Don't add params of anonymous exported function decls to the outer scope (#9613)

* Don't add params of anonymous exported function decls to the outer scope

* Test

packages/babel-helper-split-export-declaration/src/index.js

@@ -49,10 +49,7 @@ export default function splitExportDeclaration(exportDeclaration) {
     exportDeclaration.replaceWith(updatedDeclaration);
 
     if (needBindingRegistration) {
-      scope.registerBinding(
+      scope.registerDeclaration(exportDeclaration);
-        isClassDeclaration ? "let" : "var",
-        exportDeclaration,
-      );
     }
 
     return exportDeclaration;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/regression/issue-9611/input.mjs

@@ -0,0 +1,3 @@
+import x from './x';
+
+export default function(x) {}

packages/babel-plugin-transform-modules-commonjs/test/fixtures/regression/issue-9611/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-modules-commonjs"]
+}

packages/babel-plugin-transform-modules-commonjs/test/fixtures/regression/issue-9611/output.js

@@ -0,0 +1,12 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = _default;
+
+var _x = _interopRequireDefault(require("./x"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _default(x) {}

packages/babel-traverse/src/scope/index.js

@@ -518,7 +518,7 @@ export default class Scope {
     }
 
     const parent = this.getProgramParent();
-    const ids = path.getBindingIdentifiers(true);
+    const ids = path.getOuterBindingIdentifiers(true);
 
     for (const name of Object.keys(ids)) {
       for (const id of (ids[name]: Array<Object>)) {