From d7dc07a15e256cee9232183165e2f6102f2c0873 Mon Sep 17 00:00:00 2001
From: Soufiane Boutahlil <soufiane.boutahlil@outlook.com>
Date: Fri, 30 Jul 2021 23:22:59 +0100
Subject: [PATCH] Fix: ignore lines with empty elements (fixes #12756) (#14837)

* Fix: ignore lines with empty elements (fixes #12756)

* Fix: ignore  lines with empty elements (fixes #12756)

* Fix: ignore  lines with empty elements (fixes #12756)
---
 lib/rules/comma-style.js       |  2 ++
 tests/lib/rules/comma-style.js | 38 ++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/lib/rules/comma-style.js b/lib/rules/comma-style.js
index fbdecccaac2..824ad89b2f9 100644
--- a/lib/rules/comma-style.js
+++ b/lib/rules/comma-style.js
@@ -216,6 +216,8 @@ module.exports = {
                         previousItemToken = tokenAfterItem
                             ? sourceCode.getTokenBefore(tokenAfterItem)
                             : sourceCode.ast.tokens[sourceCode.ast.tokens.length - 1];
+                    } else {
+                        previousItemToken = currentItemToken;
                     }
                 });
 
diff --git a/tests/lib/rules/comma-style.js b/tests/lib/rules/comma-style.js
index 1eb30825489..e0ac78d6813 100644
--- a/tests/lib/rules/comma-style.js
+++ b/tests/lib/rules/comma-style.js
@@ -233,7 +233,45 @@ ruleTester.run("comma-style", rule, {
                     NewExpression: true
                 }
             }]
+        },
+        "var foo = [\n , \n 1, \n 2 \n];",
+        {
+            code: "const [\n , \n , \n a, \n b, \n] = arr;",
+            options: ["last", {
+                exceptions: {
+                    ArrayPattern: false
+                }
+            }],
+            parserOptions: {
+                ecmaVersion: 6
+            }
+        },
+        {
+            code: "const [\n ,, \n a, \n b, \n] = arr;",
+            options: ["last", {
+                exceptions: {
+                    ArrayPattern: false
+                }
+            }],
+            parserOptions: {
+                ecmaVersion: 6
+            }
+        },
+        {
+            code: "const arr = [\n 1 \n , \n ,2 \n]",
+            options: ["first"],
+            parserOptions: {
+                ecmaVersion: 6
+            }
+        },
+        {
+            code: "const arr = [\n ,'fifi' \n]",
+            options: ["first"],
+            parserOptions: {
+                ecmaVersion: 6
+            }
         }
+
     ],
 
     invalid: [