Fix the lookbehind for multiline arrow to include return keyword

Fixes #672

Author: sheetalkamat

TypeScript.YAML-tmLanguage

@@ -57,7 +57,7 @@ variables:
   inlineComment: \/\*([^\*]|(\*[^\/]))*\*\/
   startOfDeclaration: '{{startOfIdentifier}}(?:(\bexport)\s+)?(?:(\bdeclare)\s+)?'
   lookBehindOfPossiblyMultilineArrowWithDestructuring: (?<=[(=,])
-  lookBehindOfPossiblyMultilineArrow: (?<=[(=,]|=>)
+  lookBehindOfPossiblyMultilineArrow: (?<=[(=,]|=>|{{lookBehindReturn}})
   lookBehindOfObjectMemberPossiblyMultilineArrow: (?<=:)
   # Identifier start | matching braces | matching parenthesis | matching square brackets
   typeParamersStart: ([_$[:alpha:]]|{{matchingBraces}}|{{matchingParenthesis}}|{{matchingBrackets}})

TypeScript.tmLanguage

@@ -4538,7 +4538,7 @@
           </dict>
           <dict>
             <key>begin</key>
-            <string>(?&lt;=[(=,]|=&gt;)\s*(async)?(?=\s*((((&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;]|\&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;])*\&gt;)*&gt;\s*))?\()|(&lt;))\s*$)</string>
+            <string>(?&lt;=[(=,]|=&gt;|^return|[^\._$[:alnum:]]return)\s*(async)?(?=\s*((((&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;]|\&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;])*\&gt;)*&gt;\s*))?\()|(&lt;))\s*$)</string>
             <key>beginCaptures</key>
             <dict>
               <key>1</key>

TypeScriptReact.tmLanguage

@@ -4542,7 +4542,7 @@
           </dict>
           <dict>
             <key>begin</key>
-            <string>(?&lt;=[(=,]|=&gt;)\s*(async)?(?=\s*((((&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;]|\&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;])*\&gt;)*&gt;\s*))?\()|(&lt;))\s*$)</string>
+            <string>(?&lt;=[(=,]|=&gt;|^return|[^\._$[:alnum:]]return)\s*(async)?(?=\s*((((&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;]|\&lt;\s*([_$[:alpha:]]|(\{([^\{\}]|(\{[^\{\}]*\}))*\})|(\(([^\(\)]|(\([^\(\)]*\)))*\))|(\[([^\[\]]|(\[[^\[\]]*\]))*\]))([^=&lt;&gt;]|=[^&lt;])*\&gt;)*&gt;\s*))?\()|(&lt;))\s*$)</string>
             <key>beginCaptures</key>
             <dict>
               <key>1</key>