feat: emit fetch client in nextjs template

Author: mnahkies

packages/openapi-code-generator/src/typescript/typescript-nextjs/typescript-nextjs.generator.ts

@@ -32,6 +32,7 @@ import {
   requestBodyAsParameter,
   statusStringToType,
 } from "../common/typescript-common"
+import {TypescriptFetchClientBuilder} from "../typescript-fetch/typescript-fetch-client-builder"
 
 function reduceParamsToOpenApiSchema(parameters: IRParameter[]): IRModelObject {
   return parameters.reduce(
@@ -446,7 +447,7 @@ export async function generateTypescriptNextJS(
 
   const project = new Project()
 
-  const routers = (
+  const serverRouters = (
     await Promise.all(
       input.groupedOperations("route").map(async (group) => {
         const filename = path.join(
@@ -504,10 +505,30 @@ export async function generateTypescriptNextJS(
     )
   ).flat()
 
+  const clientOutputPath = [generatedDirectory, "clients", "client.ts"].join(
+    path.sep,
+  )
+  const clientImportBuilder = new ImportBuilder({filename: clientOutputPath})
+
+  const fetchClientBuilder = new TypescriptFetchClientBuilder(
+    clientOutputPath,
+    "ApiClient",
+    input,
+    clientImportBuilder,
+    rootTypeBuilder.withImports(clientImportBuilder),
+    rootSchemaBuilder.withImports(clientImportBuilder),
+    {
+      enableRuntimeResponseValidation: config.enableRuntimeResponseValidation,
+    },
+  )
+
+  input.allOperations().map((it) => fetchClientBuilder.add(it))
+
   await emitGenerationResult(
     config.dest,
     [
-      ...routers,
+      ...serverRouters,
+      fetchClientBuilder.toCompilationUnit(),
       rootTypeBuilder.toCompilationUnit(),
       rootSchemaBuilder.toCompilationUnit(),
     ],