Switch typescript provider, closes #428

syntax/basic/function.vim

@@ -0,0 +1,71 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'typescript') != -1
+  finish
+endif
+
+syntax keyword typescriptAsyncFuncKeyword      async
+  \ nextgroup=typescriptFuncKeyword,typescriptArrowFuncDef
+  \ skipwhite
+
+syntax keyword typescriptAsyncFuncKeyword      await
+  \ nextgroup=@typescriptValue
+  \ skipwhite
+
+syntax keyword typescriptFuncKeyword           function
+  \ nextgroup=typescriptAsyncFunc,typescriptFuncName,@typescriptCallSignature
+  \ skipwhite skipempty
+
+syntax match   typescriptAsyncFunc             contained /*/
+  \ nextgroup=typescriptFuncName,@typescriptCallSignature
+  \ skipwhite skipempty
+
+syntax match   typescriptFuncName              contained /\K\k*/
+  \ nextgroup=@typescriptCallSignature
+  \ skipwhite
+
+" destructuring ({ a: ee }) =>
+syntax match   typescriptArrowFuncDef          contained /({\_[^}]*}\(:\_[^)]\)\?)\s*=>/
+  \ contains=typescriptArrowFuncArg,typescriptArrowFunc
+  \ nextgroup=@typescriptExpression,typescriptBlock
+  \ skipwhite skipempty
+
+" matches `(a) =>` or `([a]) =>` or
+" `(
+"  a) =>`
+syntax match   typescriptArrowFuncDef          contained /(\(\_s*[a-zA-Z\$_\[.]\_[^)]*\)*)\s*=>/
+  \ contains=typescriptArrowFuncArg,typescriptArrowFunc
+  \ nextgroup=@typescriptExpression,typescriptBlock
+  \ skipwhite skipempty
+
+syntax match   typescriptArrowFuncDef          contained /\K\k*\s*=>/
+  \ contains=typescriptArrowFuncArg,typescriptArrowFunc
+  \ nextgroup=@typescriptExpression,typescriptBlock
+  \ skipwhite skipempty
+
+" TODO: optimize this pattern
+syntax region   typescriptArrowFuncDef          contained start=/(\_[^)]*):/ end=/=>/
+  \ contains=typescriptArrowFuncArg,typescriptArrowFunc,typescriptTypeAnnotation
+  \ nextgroup=@typescriptExpression,typescriptBlock
+  \ skipwhite skipempty keepend
+
+syntax match   typescriptArrowFunc             /=>/
+syntax match   typescriptArrowFuncArg          contained /\K\k*/
+syntax region  typescriptArrowFuncArg          contained start=/<\|(/ end=/\ze=>/ contains=@typescriptCallSignature
+
+syntax region typescriptReturnAnnotation contained start=/:/ end=/{/me=e-1 contains=@typescriptType nextgroup=typescriptBlock
+
+
+syntax region typescriptFuncImpl contained start=/function/ end=/{/me=e-1
+  \ contains=typescriptFuncKeyword
+  \ nextgroup=typescriptBlock
+
+syntax cluster typescriptCallImpl contains=typescriptGenericImpl,typescriptParamImpl
+syntax region typescriptGenericImpl matchgroup=typescriptTypeBrackets
+  \ start=/</ end=/>/ skip=/\s*,\s*/
+  \ contains=typescriptTypeParameter
+  \ nextgroup=typescriptParamImpl
+  \ contained skipwhite
+syntax region typescriptParamImpl matchgroup=typescriptParens
+  \ start=/(/ end=/)/
+  \ contains=typescriptDecorator,@typescriptParameterList,@typescriptComments
+  \ nextgroup=typescriptReturnAnnotation,typescriptBlock
+  \ contained skipwhite skipnl