fix: Run postinstall for the project itself when there is a script defined (#13917) (CP: 23.1)

flow-server/src/main/java/com/vaadin/flow/server/frontend/TaskRunNpmInstall.java

@@ -415,26 +415,21 @@ private void runNpmInstall() throws ExecutionFailedException {
         }
 
         List<String> postinstallPackages = new ArrayList<>();
+        postinstallPackages.add(".");
         postinstallPackages.add("esbuild");
         postinstallPackages.add("@vaadin/vaadin-usage-statistics");
         postinstallPackages.addAll(additionalPostinstallPackages);
 
         for (String postinstallPackage : postinstallPackages) {
-            if (postinstallPackage.trim().equals("")) {
+            File packageJsonFile = getPackageJsonForModule(postinstallPackage);
+            if (packageJsonFile == null || !packageJsonFile.exists()) {
                 continue;
             }
+            File packageFolder = packageJsonFile.getParentFile();
 
-            // Execute "npm run postinstall" in the desired folders in
-            // node_modules
-            File packageFolder = new File(packageUpdater.nodeModulesFolder,
-                    postinstallPackage);
-            if (!packageFolder.exists()) {
-                continue;
-            }
             try {
                 JsonObject packageJson = TaskGeneratePackageJson
-                        .getJsonFileContent(
-                                new File(packageFolder, "package.json"));
+                        .getJsonFileContent(packageJsonFile);
                 if (!containsPostinstallScript(packageJson)) {
                     logger.debug(
                             "Skipping postinstall for '{}' as no postinstall script was found in the package.json",
@@ -468,6 +463,20 @@ private void runNpmInstall() throws ExecutionFailedException {
 
     }
 
+    private File getPackageJsonForModule(String module) {
+        if (module.trim().equals("")) {
+            return null;
+        }
+        if (module.equals(".")) {
+            // The location of the project package.json
+            return new File(packageUpdater.npmFolder, "package.json");
+        }
+
+        return new File(new File(packageUpdater.nodeModulesFolder, module),
+                "package.json");
+
+    }
+
     private boolean containsPostinstallScript(JsonObject packageJson) {
         return packageJson != null && packageJson.hasKey("scripts")
                 && packageJson.getObject("scripts").hasKey("postinstall");

flow-tests/test-frontend/vite-basics/package.json

@@ -1,6 +1,9 @@
 {
   "name": "no-name",
   "license": "UNLICENSED",
+  "scripts": {
+    "postinstall": "node -e \"fs.writeFileSync('target/classes/main.postinstall', 'hello')\""
+  },
   "dependencies": {
     "@polymer/polymer": "3.4.1",
     "@testscope/all": "../vite-test-assets/packages/@testscope/all",

flow-tests/test-frontend/vite-basics/src/test/java/com/vaadin/viteapp/PostinstallIT.java

@@ -0,0 +1,19 @@
+package com.vaadin.viteapp;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+import org.apache.commons.io.IOUtils;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class PostinstallIT extends ViteDevModeIT {
+
+    @Test
+    public void postinstallRanForProject() throws IOException {
+        waitForDevServer(); // This is what runs the postinstall script
+        Assert.assertEquals("hello", IOUtils.toString(
+                getClass().getClassLoader().getResource("main.postinstall"),
+                StandardCharsets.UTF_8));
+    }
+}