TypeScript: fix trailing comma in enum (#1938)

* fix(typescript): fix trailing comma in enum, fixes #1932

* fix(typescript): use --trailing-comma es5 for enums

src/printer.js

@@ -2459,7 +2459,8 @@ function genericPrintNoParens(path, options, print, args) {
               indent(
                 concat([
                   hardline,
-                  printArrayItems(path, options, "members", print)
+                  printArrayItems(path, options, "members", print),
+                  shouldPrintComma(options, "es5") ? "," : ""
                 ])
               ),
               comments.printDanglingComments(

tests/typescript_trailing_comma/__snapshots__/jsfmt.spec.js.snap

@@ -5,9 +5,19 @@ export class BaseSingleLevelProfileTargeting<
 	T extends ValidSingleLevelProfileNode,
 > {
 }
+
+enum Enum {
+	x = 1,
+	y = 2,
+}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export class BaseSingleLevelProfileTargeting<
   T extends ValidSingleLevelProfileNode
 > {}
 
+enum Enum {
+  x = 1,
+  y = 2,
+}
+
 `;

tests/typescript_trailing_comma/trailing.ts

@@ -2,3 +2,8 @@ export class BaseSingleLevelProfileTargeting<
 	T extends ValidSingleLevelProfileNode,
 > {
 }
+
+enum Enum {
+	x = 1,
+	y = 2,
+}