Add test of toplevel return in JS script

tests/baselines/reference/plainJSGrammarErrors2.js

@@ -1,22 +1,8 @@
-//// [tests/cases/conformance/salsa/plainJSGrammarErrors2.ts] ////
-
 //// [plainJSGrammarErrors2.js]
-
-//// [a.js]
-export default 1;
-
-//// [b.js]
-/**
- * @deprecated
- */
-export { default as A } from "./a";
+// top-level return allowed in JS script files
+return
 
 
 //// [plainJSGrammarErrors2.js]
-//// [a.js]
-export default 1;
-//// [b.js]
-/**
- * @deprecated
- */
-export { default as A } from "./a";
+// top-level return allowed in JS script files
+return;

tests/baselines/reference/plainJSGrammarErrors2.symbols

@@ -1,13 +1,5 @@
 === tests/cases/conformance/salsa/plainJSGrammarErrors2.js ===
-
-No type information for this code.=== /a.js ===
-export default 1;
+// top-level return allowed in JS script files
+No type information for this code.return
 No type information for this code.
-No type information for this code.=== /b.js ===
-/**
- * @deprecated
- */
-export { default as A } from "./a";
->default : Symbol(default, Decl(a.js, 0, 0))
->A : Symbol(A, Decl(b.js, 3, 8))
-
+No type information for this code.

tests/baselines/reference/plainJSGrammarErrors2.types

@@ -1,13 +1,5 @@
 === tests/cases/conformance/salsa/plainJSGrammarErrors2.js ===
-
-No type information for this code.=== /a.js ===
-export default 1;
+// top-level return allowed in JS script files
+No type information for this code.return
 No type information for this code.
-No type information for this code.=== /b.js ===
-/**
- * @deprecated
- */
-export { default as A } from "./a";
->default : 1
->A : 1
-
+No type information for this code.

tests/cases/conformance/salsa/plainJSGrammarErrors2.ts

@@ -4,11 +4,5 @@
 // @allowJs: true
 // @filename: plainJSGrammarErrors2.js
 
-// @filename: /a.js
-export default 1;
-
-// @filename: /b.js
-/**
- * @deprecated
- */
-export { default as A } from "./a";
+// top-level return allowed in JS script files
+return