Modify the rest operator detection in arrow function given that there exists spread operator now

Fixes #431

TypeScript.YAML-tmLanguage

@@ -1618,9 +1618,8 @@ repository:
             (
               [(]\s*
               (
-                ([)]\s*:) |                               # ():
-                ([_$[:alpha:]][_$[:alnum:]]*\s*:) |       # [(]param:
-                (\.\.\.)                                  # [(]...
+                ([)]\s*:) |                                   # ():
+                ((\.\.\.\s*)?[_$[:alpha:]][_$[:alnum:]]*\s*:) # [(]param: | [(]...param:
               )
             ) |
             (

TypeScript.tmLanguage

@@ -4451,9 +4451,8 @@
     (
       [(]\s*
       (
-        ([)]\s*:) |                               # ():
-        ([_$[:alpha:]][_$[:alnum:]]*\s*:) |       # [(]param:
-        (\.\.\.)                                  # [(]...
+        ([)]\s*:) |                                   # ():
+        ((\.\.\.\s*)?[_$[:alpha:]][_$[:alnum:]]*\s*:) # [(]param: | [(]...param:
       )
     ) |
     (

TypeScriptReact.tmLanguage

@@ -4397,9 +4397,8 @@
     (
       [(]\s*
       (
-        ([)]\s*:) |                               # ():
-        ([_$[:alpha:]][_$[:alnum:]]*\s*:) |       # [(]param:
-        (\.\.\.)                                  # [(]...
+        ([)]\s*:) |                                   # ():
+        ((\.\.\.\s*)?[_$[:alpha:]][_$[:alnum:]]*\s*:) # [(]param: | [(]...param:
       )
     ) |
     (

tests/baselines/Issue431.baseline.txt

@@ -0,0 +1,52 @@
+original file
+-----------------------------------
+myFunc
+(...argName)
+
+function otherFunc() {} // <-- Not highlighted.
+-----------------------------------
+
+Grammar: TypeScript.tmLanguage
+-----------------------------------
+>myFunc
+ ^^^^^^
+ source.ts variable.other.readwrite.ts
+       ^^
+       source.ts
+>(...argName)
+ ^
+ source.ts meta.brace.round.ts
+  ^^^
+  source.ts keyword.operator.spread.ts
+     ^^^^^^^
+     source.ts variable.other.readwrite.ts
+            ^
+            source.ts meta.brace.round.ts
+             ^^
+             source.ts
+>
+ ^^
+ source.ts
+>function otherFunc() {} // <-- Not highlighted.
+ ^^^^^^^^
+ source.ts meta.function.ts storage.type.function.ts
+         ^
+         source.ts meta.function.ts
+          ^^^^^^^^^
+          source.ts meta.function.ts meta.definition.function.ts entity.name.function.ts
+                   ^
+                   source.ts meta.function.ts meta.parameters.ts punctuation.definition.parameters.begin.ts
+                    ^
+                    source.ts meta.function.ts meta.parameters.ts punctuation.definition.parameters.end.ts
+                     ^
+                     source.ts meta.function.ts
+                      ^
+                      source.ts meta.function.ts meta.block.ts punctuation.definition.block.ts
+                       ^
+                       source.ts meta.function.ts meta.block.ts punctuation.definition.block.ts
+                        ^
+                        source.ts
+                         ^^
+                         source.ts comment.line.double-slash.ts punctuation.definition.comment.ts
+                           ^^^^^^^^^^^^^^^^^^^^^
+                           source.ts comment.line.double-slash.ts

tests/cases/Issue431.ts

@@ -0,0 +1,4 @@
+myFunc
+(...argName)
+
+function otherFunc() {} // <-- Not highlighted.