From 1b55fec69989f49cbe245adb2b9db7759b31ba87 Mon Sep 17 00:00:00 2001
From: David Sherret <dsherret@gmail.com>
Date: Sun, 1 Sep 2019 10:41:20 -0400
Subject: [PATCH] chore: Reduce string allocations.

---
 src/compiler/ast/doc/JSDoc.ts | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/compiler/ast/doc/JSDoc.ts b/src/compiler/ast/doc/JSDoc.ts
index 80ccaf0da..c5d55f697 100644
--- a/src/compiler/ast/doc/JSDoc.ts
+++ b/src/compiler/ast/doc/JSDoc.ts
@@ -2,7 +2,7 @@ import { removeChildren, replaceTextPossiblyCreatingChildNodes } from "../../../
 import { getPreviousMatchingPos } from "../../../manipulation/textSeek";
 import { WriterFunction } from "../../../types";
 import { ts } from "../../../typescript";
-import { getTextFromStringOrWriter } from "../../../utils";
+import { getTextFromStringOrWriter, StringUtils } from "../../../utils";
 import { Node } from "../common";
 import { JSDocTag } from "./JSDocTag";
 import { JSDocStructure, JSDocSpecificStructure, StructureKind } from "../../../structures";
@@ -38,12 +38,24 @@ export class JSDoc extends JSDocBase<ts.JSDoc> {
         const innerTextWithStars = this.getText().replace(/^\/\*\*[^\S\n]*\n?/, "").replace(/(\r?\n)?[^\S\n]*\*\/$/, "");
 
         return innerTextWithStars.split(/\n/).map(line => {
-            const starPos = line.indexOf("*");
-            if (starPos === -1 || line.substring(0, starPos).trim() !== "")
+            const starPos = getStarPosIfFirstNonWhitespaceChar(line);
+            if (starPos === -1)
                 return line;
             const substringStart = line[starPos + 1] === " " ? starPos + 2 : starPos + 1;
             return line.substring(substringStart);
         }).join("\n");
+
+        function getStarPosIfFirstNonWhitespaceChar(text: string) {
+            for (let i = 0; i < text.length; i++) {
+                const char = text[i];
+                if (char === "*")
+                    return i;
+                else if (!StringUtils.isWhitespaceChar(char))
+                    break;
+            }
+
+            return -1;
+        }
     }
 
     /**