Comments working using vim in Svelte

Here's a minimal vim settings that I have tweaked to make the comments work using vim in Svelte

call plug#begin('~/.vim/plugged')
  Plug 'neoclide/coc.nvim', {'branch': 'release'}
  Plug 'evanleck/vim-svelte'
  Plug 'Shougo/context_filetype.vim'
  Plug 'preservim/nerdcommenter'
call plug#end()

" Settings: context_filetype

 if !exists('g:context_filetype#same_filetypes')
   let g:context_filetype#filetypes = {}
 endif

 let g:context_filetype#filetypes.svelte =
 \ [
 \   {'filetype' : 'javascript', 'start' : '<script \?.*>', 'end' : '</script>'},
 \   {
 \     'filetype': 'typescript',
 \     'start': '<script\%( [^>]*\)\? \%(ts\|lang="\%(ts\|typescript\)"\)\%( [^>]*\)\?>',
 \     'end': '',
 \   },
 \   {'filetype' : 'css', 'start' : '<style \?.*>', 'end' : '</style>'},
 \ ]

 let g:ft = ''

" " Settings: NERDCommenter

let g:NERDCustomDelimiters = { 'html': { 'left': '<!--', 'right': '-->' } }

fu! NERDCommenter_before()
  if (&ft == 'html') || (&ft == 'svelte')
  let g:ft = &ft
  let cfts = context_filetype#get_filetypes()
  if len(cfts) > 0
    if cfts[0] == 'svelte'
      let cft = 'html'
    elseif cfts[0] == 'scss'
      let cft = 'css'
    else
      let cft = cfts[0]
    endif
    exe 'setf ' . cft
    endif
  endif
endfu

fu! NERDCommenter_after()
  if (g:ft == 'html') || (g:ft == 'svelte')
  exec 'setf ' . g:ft
  let g:ft = ''
  endif
endfu

Works correctly for template (HTML), CSS, javascript and Typescript

Also works with Sapper's module context script

<script context="module">

References