From b6a3f83f22ae33b93532e8361b9171ae24c5e239 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=B2=20Ribaudo?= <nicolo.ribaudo@gmail.com>
Date: Wed, 23 Jun 2021 02:43:08 +0200
Subject: [PATCH] Fix `@babel/runtime` build on Windows

---
 .../babel-plugin-transform-runtime/scripts/build-dist.js   | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/packages/babel-plugin-transform-runtime/scripts/build-dist.js b/packages/babel-plugin-transform-runtime/scripts/build-dist.js
index db052f50012d..df6c0c96c1a1 100644
--- a/packages/babel-plugin-transform-runtime/scripts/build-dist.js
+++ b/packages/babel-plugin-transform-runtime/scripts/build-dist.js
@@ -127,7 +127,7 @@ function writeHelperFile(
     buildHelper(runtimeName, pkgDirname, fullPath, helperName, { esm, corejs })
   );
 
-  return `./${filePath}`;
+  return esm ? `./helpers/esm/${fileName}` : `./helpers/${fileName}`;
 }
 
 function writeHelpers(runtimeName, { corejs } = {}) {
@@ -164,12 +164,13 @@ function writeHelpers(runtimeName, { corejs } = {}) {
     // - Node.js <13.2.0 will fail resolving the first array entry, and will
     //   fallback to the second entry (the CJS file)
     // In Babel 8 we can simplify this.
-    helperSubExports[`./${helperPath}`] = [
+    helperSubExports[`./${path.posix.join("helpers", helperName)}`] = [
       { node: cjs, import: esm, default: cjs },
       cjs,
     ];
     // For backward compatibility. We can remove this in Babel 8.
-    helperSubExports[`./${path.join("helpers", "esm", helperName)}`] = esm;
+    helperSubExports[`./${path.posix.join("helpers", "esm", helperName)}`] =
+      esm;
   }
 
   writeHelperExports(runtimeName, helperSubExports);