diff --git a/modules/openapi-generator/src/main/resources/typescript-angular/package.mustache b/modules/openapi-generator/src/main/resources/typescript-angular/package.mustache
index a55fa3c3f5de..4eb48018bbae 100644
--- a/modules/openapi-generator/src/main/resources/typescript-angular/package.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-angular/package.mustache
@@ -13,6 +13,7 @@
   ],
   "license": "{{licenseName}}",
   "scripts": {
+    "prepare": "npm run build",
     "build": "ng-packagr -p ng-package.json"
   },
   "peerDependencies": {
diff --git a/samples/client/petstore/typescript-angular-v12-provided-in-root/builds/with-npm/package.json b/samples/client/petstore/typescript-angular-v12-provided-in-root/builds/with-npm/package.json
index f5fffd2a55fe..e2851267a47d 100644
--- a/samples/client/petstore/typescript-angular-v12-provided-in-root/builds/with-npm/package.json
+++ b/samples/client/petstore/typescript-angular-v12-provided-in-root/builds/with-npm/package.json
@@ -13,6 +13,7 @@
   ],
   "license": "Unlicense",
   "scripts": {
+    "prepare": "npm run build",
     "build": "ng-packagr -p ng-package.json"
   },
   "peerDependencies": {
diff --git a/samples/client/petstore/typescript-angular-v13-provided-in-root/builds/with-npm/package.json b/samples/client/petstore/typescript-angular-v13-provided-in-root/builds/with-npm/package.json
index 7c3b658c06f2..9095d33c61e8 100644
--- a/samples/client/petstore/typescript-angular-v13-provided-in-root/builds/with-npm/package.json
+++ b/samples/client/petstore/typescript-angular-v13-provided-in-root/builds/with-npm/package.json
@@ -13,6 +13,7 @@
   ],
   "license": "Unlicense",
   "scripts": {
+    "prepare": "npm run build",
     "build": "ng-packagr -p ng-package.json"
   },
   "peerDependencies": {
diff --git a/samples/client/petstore/typescript-angular-v19-with-angular-dependency-params/builds/default/package.json b/samples/client/petstore/typescript-angular-v19-with-angular-dependency-params/builds/default/package.json
index 958b69fd631f..f3556859d47b 100644
--- a/samples/client/petstore/typescript-angular-v19-with-angular-dependency-params/builds/default/package.json
+++ b/samples/client/petstore/typescript-angular-v19-with-angular-dependency-params/builds/default/package.json
@@ -13,6 +13,7 @@
   ],
   "license": "Unlicense",
   "scripts": {
+    "prepare": "npm run build",
     "build": "ng-packagr -p ng-package.json"
   },
   "peerDependencies": {
diff --git a/samples/client/petstore/typescript-angular-v19/builds/deep-object/package.json b/samples/client/petstore/typescript-angular-v19/builds/deep-object/package.json
index 71f619b0dead..b59e5d443084 100644
--- a/samples/client/petstore/typescript-angular-v19/builds/deep-object/package.json
+++ b/samples/client/petstore/typescript-angular-v19/builds/deep-object/package.json
@@ -13,6 +13,7 @@
   ],
   "license": "Unlicense",
   "scripts": {
+    "prepare": "npm run build",
     "build": "ng-packagr -p ng-package.json"
   },
   "peerDependencies": {
diff --git a/samples/client/petstore/typescript-angular-v19/builds/default/package.json b/samples/client/petstore/typescript-angular-v19/builds/default/package.json
index 24645d6e839c..4b03cb4d0f82 100644
--- a/samples/client/petstore/typescript-angular-v19/builds/default/package.json
+++ b/samples/client/petstore/typescript-angular-v19/builds/default/package.json
@@ -13,6 +13,7 @@
   ],
   "license": "Unlicense",
   "scripts": {
+    "prepare": "npm run build",
     "build": "ng-packagr -p ng-package.json"
   },
   "peerDependencies": {
diff --git a/samples/client/petstore/typescript-angular-v20/builds/default/package.json b/samples/client/petstore/typescript-angular-v20/builds/default/package.json
index 6e3130abc485..ba2967e936ec 100644
--- a/samples/client/petstore/typescript-angular-v20/builds/default/package.json
+++ b/samples/client/petstore/typescript-angular-v20/builds/default/package.json
@@ -13,6 +13,7 @@
   ],
   "license": "Unlicense",
   "scripts": {
+    "prepare": "npm run build",
     "build": "ng-packagr -p ng-package.json"
   },
   "peerDependencies": {