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let files = filter(globpath(&rtp, 'syntax/basic/function.vim', 1, 1), { _, v -> v !~ "vim-polyglot" && v !~ $VIMRUNTIME && v !~ "after" })
if len(files) > 0
  exec 'source ' . files[0]
  finish
endif
if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'typescript') == -1

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*\({\_[^}]*}\|\k\+\)\(:\_[^)]\)\?,\?\)\+)\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

endif