Don't resolve shadowed arguments variables from functions

packages/babel-plugin-transform-arrow-functions/test/fixtures/arrow-functions/arguments-global-var/output.js

@@ -1,7 +1,9 @@
-var _arguments2 = 1;
+var _arguments2 = typeof arguments === "undefined" ? void 0 : arguments;
+
+var arguments = 1;
 
 function fn() {
-  var _arguments = _arguments2;
+  var _arguments = arguments;
 
   var foo = function () {
     return _arguments;

packages/babel-plugin-transform-arrow-functions/test/fixtures/arrow-functions/arguments/output.js

@@ -1,3 +1,5 @@
+var _arguments6 = typeof arguments === "undefined" ? void 0 : arguments;
+
 function one() {
   var _arguments = arguments;
 
@@ -83,26 +85,27 @@ function six(obj) {
 six();
 
 var seven = function () {
-  var _arguments6 = 1;
+  var arguments = 1;
   return _arguments6;
 };
 
 seven();
 
 var eight = function () {
-  var _arguments7 = 1;
+  var arguments = 1;
   return function () {
-    return _arguments7;
+    return _arguments6;
   };
 };
 
 eight();
 
 function nine() {
-  var _arguments8 = 1;
+  var _arguments7 = arguments;
+  var arguments = 1;
 
   var foo = function () {
-    return _arguments8;
+    return _arguments7;
   };
 }
 
@@ -111,9 +114,9 @@ nine();
 var eleven = function () {
   var arguments = 2;
   return function () {
-    var _arguments9 = arguments;
+    var _arguments8 = arguments;
     return function () {
-      return _arguments9;
+      return _arguments8;
     };
   };
 };
@@ -124,9 +127,9 @@ var twelve = function () {
   var arguments = 2;
   return class {
     m() {
-      var _arguments10 = arguments;
+      var _arguments9 = arguments;
       return function () {
-        return _arguments10;
+        return _arguments9;
       };
     }
 

packages/babel-traverse/src/path/conversion.ts

@@ -635,7 +635,7 @@ const getScopeInformationVisitor = mergeVisitors<{
 
       let curr = child.scope;
       do {
-        if (curr.hasOwnBinding("arguments")) {
+        if (curr.hasOwnBinding("arguments") && !curr.hasBinding("arguments")) {
           curr.rename("arguments");
           return;
         }

packages/babel-traverse/test/fixtures/conversion/implicit-var-arguments/exec.js

@@ -0,0 +1,11 @@
+var arguments = [1, 2, 3];
+var arr = () => arguments[0];
+
+arr(); // 1
+
+function foo(n) {
+var f = () => arguments[0] + n; // foo's implicit arguments binding. arguments[0] is n
+return f();
+}
+
+expect(foo(3)).toStrictEqual(6)

packages/babel-traverse/test/fixtures/conversion/implicit-var-arguments/input.js

@@ -0,0 +1,10 @@
+var arguments = [1, 2, 3];
+var arr = () => arguments[0];
+
+arr(); // 1
+
+function foo(n) {
+var f = () => arguments[0] + n; // foo's implicit arguments binding. arguments[0] is n
+return f();
+}
+

packages/babel-traverse/test/fixtures/conversion/implicit-var-arguments/options.json

@@ -0,0 +1,4 @@
+{
+  "sourceType": "unambiguous",
+  "presets": ["env"]
+}

packages/babel-traverse/test/fixtures/conversion/implicit-var-arguments/output.js

@@ -0,0 +1,20 @@
+var _arguments = typeof arguments === "undefined" ? void 0 : arguments;
+
+var arguments = [1, 2, 3];
+
+var arr = function arr() {
+  return _arguments[0];
+};
+
+arr(); // 1
+
+function foo(n) {
+  var _arguments2 = arguments;
+
+  var f = function f() {
+    return _arguments2[0] + n;
+  }; // foo's implicit arguments binding. arguments[0] is n
+
+
+  return f();
+}