From 741d35db1ec9e558fa42d3f56d1a211f3dda60f2 Mon Sep 17 00:00:00 2001
From: vcoppe <vianney.coppe@gmail.com>
Date: Sun, 18 Oct 2026 16:53:39 +0200
Subject: [PATCH] sparse desktop build

---
 tauri/tauri.conf.json       |  2 +-
 website/package.json        |  1 +
 website/src/hooks.server.js |  7 +++++-
 website/svelte.config.js    |  7 +++++-
 website/vite.config.ts      | 45 +++++++++++++++++++++++++++++++++++--
 5 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/tauri/tauri.conf.json b/tauri/tauri.conf.json
index c644349aa..95424c8d4 100644
--- a/tauri/tauri.conf.json
+++ b/tauri/tauri.conf.json
@@ -6,7 +6,7 @@
     "build": {
         "beforeDevCommand": "npm --prefix ../website run dev -- --port 4283",
         "devUrl": "http://localhost:4283",
-        "beforeBuildCommand": "BASE_PATH='' npm --prefix ../website run build",
+        "beforeBuildCommand": "npm --prefix ../website run build:desktop",
         "frontendDist": "../website/build"
     },
     "app": {
diff --git a/website/package.json b/website/package.json
index f4a51d1e3..2415d3ca0 100644
--- a/website/package.json
+++ b/website/package.json
@@ -5,6 +5,7 @@
     "scripts": {
         "dev": "vite dev",
         "build": "vite build",
+        "build:desktop": "BUILD_TARGET=desktop BASE_PATH='' vite build",
         "prebuild": "npx tsx src/lib/scripts/pwa-manifest.ts",
         "postbuild": "npx tsx src/lib/scripts/sitemap.ts",
         "preview": "vite preview",
diff --git a/website/src/hooks.server.js b/website/src/hooks.server.js
index 7441e52c7..fbf839d5a 100644
--- a/website/src/hooks.server.js
+++ b/website/src/hooks.server.js
@@ -46,8 +46,13 @@ export async function handle({ event, resolve }) {
     <meta name="twitter:url" content="https://gpx.studio/" />
     <meta name="twitter:site" content="@gpxstudio" />
     <meta name="twitter:creator" content="@gpxstudio" />
-    <link rel="alternate" hreflang="x-default" href="https://gpx.studio${getURLForLanguage('en', path)}" />
+    <link rel="alternate" hreflang="x-default" href="https://gpx.studio${getURLForLanguage('en', path)}" />`;
+
+    // the manifests are made for the website, not for the desktop app (`npm run build:desktop`)
+    if (process.env.BUILD_TARGET !== 'desktop') {
+        headTag += `
     <link rel="manifest" href="/${language}.manifest.webmanifest" />`;
+    }
 
     if (page !== '404') {
         for (let lang of Object.keys(languages)) {
diff --git a/website/svelte.config.js b/website/svelte.config.js
index 07e954378..3ea6526b2 100644
--- a/website/svelte.config.js
+++ b/website/svelte.config.js
@@ -7,6 +7,9 @@ const mdsvexOptions = {
     extensions: ['.mdx'],
 };
 
+/** Whether the website is built for the desktop app (`npm run build:desktop`), which only has the app. */
+const desktop = process.env.BUILD_TARGET === 'desktop';
+
 /** @type {import('@sveltejs/kit').Config} */
 const config = {
     extensions: ['.svelte', ...mdsvexOptions.extensions],
@@ -23,7 +26,9 @@ const config = {
             relative: false,
         },
         prerender: {
-            crawl: true,
+            // the desktop app only has the pages of the app, the others are left empty (vite.config.ts)
+            crawl: !desktop,
+            handleUnseenRoutes: desktop ? 'ignore' : 'fail',
         },
     },
 };
diff --git a/website/vite.config.ts b/website/vite.config.ts
index 05677b2bd..0fdebafa5 100644
--- a/website/vite.config.ts
+++ b/website/vite.config.ts
@@ -1,9 +1,50 @@
 import { sveltekit } from '@sveltejs/kit/vite';
 import { enhancedImages } from '@sveltejs/enhanced-img';
-import { defineConfig } from 'vite';
+import { defineConfig, type Plugin } from 'vite';
 import tailwindcss from '@tailwindcss/vite';
 import wasm from 'vite-plugin-wasm';
 
+/** Whether the website is built for the desktop app (`npm run build:desktop`), which only has the app. */
+const desktop = process.env.BUILD_TARGET === 'desktop';
+
+/** The pages of the website, which the desktop app opens on gpx.studio: home, help and embed. */
+const websitePage = /\/src\/routes\/\[\[language\]\]\/(\+page\.|help\/|embed\/)/;
+
+/** The help guides, which the server imports too (for the titles of the pages). */
+const guide = /\/src\/lib\/docs\/.*\.mdx$/;
+
+/**
+ * For the desktop app, empties the pages of the website, the help guides and the WebAssembly engine
+ * (the app has its own), so that their code, images and the module are not in the build.
+ */
+function desktopBuild(): Plugin {
+    return {
+        name: 'desktop-build',
+        enforce: 'pre',
+        load(id) {
+            const path = id.split('?')[0];
+            if (websitePage.test(path)) {
+                // no entries: the page is not prerendered
+                return path.endsWith('.server.ts') ? 'export const entries = () => [];' : '';
+            }
+            if (guide.test(path)) {
+                return "---\ntitle: ''\n---\n";
+            }
+            if (path.endsWith('/src/lib/engine/backend/wasm.ts')) {
+                return `export async function createWasmBackend() {
+                    throw new Error('The desktop app has no WebAssembly engine');
+                }`;
+            }
+        },
+    };
+}
+
 export default defineConfig({
-    plugins: [enhancedImages(), tailwindcss(), wasm(), sveltekit()],
+    plugins: [
+        ...(desktop ? [desktopBuild()] : []),
+        enhancedImages(),
+        tailwindcss(),
+        wasm(),
+        sveltekit(),
+    ],
 });