build: Refine server build steps

server/build.js

@@ -0,0 +1,42 @@
+const fs = require('fs');
+const path = require('path');
+// eslint-disable-next-line import/no-extraneous-dependencies
+const ignore = require('ignore');
+
+const OUT_DIR = 'dist';
+
+const ig = ignore();
+if (fs.existsSync('.buildignore')) {
+  const patterns = fs.readFileSync('.buildignore', 'utf8');
+  ig.add(patterns);
+}
+
+if (fs.existsSync(OUT_DIR)) {
+  fs.rmSync(OUT_DIR, { recursive: true, force: true });
+}
+
+fs.mkdirSync(OUT_DIR, { recursive: true });
+
+const build = (src, dest) => {
+  const dirents = fs.readdirSync(src, { withFileTypes: true });
+
+  // eslint-disable-next-line no-restricted-syntax
+  for (const dirent of dirents) {
+    const srcPath = path.join(src, dirent.name);
+
+    if (ig.ignores(srcPath)) {
+      continue; // eslint-disable-line no-continue
+    }
+
+    const destPath = path.join(dest, dirent.name);
+
+    if (dirent.isDirectory()) {
+      fs.mkdirSync(destPath, { recursive: true });
+      build(srcPath, destPath);
+    } else {
+      fs.copyFileSync(srcPath, destPath);
+    }
+  }
+};
+
+build('./', OUT_DIR);