Add package-local server ESM import rewrite script

Author: Ri0n72Y

packages/server/scripts/rewrite-esm-imports.js

@@ -0,0 +1,44 @@
+/**
+ * Post-build script: rewrites extensionless relative imports in the server
+ * package's dist/ output to include explicit ".js" extensions.
+ *
+ * Keep this package-local so the server feature does not change the existing
+ * root-level core rewrite script.
+ */
+import { existsSync, readFileSync, writeFileSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import { globSync } from "glob";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const packageRoot = join(__dirname, "..");
+const distDir = join(packageRoot, "dist");
+
+if (!existsSync(distDir)) {
+  throw new Error(`Cannot rewrite server ESM imports because dist directory does not exist: ${distDir}`);
+}
+
+const files = globSync("**/*.js", { cwd: distDir, absolute: true });
+
+// Match: from "./anything" or from "../anything"
+// Negative lookahead: skip if already ends with .js, .json, .node, or is a bare specifier
+const IMPORT_RE = /(from\s+["'])(\.\.?\/[^"']+?)(?<!\.[a-zA-Z0-9]{1,4})(["'])/g;
+
+let totalRewrites = 0;
+
+for (const filePath of files) {
+  const original = readFileSync(filePath, "utf8");
+  let rewrites = 0;
+
+  const updated = original.replace(IMPORT_RE, (_match, prefix, specifier, quote) => {
+    rewrites++;
+    return `${prefix}${specifier}.js${quote}`;
+  });
+
+  if (rewrites > 0) {
+    writeFileSync(filePath, updated, "utf8");
+    totalRewrites += rewrites;
+  }
+}
+
+console.log(`\n✅  Rewrote ${totalRewrites} imports across ${files.length} files in server/dist/\n`);