Fix const enum comments (#47990)

* chore: add test case

* fix: const enum comment

* fix: replace all unsafe pattern

* chore: run regex only if element access

Author: magic-akari

src/compiler/transformers/ts.ts

@@ -3355,6 +3355,10 @@ namespace ts {
             return substituteConstantValue(node);
         }
 
+        function safeMultiLineComment(value: string): string {
+            return value.replace(/\*\//g, "*_/");
+        }
+
         function substituteConstantValue(node: PropertyAccessExpression | ElementAccessExpression): LeftHandSideExpression {
             const constantValue = tryGetConstEnumValue(node);
             if (constantValue !== undefined) {
@@ -3366,7 +3370,7 @@ namespace ts {
                     const originalNode = getOriginalNode(node, isAccessExpression);
                     const propertyName = isPropertyAccessExpression(originalNode)
                         ? declarationNameToString(originalNode.name)
-                        : getTextOfNode(originalNode.argumentExpression);
+                        : safeMultiLineComment(getTextOfNode(originalNode.argumentExpression));
 
                     addSyntheticTrailingComment(substitute, SyntaxKind.MultiLineCommentTrivia, ` ${propertyName} `);
                 }

tests/baselines/reference/constEnums.js

@@ -38,6 +38,15 @@ const enum Enum1 {
     W5 = Enum1[`V`],
 }
 
+const enum Comments {
+    "//",
+    "/*",
+    "*/",
+    "///",
+    "#",
+    "<!--",
+    "-->",
+}
 
 module A {
     export module B {
@@ -153,7 +162,21 @@ function bar(e: A.B.C.E): number {
         case A.B.C.E.V2: return 1;
         case A.B.C.E.V3: return 1;
     }
-}
+}
+
+function baz(c: Comments) {
+    switch (c) {
+        case Comments["//"]:
+        case Comments["/*"]:
+        case Comments["*/"]:
+        case Comments["///"]:
+        case Comments["#"]:
+        case Comments["<!--"]:
+        case Comments["-->"]:
+        break;
+    }
+}
+
 
 //// [constEnums.js]
 var A2;
@@ -226,3 +249,15 @@ function bar(e) {
         case 64 /* V3 */: return 1;
     }
 }
+function baz(c) {
+    switch (c) {
+        case 0 /* "//" */:
+        case 1 /* "/*" */:
+        case 2 /* "*_/" */:
+        case 3 /* "///" */:
+        case 4 /* "#" */:
+        case 5 /* "<!--" */:
+        case 6 /* "-->" */:
+            break;
+    }
+}