Added support for params in arrows

grammars/javascript.cson

@@ -273,6 +273,25 @@
         'name': 'entity.name.type.js'
     'name': 'meta.class.js'
   }
+  {
+    'name': 'meta.function.arrow.js'
+    'begin': '(?<![A-Za-z0-9])(\\()(?=(?:[^\\(\\)]*)?\\)\\s*=>)'
+    'beginCaptures':
+      '1':
+        'name': 'punctuation.definition.parameters.begin.js'
+
+    'end': '(\\))(\\s*=>)'
+    'endCaptures':
+      '1':
+        'name': 'punctuation.definition.parameters.end.js'
+      '2':
+        'name': 'storage.type.arrow.js'
+    'patterns': [
+      {
+        'include': '#function-params'
+      }
+    ]
+  }
   {
     'captures':
       '1':

spec/javascript-spec.coffee

@@ -227,6 +227,14 @@ describe "Javascript grammar", ->
       {tokens} = grammar.tokenizeLine('default: ')
       expect(tokens[0]).toEqual value: 'default', scopes: ['source.js', 'keyword.control.js']
 
+  it "tokenizes arrow functions with params", ->
+    {tokens} = grammar.tokenizeLine('(param1,param2)=>{}')
+    expect(tokens[0]).toEqual value: '(', scopes: ['source.js', 'meta.function.arrow.js', 'punctuation.definition.parameters.begin.js']
+    expect(tokens[1]).toEqual value: 'param1', scopes: ['source.js', 'meta.function.arrow.js', 'variable.parameter.function.js']
+    expect(tokens[3]).toEqual value: 'param2', scopes: ['source.js', 'meta.function.arrow.js', 'variable.parameter.function.js']
+    expect(tokens[4]).toEqual value: ')', scopes: ['source.js', 'meta.function.arrow.js', 'punctuation.definition.parameters.end.js']
+    expect(tokens[5]).toEqual value: '=>', scopes: ['source.js', 'meta.function.arrow.js', 'storage.type.arrow.js']
+
   it "tokenizes comments in function params", ->
     {tokens} = grammar.tokenizeLine('foo: function (/**Bar*/bar){')