Normalize core-js entry points (#9752)

* normalize `core-js` entry points names

* Update packages/babel-preset-env/src/polyfills/corejs3/entry-plugin.js

Co-Authored-By: zloirock <zloirock@zloirock.ru>

* handle windows paths

packages/babel-preset-env/src/polyfills/corejs3/entry-plugin.js

@@ -21,6 +21,12 @@ function isBabelPolyfillSource(source) {
 }
 
 function isCoreJSSource(source) {
+  if (typeof source === "string") {
+    source = source
+      .replace(/\\/g, "/")
+      .replace(/(\/(index)?)?(\.js)?$/i, "")
+      .toLowerCase();
+  }
   return has(corejsEntries, source) && corejsEntries[source];
 }
 

packages/babel-preset-env/test/fixtures/corejs3/entry-normalization/input.mjs

@@ -0,0 +1,7 @@
+import 'core-js/es/map/index.js';
+import 'core-js/es/set/index';
+import 'core-js/es/array/from.js';
+import 'core-js/es/promise/';
+import 'cOrE-jS/eS/SymBOL/iTERator';
+import 'core-js\\es\\symbol\\async-iterator';
+import 'foo/index.js';

packages/babel-preset-env/test/fixtures/corejs3/entry-normalization/options.json

@@ -0,0 +1,12 @@
+{
+  "presets": [
+    [
+      "../../../../lib",
+      {
+        "modules": false,
+        "useBuiltIns": "entry",
+        "corejs": 3
+      }
+    ]
+  ]
+}

packages/babel-preset-env/test/fixtures/corejs3/entry-normalization/output.mjs

@@ -0,0 +1,11 @@
+import "core-js/modules/es.symbol.async-iterator";
+import "core-js/modules/es.symbol.iterator";
+import "core-js/modules/es.array.from";
+import "core-js/modules/es.map";
+import "core-js/modules/es.object.to-string";
+import "core-js/modules/es.promise";
+import "core-js/modules/es.promise.finally";
+import "core-js/modules/es.set";
+import "core-js/modules/es.string.iterator";
+import "core-js/modules/web.dom-collections.iterator";
+import 'foo/index.js';