Tokenize illegal parameters

Author: MaximSokolov

grammars/javascript.cson

@@ -1173,6 +1173,14 @@
           '1':
             'name': 'variable.parameter.function.js'
       }
+      {
+        'match': '(\\d[\\w$]*)'
+        'captures':
+          '0':
+            'name': 'meta.parameters.js'
+          '1':
+            'name': 'invalid.illegal.identifier.js'
+      }
     ]
   'arguments':
     'patterns': [

spec/javascript-spec.coffee

@@ -1115,6 +1115,15 @@ describe "Javascript grammar", ->
       expect(tokens[1]).toEqual value: '...', scopes: ['source.js', 'meta.function.arrow.js', 'meta.parameters.js', 'keyword.operator.spread.js']
       expect(tokens[2]).toEqual value: 'args', scopes: ['source.js', 'meta.function.arrow.js', 'meta.parameters.js', 'variable.parameter.rest.function.js']
 
+    it "tokenizes illegal parameters", ->
+      {tokens} = grammar.tokenizeLine('0abc => {}')
+      expect(tokens[0]).toEqual value: '0abc', scopes: ['source.js', 'meta.function.arrow.js', 'meta.parameters.js', 'invalid.illegal.identifier.js']
+      expect(tokens[2]).toEqual value: '=>', scopes: ['source.js', 'meta.function.arrow.js', 'storage.type.function.arrow.js']
+
+      {tokens} = grammar.tokenizeLine('(0abc) => {}')
+      expect(tokens[1]).toEqual value: '0abc', scopes: ['source.js', 'meta.function.arrow.js', 'meta.parameters.js', 'invalid.illegal.identifier.js']
+      expect(tokens[4]).toEqual value: '=>', scopes: ['source.js', 'meta.function.arrow.js', 'storage.type.function.arrow.js']
+
   describe "variables", ->
     it "tokenizes 'this'", ->
       {tokens} = grammar.tokenizeLine('this')