Use ESNext for printing enums; no effect on declaration emit due to node reuse

Author: jakebailey

src/compiler/checker.ts

@@ -6774,7 +6774,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                         return parentName;
                     }
                     const memberName = symbolName(type.symbol);
-                    if (isIdentifierText(memberName, ScriptTarget.ES5)) {
+                    if (isIdentifierText(memberName, ScriptTarget.ESNext)) {
                         return appendReferenceToType(
                             parentName as TypeReferenceNode | ImportTypeNode,
                             factory.createTypeReferenceNode(memberName, /*typeArguments*/ undefined),

tests/baselines/reference/enumMemberNameNonIdentifier.types

@@ -31,8 +31,8 @@ export const enum E {
 
     // Greek Capital Yot (U+037F) - valid identifier in ES2015+ but NOT in ES5
     Ϳ = 4,
->Ϳ : (typeof E)["\u037F"]
->  : ^^^^^^^^^^^^^^^^^^^^
+>Ϳ : E.Ϳ
+>  : ^^^
 >4 : 4
 >  : ^
 }
@@ -78,12 +78,12 @@ export const d = E.regular;
 >        : ^^^^^^^^^
 
 export const e = E.Ϳ;
->e : (typeof E)["\u037F"]
->  : ^^^^^^^^^^^^^^^^^^^^
->E.Ϳ : (typeof E)["\u037F"]
->    : ^^^^^^^^^^^^^^^^^^^^
+>e : E.Ϳ
+>  : ^^^
+>E.Ϳ : E.Ϳ
+>    : ^^^
 >E : typeof E
 >  : ^^^^^^^^
->Ϳ : (typeof E)["\u037F"]
->  : ^^^^^^^^^^^^^^^^^^^^
+>Ϳ : E.Ϳ
+>  : ^^^