From 8768b2d5199e953e61311cdee764af5e74f3d61a Mon Sep 17 00:00:00 2001
From: Teddy Katz <teddy.katz@gmail.com>
Date: Wed, 18 Oct 2017 12:55:54 -0400
Subject: [PATCH] Fix: multiline-comment-style autofixer added trailing space
 (#9454)

This updates the multiline-comment-style autofixer to avoid adding a space after the `starred-block` asterisk for blank lines.
---
 lib/rules/multiline-comment-style.js       |  8 +++--
 tests/lib/rules/multiline-comment-style.js | 34 ++++++++++++++++++++++
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/lib/rules/multiline-comment-style.js b/lib/rules/multiline-comment-style.js
index cde28fd88d6..0972b7cc783 100644
--- a/lib/rules/multiline-comment-style.js
+++ b/lib/rules/multiline-comment-style.js
@@ -174,8 +174,12 @@ module.exports = {
                                     : MISSING_STAR_ERROR,
                                 fix(fixer) {
                                     const lineStartIndex = sourceCode.getIndexFromLoc({ line: lineNumber, column: 0 });
-                                    const commentStartIndex = lineStartIndex + lineText.match(/^\s*\*? ?/)[0].length;
-                                    const replacementText = lineNumber === block.loc.end.line ? expectedLinePrefix : `${expectedLinePrefix} `;
+                                    const linePrefixLength = lineText.match(/^\s*\*? ?/)[0].length;
+                                    const commentStartIndex = lineStartIndex + linePrefixLength;
+
+                                    const replacementText = lineNumber === block.loc.end.line || lineText.length === linePrefixLength
+                                        ? expectedLinePrefix
+                                        : `${expectedLinePrefix} `;
 
                                     return fixer.replaceTextRange([lineStartIndex, commentStartIndex], replacementText);
                                 }
diff --git a/tests/lib/rules/multiline-comment-style.js b/tests/lib/rules/multiline-comment-style.js
index 37739a4c9ba..9da55a99575 100644
--- a/tests/lib/rules/multiline-comment-style.js
+++ b/tests/lib/rules/multiline-comment-style.js
@@ -332,6 +332,40 @@ ruleTester.run("multiline-comment-style", rule, {
             `,
             errors: [{ message: ALIGNMENT_ERROR, line: 5 }]
         },
+        {
+            code: `
+                /*
+                 * the following line
+                *
+                 * is blank
+                 */
+            `,
+            output: `
+                /*
+                 * the following line
+                 *
+                 * is blank
+                 */
+            `,
+            errors: [{ message: ALIGNMENT_ERROR, line: 4 }]
+        },
+        {
+            code: `
+                /*
+                 * the following line
+                  *
+                 * is blank
+                 */
+            `,
+            output: `
+                /*
+                 * the following line
+                 *
+                 * is blank
+                 */
+            `,
+            errors: [{ message: ALIGNMENT_ERROR, line: 4 }]
+        },
         {
             code: `
                 /*