feat: preserve comments for enum members in TypeScript output

bindings/expressions.go

@@ -177,6 +177,7 @@ type EnumMember struct {
 	Name string
 	// Value is allowed to be nil, which results in `undefined`.
 	Value ExpressionType
+	SupportComments
 }
 
 func (*EnumMember) isNode()           {}

convert.go

@@ -632,10 +632,15 @@ func (ts *Typescript) parse(obj types.Object) error {
 		// type. However, the order types are parsed is not guaranteed, so we
 		// add the enum to the Alias as a post-processing step.
 		ts.updateNode(enumObjName.Ref(), func(n *typescriptNode) {
-			n.AddEnum(&bindings.EnumMember{
+			member := &bindings.EnumMember{
 				Name:  obj.Name(),
 				Value: constValue,
-			})
+			}
+			if ts.preserveComments {
+				cmts := ts.parsed.CommentForObject(obj)
+				member.AppendComments(cmts)
+			}
+			n.AddEnum(member)
 		})
 		return nil
 	case *types.Func:

testdata/enums/enums.go

@@ -15,21 +15,25 @@ type (
 
 const (
 	// EnumFoo is the "foo" value
+	// This comment should be preserved
 	EnumFoo EnumString = "foo"
+	// EnumBar is the "bar" value
 	EnumBar EnumString = "bar"
 	EnumBaz EnumString = "baz"
 	EnumQux EnumString = "qux"
 )
 
 const (
+	// EnumNumFoo is the number 5
 	EnumNumFoo EnumInt = 5
 	EnumNumBar EnumInt = 10
 )
 
 const (
 	AudienceWorld  Audience = "world"
 	AudienceTenant Audience = "tenant"
-	AudienceTeam   Audience = "team"
+	// AudienceTeam is the "team" value
+	AudienceTeam Audience = "team"
 )
 
 // EmptyEnum references `time.Duration`, so the constant is considered an enum.

testdata/enums/enums.ts

@@ -2,6 +2,9 @@
 
 // From enums/enums.go
 export enum Audience {
+    /**
+     * AudienceTeam is the "team" value
+     */
     Team = "team",
     Tenant = "tenant",
     World = "world"
@@ -10,6 +13,9 @@ export enum Audience {
 // From enums/enums.go
 export enum EnumInt {
     EnumNumBar = 10,
+    /**
+     * EnumNumFoo is the number 5
+     */
     EnumNumFoo = 5
 }
 
@@ -21,8 +27,15 @@ export type EnumSliceType = readonly EnumString[];
 
 // From enums/enums.go
 export enum EnumString {
+    /**
+     * EnumBar is the "bar" value
+     */
     EnumBar = "bar",
     EnumBaz = "baz",
+    /**
+     * EnumFoo is the "foo" value
+     * This comment should be preserved
+     */
     EnumFoo = "foo",
     EnumQux = "qux"
 }