ci: package publish ready

scripts/check-package.mjs

@@ -0,0 +1,41 @@
+import { existsSync, readFileSync } from "node:fs";
+
+const requiredFiles = [
+  "README.md",
+  "dist/index.js",
+  "dist/index.d.ts",
+];
+
+const missingFiles = requiredFiles.filter((path) => !existsSync(path));
+
+if (missingFiles.length > 0) {
+  console.error(`Missing package artifact(s): ${missingFiles.join(", ")}`);
+  process.exit(1);
+}
+
+const packageJson = JSON.parse(readFileSync("package.json", "utf8"));
+
+const expectedFields = {
+  main: "dist/index.js",
+  module: "dist/index.js",
+  types: "dist/index.d.ts",
+};
+
+for (const [field, expected] of Object.entries(expectedFields)) {
+  if (packageJson[field] !== expected) {
+    console.error(`package.json ${field} must be ${expected}`);
+    process.exit(1);
+  }
+}
+
+if (packageJson.exports?.["."]?.types !== "./dist/index.d.ts") {
+  console.error("package.json exports[\".\"].types must point to ./dist/index.d.ts");
+  process.exit(1);
+}
+
+if (packageJson.exports?.["."]?.import !== "./dist/index.js") {
+  console.error("package.json exports[\".\"].import must point to ./dist/index.js");
+  process.exit(1);
+}
+
+console.log("Package metadata and artifacts are publish-ready.");