.vimrc

# coc.nvim config only
let g:coc_global_extensions = ['coc-clangd', 'coc-tsserver', 'coc-json', 'coc-html', 'coc-css', 'coc-go', 'coc-rust-analyzer']
function! s:CheckBackSpace() abort
  let col = col('.') - 1
  return !col || getline('.')[col - 1]  =~# '\s'
endfunction
inoremap <silent><expr> <TAB>
      \ pumvisible() ? "\<C-n>" :
      \ <SID>CheckBackSpace() ? "\<TAB>" :
      \ coc#refresh()
inoremap <expr><S-TAB> pumvisible() ? "\<C-p>" : "\<C-h>"
if exists('*complete_info')
  inoremap <expr> <cr> complete_info()["selected"] != "-1" ? "\<C-y>" : "\<C-g>u\<CR>"
else
  imap <expr> <cr> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"
endif
nmap <silent> ;g <Plug>(coc-definition)
nmap <silent> ;d :call CocAction('doHover')<CR>
nmap <silent> ;t <Plug>(coc-type-definition)
nmap <silent> ;e :CocList diagnostics<CR>
nmap <silent> ;r <Plug>(coc-rename)
nmap <silent> ;h :CocCommand clangd.switchSourceHeader<CR>
nmap <silent> ;R :CocRestart<CR>
nmap <silent> <Space>o :CocList outline<CR>
nmap <silent> <Space>s :CocList symbols<CR>
function! MyReloadCoc(timerId)
  silent call coc#client#restart('coc')
endfunction
if has('macunix')
  call coc#config('clangd', {
        \ 'path': '/Users/nikki/.config/coc/extensions/coc-clangd-data/install/10.0.0/clangd_10.0.0/bin/clangd',
        \})
elseif has('win32')
  call coc#config('clangd', {
        \ 'path': 'C:\\Program Files\\LLVM\\bin\\clangd.exe',
        \})
  autocmd FileType c,cpp,objc,objcpp autocmd BufWritePost <buffer> call timer_start(40, 'MyReloadCoc')
endif
hi! CocErrorSign guifg=#fb4934

coc-settings.json

{
  "coc.source.around.enable": false,
  "coc.source.buffer.enable": false,

  "coc.preferences.hoverTarget": "float",
  "signature.target": "echo",
  "diagnostic.refreshOnInsertMode": false,

  "suggest.floatEnable": false,
  "suggest.autoTrigger": "none",

  "go.goplsOptions": {
    "deepCompletion": false,
    "completeUnimported": true
  },

  "clangd.fallbackFlags": ["-std=c++17"],

  "languageserver": {
    "nim": {
      "command": "nimlsp",
      "filetypes": ["nim"]
    }
  }
}