do not handle enum type member

src/services/codefixes/fixAddMissingMember.ts

@@ -240,7 +240,7 @@ namespace ts.codefix {
          */
         const hasStringInitializer = some(enumDeclaration.members, member => {
             const type = checker.getTypeAtLocation(member);
-            return !!(type && type.flags & (TypeFlags.StringLike | TypeFlags.Enum));
+            return !!(type && type.flags & TypeFlags.StringLike);
         });
 
         const enumMember = createEnumMember(token, hasStringInitializer ? createStringLiteral(token.text) : undefined);

tests/cases/fourslash/codeFixAddMissingEnumMember10.ts

@@ -19,7 +19,7 @@ verify.codeFix({
 }
 enum A {
     a = E.c,
-    b = "b"
+    b
 }
 A.b`
 });

tests/cases/fourslash/codeFixAddMissingEnumMember11.ts

@@ -25,8 +25,7 @@ enum A {
 }
 enum B {
     b = A.a,
-    c = "c"
+    c
 }
 B.c`
 });
-

tests/cases/fourslash/codeFixAddMissingEnumMember9.ts

@@ -19,7 +19,7 @@ verify.codeFix({
 }
 enum A {
     a = E.a,
-    b = "b"
+    b
 }
 A.b`
 });