationOptions
 ) {
-  const v3Doc = await getV3Doc(spec, httpResolverOptions);
+  const v3Doc = (v3DocCache[spec] ??= await getV3Doc(spec, httpResolverOptions));
 
   const apiGen = new ApiGenerator(v3Doc, {
     unionUndefined,