From bb88ea7b1495de88a3a2bd69a2dd8fa397cf0d89 Mon Sep 17 00:00:00 2001
From: Vasek Purchart <me@vasekpurchart.cz>
Date: Mon, 25 Apr 2022 16:51:17 +0200
Subject: [PATCH] Generate only 1, not 2 newlines at the end of baseline

---
 phpstan-baseline.neon                                    | 1 -
 .../ErrorFormatter/BaselineNeonErrorFormatter.php        | 9 ++++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 2d8e472cdb8..dc1d9d033cd 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -409,4 +409,3 @@ parameters:
 			"""
 			count: 1
 			path: tests/PHPStan/Rules/Arrays/AppendedArrayKeyTypeRuleTest.php
-
diff --git a/src/Command/ErrorFormatter/BaselineNeonErrorFormatter.php b/src/Command/ErrorFormatter/BaselineNeonErrorFormatter.php
index 1f40c73422d..3005583c09f 100644
--- a/src/Command/ErrorFormatter/BaselineNeonErrorFormatter.php
+++ b/src/Command/ErrorFormatter/BaselineNeonErrorFormatter.php
@@ -7,6 +7,7 @@
 use PHPStan\Command\AnalysisResult;
 use PHPStan\Command\Output;
 use PHPStan\File\RelativePathHelper;
+use PHPStan\ShouldNotHappenException;
 use function ksort;
 use function preg_quote;
 use function substr;
@@ -70,11 +71,17 @@ public function formatErrors(
 	 */
 	private function getNeon(array $ignoreErrors): string
 	{
-		return Neon::encode([
+		$neon = Neon::encode([
 			'parameters' => [
 				'ignoreErrors' => $ignoreErrors,
 			],
 		], Neon::BLOCK);
+
+		if (substr($neon, -2) !== "\n\n") {
+			throw new ShouldNotHappenException();
+		}
+
+		return substr($neon, 0, -1);
 	}
 
 }