" Use emoji source.
call ddu#start({ 'sources': [{ 'name': 'emoji' }] })

" Define mapping for insert mode.
" NOTE: `:help ddu-source-emoji-faq` for details.
inoremap <C-x><C-e> <Cmd>call ddu#start({
      \ 'sources': [
      \   { 'name': 'emoji', 'options': { 'defaultAction': 'feedkeys' } },
      \ ],
      \ 'uiParams': {
      \   'ff': { 'replaceCol': col('.') }
      \ },
      \ })<CR>