Add standalone binary build via Node.js SEA

.github/workflows/test.yml

@@ -65,11 +65,17 @@ jobs:
         working-directory: server
         run: npm pack
 
+      - name: Build standalone binary
+        working-directory: server
+        run: npm run build:standalone
+
       - name: Stage server release files
         run: |
           mkdir server-release
           cp server/openmodelica-modelica-language-server-*.tgz server-release/
           cp server/src/tree-sitter-modelica.wasm server-release/
+          cp server/out/modelica-language-server server-release/modelica-language-server-linux-x64
+          cp server/out/web-tree-sitter.wasm server-release/
 
       - name: Archive server release files
         uses: actions/upload-artifact@v7
@@ -107,6 +113,8 @@ jobs:
             modelica-language-server-*.vsix
             server-release/openmodelica-modelica-language-server-*.tgz
             server-release/tree-sitter-modelica.wasm
+            server-release/web-tree-sitter.wasm
+            server-release/modelica-language-server-linux-x64
           fail_on_unmatched_files: true
           generate_release_notes: true
           append_body: true

server/package.json

@@ -29,12 +29,14 @@
   "scripts": {
     "build": "node esbuild.config.js",
     "build:watch": "node esbuild.config.js --watch",
+    "build:standalone": "npm run build && node scripts/build-standalone.js",
     "prepack": "npm run build",
     "prepublishOnly": "npm run build"
   },
   "devDependencies": {
     "@types/node": "^25.9.1",
     "esbuild": "^0.28.0",
+    "postject": "^1.0.0-alpha.6",
     "tsx": "^4.19.0",
     "typescript": "^6.0.0"
   },

server/scripts/build-standalone.js

@@ -0,0 +1,70 @@
+#!/usr/bin/env node
+/**
+ * Build a Node.js Single Executable Application (SEA) for the language server.
+ * Produces out/modelica-language-server[.exe] alongside the existing WASM files.
+ * Requires Node.js >= 20 and postject (dev dependency).
+ *
+ * Usage: node scripts/build-standalone.js
+ */
+
+'use strict';
+
+const { execFileSync, execSync } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+
+const OUT_DIR = path.join(__dirname, '..', 'out');
+const SEA_CONFIG = path.join(__dirname, '..', 'sea-config.json');
+const BLOB = path.join(OUT_DIR, 'sea-prep.blob');
+const IS_WIN = process.platform === 'win32';
+const IS_MAC = process.platform === 'darwin';
+const BINARY_NAME = IS_WIN ? 'modelica-language-server.exe' : 'modelica-language-server';
+const OUT_BINARY = path.join(OUT_DIR, BINARY_NAME);
+const POSTJECT = path.join(__dirname, '..', 'node_modules', '.bin', 'postject');
+
+function run(cmd, args, opts) {
+  console.log(`  $ ${cmd} ${args.join(' ')}`);
+  execFileSync(cmd, args, { stdio: 'inherit', ...opts });
+}
+
+// 1. Generate the SEA preparation blob.
+console.log('\n[1/4] Generating SEA blob...');
+run(process.execPath, ['--experimental-sea-config', SEA_CONFIG]);
+
+// 2. Copy the current node binary as the carrier.
+console.log('\n[2/4] Copying node binary...');
+fs.copyFileSync(process.execPath, OUT_BINARY);
+fs.chmodSync(OUT_BINARY, 0o755);
+
+// 3. Remove existing code signature on macOS (required before injection).
+if (IS_MAC) {
+  console.log('\n[2b] Removing macOS code signature...');
+  run('codesign', ['--remove-signature', OUT_BINARY]);
+}
+
+// 4. Inject the blob.
+console.log('\n[3/4] Injecting SEA blob with postject...');
+const postjectArgs = [
+  OUT_BINARY,
+  'NODE_SEA_BLOB',
+  BLOB,
+  '--sentinel-fuse', 'NODE_SEA_FUSE_fce680ab2cc467b6e072b8b5df1996b2',
+];
+if (IS_MAC) {
+  postjectArgs.push('--macho-segment-name', 'NODE_SEA');
+}
+run(POSTJECT, postjectArgs);
+
+// 4. Re-sign on macOS (ad-hoc, sufficient for local use; CI can use a real identity).
+if (IS_MAC) {
+  console.log('\n[4/4] Ad-hoc re-signing for macOS...');
+  run('codesign', ['--sign', '-', OUT_BINARY]);
+} else {
+  console.log('\n[4/4] Done.');
+}
+
+const size = (fs.statSync(OUT_BINARY).size / 1024 / 1024).toFixed(1);
+console.log(`\nStandalone binary: ${OUT_BINARY}  (${size} MB)`);
+console.log('WASM files must remain alongside the binary:');
+console.log('  tree-sitter-modelica.wasm');
+console.log('  web-tree-sitter.wasm');

server/sea-config.json

@@ -0,0 +1,5 @@
+{
+  "main": "out/server.js",
+  "output": "out/sea-prep.blob",
+  "disableExperimentalSEAWarning": true
+}