From 4c326b2b6cb7133d3e34835489de50a23b9a721f Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Mon, 25 Jun 2018 11:36:37 -0700
Subject: [PATCH] Simplify addJSDocComment (#25196)

* Simplify addJSDocComment

* Add assert
---
 src/compiler/parser.ts | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 72b7fdc4850..c411a653cf0 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -864,13 +864,9 @@ namespace ts {
         }
 
         function addJSDocComment<T extends HasJSDoc>(node: T): T {
-            const comments = getJSDocCommentRanges(node, sourceFile.text);
-            if (comments) {
-                for (const comment of comments) {
-                    node.jsDoc = append<JSDoc>(node.jsDoc, JSDocParser.parseJSDocComment(node, comment.pos, comment.end - comment.pos));
-                }
-            }
-
+            Debug.assert(!node.jsDoc); // Should only be called once per node
+            const jsDoc = mapDefined(getJSDocCommentRanges(node, sourceFile.text), comment => JSDocParser.parseJSDocComment(node, comment.pos, comment.end - comment.pos));
+            if (jsDoc.length) node.jsDoc = jsDoc;
             return node;
         }