diff --git a/build.mjs b/build.mjs
index 7fbd85e..348c1fe 100644
--- a/build.mjs
+++ b/build.mjs
@@ -37,7 +37,7 @@ await measure(`package.json → ./dist/package.json`, `created in`, async () =>
     maintainers: Existing.maintainers,
     license: Existing.license,
     publishConfig: Existing.publishConfig,
-    export: Existing.export,
+    exports: Existing.exports,
     main: Existing.main,
     module: Existing.module,
     typings: Existing.typings,
diff --git a/validate_dist.mjs b/validate_dist.mjs
index f7d3144..bcbf56c 100644
--- a/validate_dist.mjs
+++ b/validate_dist.mjs
@@ -14,3 +14,25 @@ console.log();
 try {
   const publintResult = await $`pnpm publint ${pkgDir}`;
 } catch (error) {}
+
+// Guard against regressions in dist/package.json generation (see build.mjs):
+// a missing `exports` field makes bundlers resolve the CJS build, which breaks
+// the `@effector/reflect/scope` subpath and causes a dual-package hazard with
+// effector-react (scope is lost inside `variant`/`reflect`).
+{
+  const distPkg = JSON.parse(
+    await fs.readFile(resolve(pkgDir, 'package.json'), { encoding: 'utf-8' }),
+  );
+  const missing = [];
+  if (!distPkg.exports) missing.push('exports');
+  else {
+    if (!distPkg.exports['.']) missing.push("exports['.']");
+    if (!distPkg.exports['./scope']) missing.push("exports['./scope']");
+  }
+  if (missing.length > 0) {
+    throw new Error(
+      `dist/package.json is missing required field(s): ${missing.join(', ')}`,
+    );
+  }
+  console.log('✓ dist/package.json has valid "exports"');
+}