vimrc using CoC for language server

.nvimrc

call plug#begin('~/.vim/plugged')

" file-browser inside of Vim
Plug 'scrooloose/nerdtree', { 'on':  ['NERDTreeToggle', 'NERDTreeFind'] }

" on-demand loaded syntax highlighters for many languages
Plug 'sheerun/vim-polyglot'

" fuzzy file find
Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
Plug 'junegunn/fzf.vim'

" onedark color
Plug 'joshdick/onedark.vim'

" atome one dark/light
Plug 'rakr/vim-one'

" LaTeX support
Plug 'lervag/vimtex'

" git plugin
Plug 'tpope/vim-fugitive'

" git hunks
Plug 'airblade/vim-gitgutter'

" allows plugins that work with language servers
Plug 'neoclide/coc.nvim', {'branch': 'release'}

" syntax highlighting for css-in-js from styled-components
" Plug 'styled-components/vim-styled-components', { 'branch': 'main' }

" status line
Plug 'vim-airline/vim-airline'

" tags in bar
Plug 'majutsushi/tagbar'

" show function / scope context
" Plug 'wellle/context.vim'

call plug#end()

filetype plugin on
syntax enable
nmap cp :let @+ = expand("%")<CR>
set shell=/bin/zsh

autocmd BufWritePre *.rs,*.js,*.ts,*.jsx,*.tsx,*.py Format

let g:airline#extensions#tagbar#flags = 'f'  " show full tag hierarchy

let g:coc_global_extensions = ['coc-tabnine', 'coc-eslint', 'coc-tsserver', 'coc-prettier', 'coc-stylelint', 'coc-rust-analyzer']

map <silent> <C-n> :NERDTreeToggle<CR>
map <silent> <Leader>t :TagbarToggle<CR>
map <silent> <Leader>F :NERDTreeFind<CR>
map <silent> <Leader>p :Files<CR>
set number
set relativenumber
set mouse=a
colo one
" don't show bottom line that says `--Insert` since lightline takes care of it
set noshowmode

" setup COC

" TextEdit might fail if hidden is not set.
set hidden

" Some servers have issues with backup files, see #649.
set nobackup
set nowritebackup

set cmdheight=1

" Having longer updatetime (default is 4000 ms = 4 s) leads to noticeable
" delays and poor user experience.
set updatetime=300

" Don't pass messages to |ins-completion-menu|.
set shortmess+=c

inoremap <silent><expr> <c-space> coc#refresh()

" Make <CR> auto-select the first completion item and notify coc.nvim to
" format on enter, <cr> could be remapped by other vim plugin
inoremap <silent><expr> <cr> pumvisible() ? coc#_select_confirm()
                              \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"

" Use `[g` and `]g` to navigate diagnostics
" Use `:CocDiagnostics` to get all diagnostics of current buffer in location list.
nmap <silent> [g <Plug>(coc-diagnostic-prev)
nmap <silent> ]g <Plug>(coc-diagnostic-next)

" GoTo code navigation.
nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gy <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)

" Use K to show documentation in preview window.
nnoremap <silent> K :call <SID>show_documentation()<CR>

function! s:show_documentation()
  if (index(['vim','help'], &filetype) >= 0)
    execute 'h '.expand('<cword>')
  elseif (coc#rpc#ready())
    call CocActionAsync('doHover')
  else
    execute '!' . &keywordprg . " " . expand('<cword>')
  endif
endfunction

" Highlight the symbol and its references when holding the cursor.
autocmd CursorHold * silent call CocActionAsync('highlight')

" Symbol renaming.
nmap <leader>rn <Plug>(coc-rename)

" Formatting selected code.
xmap <leader>f  <Plug>(coc-format-selected)
nmap <leader>f  <Plug>(coc-format-selected)

augroup mygroup
  autocmd!
  " Setup formatexpr specified filetype(s).
  autocmd FileType typescript,json setl formatexpr=CocAction('formatSelected')
  " Update signature help on jump placeholder.
  autocmd User CocJumpPlaceholder call CocActionAsync('showSignatureHelp')
augroup end

" Applying codeAction to the selected region.
" Example: `<leader>aap` for current paragraph
xmap <leader>a  <Plug>(coc-codeaction-selected)
nmap <leader>a  <Plug>(coc-codeaction-selected)

" Remap keys for applying codeAction to the current buffer.
nmap <leader>ac  <Plug>(coc-codeaction)
" Apply AutoFix to problem on the current line.
nmap <leader>qf  <Plug>(coc-fix-current)

" Map function and class text objects
" NOTE: Requires 'textDocument.documentSymbol' support from the language server.
xmap if <Plug>(coc-funcobj-i)
omap if <Plug>(coc-funcobj-i)
xmap af <Plug>(coc-funcobj-a)
omap af <Plug>(coc-funcobj-a)
xmap ic <Plug>(coc-classobj-i)
omap ic <Plug>(coc-classobj-i)
xmap ac <Plug>(coc-classobj-a)
omap ac <Plug>(coc-classobj-a)

" Remap <C-f> and <C-b> for scroll float windows/popups.
" Note coc#float#scroll works on neovim >= 0.4.0 or vim >= 8.2.0750
nnoremap <nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
nnoremap <nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
inoremap <nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
inoremap <nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"

vnoremap <nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#nvim_scroll(1, 1) : "\<C-f>"
vnoremap <nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#nvim_scroll(0, 1) : "\<C-b>"

" Use CTRL-S for selections ranges.
" Requires 'textDocument/selectionRange' support of language server.
nmap <silent> <C-s> <Plug>(coc-range-select)
xmap <silent> <C-s> <Plug>(coc-range-select)

" Add `:Format` command to format current buffer.
command! -nargs=0 Format :call CocAction('format')

" Add `:Fold` command to fold current buffer.
command! -nargs=? Fold :call     CocAction('fold', <f-args>)

" Add `:OR` command for organize imports of the current buffer.
command! -nargs=0 OR   :call     CocAction('runCommand', 'editor.action.organizeImport')

" Mappings for CoCList
" Show all diagnostics.
nnoremap <silent><nowait> <space>a  :<C-u>CocList diagnostics<cr>
" Manage extensions.
nnoremap <silent><nowait> <space>e  :<C-u>CocList extensions<cr>
" Show commands.
nnoremap <silent><nowait> <space>c  :<C-u>CocList commands<cr>
" Find symbol of current document.
nnoremap <silent><nowait> <space>o  :<C-u>CocList outline<cr>
" Search workspace symbols.
nnoremap <silent><nowait> <space>s  :<C-u>CocList -I symbols<cr>
" Do default action for next item.
nnoremap <silent><nowait> <space>j  :<C-u>CocNext<CR>
" Do default action for previous item.
nnoremap <silent><nowait> <space>k  :<C-u>CocPrev<CR>
" Resume latest coc list.
nnoremap <silent><nowait> <space>p  :<C-u>CocListResume<CR>
nmap <silent> gs :sp<CR><Plug>(coc-definition)
nmap <silent> gS :vsp<CR><Plug>(coc-definition)
nmap <silent> <Leader>b :Buffers<CR>