From 025899cc562ae06cef30fcecf87cb972add58ea3 Mon Sep 17 00:00:00 2001
From: Nicholas Cunningham <ndcunningham@gmail.com>
Date: Fri, 1 Sep 2023 11:43:13 -0600
Subject: [PATCH] fix(nextjs): Ensure build-custom-server is only added once to
 nx.json

closes: #18957
---
 .../generators/custom-server/custom-server.ts | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/packages/next/src/generators/custom-server/custom-server.ts b/packages/next/src/generators/custom-server/custom-server.ts
index aa1fc1f3e7175..8f6e8ae3f9b23 100644
--- a/packages/next/src/generators/custom-server/custom-server.ts
+++ b/packages/next/src/generators/custom-server/custom-server.ts
@@ -3,7 +3,6 @@ import {
   updateJson,
   convertNxGenerator,
   generateFiles,
-  joinPathFragments,
   logger,
   offsetFromRoot,
   readProjectConfiguration,
@@ -100,12 +99,18 @@ export async function customServerGenerator(
   updateProjectConfiguration(host, options.project, project);
 
   updateJson(host, 'nx.json', (json) => {
-    json.tasksRunnerOptions ??= {};
-    json.tasksRunnerOptions.default ??= { options: {} };
-    json.tasksRunnerOptions.default.options.cacheableOperations = [
-      ...json.tasksRunnerOptions.default.options.cacheableOperations,
-      'build-custom-server',
-    ];
+    if (
+      !json.tasksRunnerOptions?.default?.options?.cacheableOperations?.includes(
+        'build-custom-server'
+      )
+    ) {
+      json.tasksRunnerOptions ??= {};
+      json.tasksRunnerOptions.default ??= { options: {} };
+      json.tasksRunnerOptions.default.options.cacheableOperations = [
+        ...json.tasksRunnerOptions.default.options.cacheableOperations,
+        'build-custom-server',
+      ];
+    }
     return json;
   });
 }