From 35c566f1f513304f20bcbfa1c2157adaa30b8fa9 Mon Sep 17 00:00:00 2001
From: Bogdan Savluk <savluk.bogdan@gmail.com>
Date: Sun, 7 Jun 2020 17:52:03 +0200
Subject: [PATCH] fix build config to work the same when running on windows

---
 babel.config.js                       | 18 +++++++++++++-----
 scripts/rollup-plugin-babel-source.js | 27 ++++++++++++++++++---------
 2 files changed, 31 insertions(+), 14 deletions(-)

diff --git a/babel.config.js b/babel.config.js
index 538d4c8b28fc..2e97375ae55b 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -1,5 +1,11 @@
 "use strict";
 
+const path = require("path");
+
+function normalize(src) {
+  return src.replace(/\//, path.sep);
+}
+
 module.exports = function (api) {
   const env = api.env();
 
@@ -93,7 +99,9 @@ module.exports = function (api) {
       "packages/*/test/fixtures",
       ignoreLib ? "packages/*/lib" : null,
       "packages/babel-standalone/babel.js",
-    ].filter(Boolean),
+    ]
+      .filter(Boolean)
+      .map(normalize),
     presets: [["@babel/env", envOpts]],
     plugins: [
       // TODO: Use @babel/preset-flow when
@@ -115,14 +123,14 @@ module.exports = function (api) {
         test: [
           "packages/babel-parser",
           "packages/babel-helper-validator-identifier",
-        ],
+        ].map(normalize),
         plugins: [
           "babel-plugin-transform-charcodes",
           ["@babel/transform-for-of", { assumeArray: true }],
         ],
       },
       {
-        test: ["./packages/babel-cli", "./packages/babel-core"],
+        test: ["./packages/babel-cli", "./packages/babel-core"].map(normalize),
         plugins: [
           // Explicitly use the lazy version of CommonJS modules.
           convertESM
@@ -131,11 +139,11 @@ module.exports = function (api) {
         ].filter(Boolean),
       },
       {
-        test: "./packages/babel-polyfill",
+        test: normalize("./packages/babel-polyfill"),
         presets: [["@babel/env", envOptsNoTargets]],
       },
       {
-        test: unambiguousSources,
+        test: unambiguousSources.map(normalize),
         sourceType: "unambiguous",
       },
       includeRegeneratorRuntime && {
diff --git a/scripts/rollup-plugin-babel-source.js b/scripts/rollup-plugin-babel-source.js
index 98e470705d2b..8527b10dff94 100644
--- a/scripts/rollup-plugin-babel-source.js
+++ b/scripts/rollup-plugin-babel-source.js
@@ -2,11 +2,16 @@ const path = require("path");
 const fs = require("fs");
 const dirname = path.join(__dirname, "..");
 
+const BABEL_SRC_REGEXP =
+  path.sep === "/"
+    ? /packages\/(babel-[^/]+)\/src\//
+    : /packages\\(babel-[^\\]+)\\src\\/;
+
 module.exports = function () {
   return {
     name: "babel-source",
     load(id) {
-      const matches = id.match(/packages\/(babel-[^/]+)\/src\//);
+      const matches = id.match(BABEL_SRC_REGEXP);
       if (matches) {
         // check if browser field exists for this file and replace
         const packageFolder = path.join(dirname, "packages", matches[1]);
@@ -16,18 +21,20 @@ module.exports = function () {
           packageJson["browser"] &&
           typeof packageJson["browser"] === "object"
         ) {
-          for (let nodeFile in packageJson["browser"]) {
+          for (const nodeFile in packageJson["browser"]) {
             const browserFile = packageJson["browser"][nodeFile].replace(
               /^(\.\/)?lib\//,
               "src/"
             );
-            nodeFile = nodeFile.replace(/^(\.\/)?lib\//, "src/");
-            if (id.endsWith(nodeFile)) {
+            const nodeFileSrc = path.normalize(
+              nodeFile.replace(/^(\.\/)?lib\//, "src/")
+            );
+            if (id.endsWith(nodeFileSrc)) {
               if (browserFile === false) {
                 return "";
               }
               return fs.readFileSync(
-                path.join(packageFolder, browserFile),
+                path.join(packageFolder, path.normalize(browserFile)),
                 "UTF-8"
               );
             }
@@ -74,10 +81,12 @@ module.exports = function () {
           ? packageJson["browser"]
           : packageJson["main"];
 
-      return path.join(
-        packageFolder,
-        // replace lib with src in the package.json entry
-        filename.replace(/^(\.\/)?lib\//, "src/")
+      return path.normalize(
+        path.join(
+          packageFolder,
+          // replace lib with src in the package.json entry
+          filename.replace(/^(\.\/)?lib\//, "src/")
+        )
       );
     },
   };