Markdown Formatting removes folded text at the end of the file when it removes empty lines

[ModProg]

BUG

This seams to only happen when in a heading level higher than the fold level in my case 2, The only other markdown plugin I have is plasticboy/vim-markdown which is responsible for the folding.

This issue does not exist for :PrettierCli. Therefor I am unsure if this is a vim-prettier or a vim-markdown issue.

Expected behavior

### test

Some Text

should result in

### test

Some Text

but produces

### test

PrettierVersion: 1.0.0-beta
PrettierCliVersion: 2.0.4
NVIM: 0.5.0-dev+1233-g82ac44d01

[biggytech]

I experience the same issue with JavaScript and TypeScript files.

I have auto format running on save:

" Run Prettier on :w
 augroup Prettier
  au!
  au BufWritePre *.tsx,*.ts,*.js,*.jsx,*.css,*.scss PrettierAsync
augroup END

When saving a file Prettier formats it and truncates the file.

I was able to confirm that the issue relates to having folded code: if I disable code folding, then the Prettier doesn't truncate a file. Looks like that Prettier truncates folded code. BTW my fold config:

set foldmethod=syntax
set foldlevel=3

let g:javaScript_fold=1 "activate folding by JS syntax
augroup jsFolds
    autocmd!
    autocmd FileType javascript,typescript,json syntax region braceFold start="{" end="}" transparent fold
    autocmd FileType javascript,typescript,json syntax sync fromstart
    autocmd FileType javascript,typescript,json set foldmethod=syntax
augroup end

So for now my workaround to fix this is to set set foldlevel=99 before Prettier runs:

" Run Prettier on :w
 augroup Prettier
  au!
  " foldlevel fixes Prettier bug where it removes all folds from the file on format
  au BufWritePre *.tsx,*.ts,*.js,*.jsx,*.css,*.scss set foldlevel=99 | PrettierAsync
augroup END

This is not very convenient, but I didn't find other options to fix it.

btw related issue: peitalin/vim-jsx-typescript#20