Added support to customizable the projectFileExtensions.

flow-plugins/flow-gradle-plugin/src/main/kotlin/com/vaadin/gradle/VaadinFlowPluginExtension.kt

@@ -278,6 +278,13 @@ public abstract class VaadinFlowPluginExtension @Inject constructor(private val
 
     public abstract val cleanFrontendFiles: Property<Boolean>
 
+    /**
+     * The list of extra file extensions that are considered project files.
+     * Hashes are calculated for these files as part of detecting if a new prod
+     * bundle should be generated.
+     */
+    public abstract val extraProjectFileExtensions: ListProperty<String>
+
     public fun filterClasspath(@DelegatesTo(value = ClasspathFilter::class, strategy = Closure.DELEGATE_FIRST) block: Closure<*>) {
         block.delegate = classpathFilter
         block.resolveStrategy = Closure.DELEGATE_FIRST
@@ -427,6 +434,10 @@ public class PluginEffectiveConfiguration(
 
     public val cleanFrontendFiles: Property<Boolean> = extension.cleanFrontendFiles
             .convention(true)
+
+    public val extraProjectFileExtensions: ListProperty<String> = extension.extraProjectFileExtensions
+            .convention(emptyList())
+
     /**
      * Finds the value of a boolean property. It searches in gradle and system properties.
      *
@@ -476,6 +487,7 @@ public class PluginEffectiveConfiguration(
             "frontendHotdeploy=${frontendHotdeploy.get()}," +
             "reactEnable=${reactEnable.get()}," +
             "cleanFrontendFiles=${cleanFrontendFiles.get()}" +
+            "extraProjectFileExtensions=${extraProjectFileExtensions.get()}" +
             ")"
     public companion object {
         public fun get(project: Project): PluginEffectiveConfiguration =

flow-plugins/flow-maven-plugin/src/main/java/com/vaadin/flow/plugin/maven/FlowModeAbstractMojo.java

@@ -25,6 +25,7 @@
 import java.net.URISyntaxException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 import java.util.function.Function;
@@ -232,6 +233,9 @@ public abstract class FlowModeAbstractMojo extends AbstractMojo
     @Parameter(property = InitParameters.REACT_ENABLE, defaultValue = "${null}")
     private Boolean reactEnable;
 
+    @Parameter(defaultValue = "${null}")
+    private List<String> extraProjectFileExtensions;
+
     /**
      * Generates a List of ClasspathElements (Run and CompileTime) from a
      * MavenProject.
@@ -522,4 +526,14 @@ public boolean isReactEnabled() {
         File frontendDirectory = BuildFrontendUtil.getFrontendDirectory(this);
         return FrontendUtils.isReactRouterRequired(frontendDirectory);
     }
+
+    @Override
+    public List<String> extraProjectFileExtensions() {
+        if (extraProjectFileExtensions != null) {
+            return extraProjectFileExtensions;
+        }
+
+        return Collections.emptyList();
+    }
+
 }

flow-plugins/flow-plugin-base/src/main/java/com/vaadin/flow/plugin/base/BuildFrontendUtil.java

@@ -163,7 +163,9 @@ public static void prepareFrontend(PluginAdapterBase adapter)
                 .setNodeAutoUpdate(adapter.nodeAutoUpdate())
                 .withHomeNodeExecRequired(adapter.requireHomeNodeExec())
                 .setJavaResourceFolder(adapter.javaResourceFolder())
-                .withProductionMode(false).withReact(adapter.isReactEnabled());
+                .withProductionMode(false).withReact(adapter.isReactEnabled())
+                .withExtraProjectFileExtensions(
+                        adapter.extraProjectFileExtensions());
 
         // Copy jar artifact contents in TaskCopyFrontendFiles
         options.copyResources(adapter.getJarFiles());
@@ -403,7 +405,9 @@ public static void runDevBuildNodeUpdater(PluginAdapterBuild adapter)
                     .withBundleBuild(true)
                     .skipDevBundleBuild(adapter.skipDevBundleBuild())
                     .withCompressBundle(adapter.compressBundle())
-                    .withReact(adapter.isReactEnabled());
+                    .withReact(adapter.isReactEnabled())
+                    .withExtraProjectFileExtensions(
+                            adapter.extraProjectFileExtensions());
             new NodeTasks(options).execute();
         } catch (ExecutionFailedException exception) {
             throw exception;

flow-plugins/flow-plugin-base/src/main/java/com/vaadin/flow/plugin/base/PluginAdapterBase.java

@@ -326,4 +326,11 @@ default Lookup createLookup(ClassFinder classFinder) {
      *         router and excluding React dependencies
      */
     boolean isReactEnabled();
+
+    /**
+     * Get the list of project file extensions.
+     *
+     * @return list of project file extensions
+     */
+    List<String> extraProjectFileExtensions();
 }

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

@@ -82,6 +82,8 @@ public class Options implements Serializable {
 
     private boolean compressBundle = true;
 
+    private List<String> extraProjectFileExtensions = null;
+
     /**
      * The node.js version to be used when node.js is installed automatically by
      * Vaadin, for example <code>"v16.0.0"</code>. Defaults to
@@ -954,4 +956,26 @@ public Options withCleanOldGeneratedFiles(boolean clean) {
     public boolean isCleanOldGeneratedFiles() {
         return cleanOldGeneratedFiles;
     }
+
+    /**
+     * Sets the extra project file extensions.
+     *
+     * @param extraProjectFileExtensions
+     *            the project file extensions
+     * @return this builder
+     */
+    public Options withExtraProjectFileExtensions(
+            List<String> extraProjectFileExtensions) {
+        this.extraProjectFileExtensions = extraProjectFileExtensions;
+        return this;
+    }
+
+    /**
+     * Gets the project file extensions.
+     *
+     * @return the project file extensions
+     */
+    public List<String> getExtraProjectFileExtensions() {
+        return extraProjectFileExtensions;
+    }
 }

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

@@ -22,10 +22,14 @@
 import java.io.UncheckedIOException;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
+import java.util.Collections;
+import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
+import org.atmosphere.util.StringEscapeUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -127,7 +131,17 @@ private void createGeneratedConfig() throws IOException {
                 .replace("#webComponentTags#",
                         webComponentTags == null || webComponentTags.isEmpty()
                                 ? ""
-                                : String.join(";", webComponentTags));
+                                : String.join(";", webComponentTags))
+                .replace("#extraProjectFileExtensions#", Optional
+                        .ofNullable(options.getExtraProjectFileExtensions())
+                        .orElse(Collections.emptyList()).stream().map(ext -> {
+                            try {
+                                return "'" + StringEscapeUtils.escapeJava(ext)
+                                        + "'";
+                            } catch (Exception e) {
+                                throw new RuntimeException(e);
+                            }
+                        }).collect(Collectors.joining(", ")));
         template = updateFileSystemRouterVitePlugin(template);
 
         FileIOUtils.writeIfChanged(generatedConfigFile, template);

flow-server/src/main/resources/vite.generated.ts

@@ -298,7 +298,7 @@ function statsExtracterPlugin(): PluginOption {
 
       const frontendFiles: Record<string, string> = {};
 
-      const projectFileExtensions = ['.js', '.js.map', '.ts', '.ts.map', '.tsx', '.tsx.map', '.css', '.css.map'];
+      const projectFileExtensions = ['.js', '.js.map', '.ts', '.ts.map', '.tsx', '.tsx.map', '.css', '.css.map'#extraProjectFileExtensions#];
 
       const isThemeComponentsResource = (id: string) =>
           id.startsWith(themeOptions.frontendGeneratedFolder.replace(/\\/g, '/'))