diff --git a/Resources/Private/Php/JavaScriptMinifier.php b/Resources/Private/Php/JavaScriptMinifier.php
index 0b4be9a..2268487 100644
--- a/Resources/Private/Php/JavaScriptMinifier.php
+++ b/Resources/Private/Php/JavaScriptMinifier.php
@@ -1,4 +1,5 @@
 <?php
+// @codingStandardsIgnoreFile File external to MediaWiki. Ignore coding conventions checks.
 /**
  * JavaScript Minifier
  *
@@ -59,7 +60,7 @@ class JavaScriptMinifier {
 	const TYPE_DO          = 15; // keywords: case, var, finally, else, do, try
 	const TYPE_FUNC        = 16; // keywords: function
 	const TYPE_LITERAL     = 17; // all literals, identifiers and unrecognised tokens
-	
+
 	// Sanity limit to avoid excessive memory usage
 	const STACK_LIMIT = 1000;
 
@@ -72,9 +73,9 @@ class JavaScriptMinifier {
 	 *       literals (e.g. quoted strings) longer than $maxLineLength are encountered
 	 *       or when required to guard against semicolon insertion.
 	 *
-	 * @param $s String JavaScript code to minify
-	 * @param $statementsOnOwnLine Bool Whether to put each statement on its own line
-	 * @param $maxLineLength Int Maximum length of a single line, or -1 for no maximum.
+	 * @param string $s JavaScript code to minify
+	 * @param bool $statementsOnOwnLine Whether to put each statement on its own line
+	 * @param int $maxLineLength Maximum length of a single line, or -1 for no maximum.
 	 * @return String Minified code
 	 */
 	public static function minify( $s, $statementsOnOwnLine = false, $maxLineLength = 1000 ) {
@@ -385,7 +386,7 @@ public static function minify( $s, $statementsOnOwnLine = false, $maxLineLength
 				self::TYPE_LITERAL    => true
 			)
 		);
-		
+
 		// Rules for when newlines should be inserted if
 		// $statementsOnOwnLine is enabled.
 		// $newlineBefore is checked before switching state,
@@ -514,7 +515,7 @@ public static function minify( $s, $statementsOnOwnLine = false, $maxLineLength
 						return self::parseError($s, $end, 'Number with several E' );
 					}
 					$end++;
-					
+
 					// + sign is optional; - sign is required.
 					$end += strspn( $s, '-+', $end );
 					$len = strspn( $s, '0123456789', $end );
@@ -564,13 +565,21 @@ public static function minify( $s, $statementsOnOwnLine = false, $maxLineLength
 				$out .= ' ';
 				$lineLength++;
 			}
-			
+			if (
+				$type === self::TYPE_LITERAL
+				&& ( $token === 'true' || $token === 'false' )
+				&& ( $state === self::EXPRESSION || $state === self::PROPERTY_EXPRESSION )
+				&& $last !== '.'
+			) {
+				$token = ( $token === 'true' ) ? '!0' : '!1';
+			}
+
 			$out .= $token;
 			$lineLength += $end - $pos; // += strlen( $token )
 			$last = $s[$end - 1];
 			$pos = $end;
 			$newlineFound = false;
-			
+
 			// Output a newline after the token if required
 			// This is checked before AND after switching state
 			$newlineAdded = false;
@@ -589,7 +598,7 @@ public static function minify( $s, $statementsOnOwnLine = false, $maxLineLength
 			} elseif( isset( $goto[$state][$type] ) ) {
 				$state = $goto[$state][$type];
 			}
-			
+
 			// Check for newline insertion again
 			if ( $statementsOnOwnLine && !$newlineAdded && isset( $newlineAfter[$state][$type] ) ) {
 				$out .= "\n";
@@ -598,9 +607,9 @@ public static function minify( $s, $statementsOnOwnLine = false, $maxLineLength
 		}
 		return $out;
 	}
-	
+
 	static function parseError($fullJavascript, $position, $errorMsg) {
 		// TODO: Handle the error: trigger_error, throw exception, return false...
 		return false;
 	}
-}
+}
\ No newline at end of file