Create svelte project and build it using play for deployment

.gitignore

@@ -43,3 +43,28 @@ mvn_settings.xml
 # Release folder
 releases
 
+# Frontend build assets
+/webservice/public
+
+# Frontend node_modules
+/frontend/node_modules
+
+# Frontend Output
+/frontend/.output
+/frontend/.vercel
+/frontend/.svelte-kit
+/frontend/build
+
+# Frontend OS
+/frontend/.DS_Store
+/frontend/Thumbs.db
+
+# Frontend Env
+/frontend/.env
+/frontend/.env.*
+!/frontend/.env.example
+!/frontend/.env.test
+
+# Frontend Vite
+/frontend/vite.config.js.timestamp-*
+/frontend/vite.config.ts.timestamp-*

build.sbt

@@ -179,6 +179,39 @@ lazy val cloud_gcp = project
     libraryDependencies ++= spark_all
   )
 
+// Webpack integration for frontend
+lazy val buildFrontend = taskKey[Unit]("Build frontend")
+
+lazy val frontend = (project in file("frontend"))
+  .settings(
+    buildFrontend := {
+      println("Installing frontend dependencies...")
+      import scala.sys.process._
+      val npmInstallResult = Process("npm install", file("frontend")).!
+
+      if (npmInstallResult != 0) {
+        sys.error("npm install failed!")
+      }
+
+      println("Building frontend...")
+      val buildResult = Process("npm run build", file("frontend")).!
+
+      if (buildResult == 0) {
+        println("Copying frontend assets to /webservice/public...")
+        val buildDir = file("frontend/build")
+        val publicDir = file("webservice/public")
+
+        // Clean the target directory if needed
+        IO.delete(publicDir)
+
+        // Copy the build files to the public folder
+        IO.copyDirectory(buildDir, publicDir)
+      } else {
+        sys.error("Frontend build failed!")
+      }
+    }
+  )
+
 lazy val webservice = (project in file("webservice"))
   .enablePlugins(PlayScala)
   .settings(
@@ -188,7 +221,10 @@ lazy val webservice = (project in file("webservice"))
     libraryDependencies ++= Seq(
       guice,
       "org.scalatestplus.play" %% "scalatestplus-play" % "5.1.0" % Test
-    )
+    ),
+    // Ensure webservice depends on frontend build
+    Compile / run := ((Compile / run) dependsOn (frontend / buildFrontend)).evaluated,
+    Compile / stage := ((Compile / stage) dependsOn (frontend / buildFrontend)).value
   )
 
 ThisBuild / assemblyMergeStrategy := {

frontend/.npmrc

@@ -0,0 +1 @@
+engine-strict=true

frontend/.prettierignore

@@ -0,0 +1,4 @@
+# Package Managers
+package-lock.json
+pnpm-lock.yaml
+yarn.lock

frontend/.prettierrc

@@ -0,0 +1,8 @@
+{
+	"useTabs": true,
+	"singleQuote": true,
+	"trailingComma": "none",
+	"printWidth": 100,
+	"plugins": ["prettier-plugin-svelte"],
+	"overrides": [{ "files": "*.svelte", "options": { "parser": "svelte" } }]
+}

frontend/README.md

@@ -0,0 +1,38 @@
+# create-svelte
+
+Everything you need to build a Svelte project, powered by [`create-svelte`](https://github.com/sveltejs/kit/tree/main/packages/create-svelte).
+
+## Creating a project
+
+If you're seeing this, you've probably already done this step. Congrats!
+
+```bash
+# create a new project in the current directory
+npm create svelte@latest
+
+# create a new project in my-app
+npm create svelte@latest my-app
+```
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```bash
+npm run dev
+
+# or start the server and open the app in a new browser tab
+npm run dev -- --open
+```
+
+## Building
+
+To create a production version of your app:
+
+```bash
+npm run build
+```
+
+You can preview the production build with `npm run preview`.
+
+> To deploy your app, you may need to install an [adapter](https://kit.svelte.dev/docs/adapters) for your target environment.

frontend/eslint.config.js

@@ -0,0 +1,33 @@
+import js from '@eslint/js';
+import ts from 'typescript-eslint';
+import svelte from 'eslint-plugin-svelte';
+import prettier from 'eslint-config-prettier';
+import globals from 'globals';
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+	js.configs.recommended,
+	...ts.configs.recommended,
+	...svelte.configs['flat/recommended'],
+	prettier,
+	...svelte.configs['flat/prettier'],
+	{
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				...globals.node
+			}
+		}
+	},
+	{
+		files: ['**/*.svelte'],
+		languageOptions: {
+			parserOptions: {
+				parser: ts.parser
+			}
+		}
+	},
+	{
+		ignores: ['build/', '.svelte-kit/', 'dist/']
+	}
+];