Add tern for smart JavaScript completion and configure mucomplete to work well with it

config/vim/init.vim

@@ -47,6 +47,7 @@ endif
 inoremap jj <Esc>
 nnoremap <C-t> :Files<CR>
 
+
 if exists('+belloff')
   set belloff+=ctrlg
 endif
@@ -83,3 +84,14 @@ endif
 let g:airline_powerline_fonts = 1
 let g:LatexBox_Folding = 1
 let g:NERDTreeHijackNetrw = 1
+
+let g:mucomplete#can_complete = {
+  \'default': {
+    \'omni': {t -> strlen(&l:omnifunc) > 0 && t =~# '\m\k\%(\k\|\.\)$'}
+  \}
+\}
+
+" For lifepillar/vim-mucomplete and tpope/vim-endwise to play well together,
+" this mapping is required. :he mucomplete-compatibility
+imap <Plug>MyCR <Plug>(MUcompleteCR)
+imap <cr> <Plug>MyCR

config/vim/plugins.vim

@@ -39,6 +39,7 @@ endif
 
 call Plug('k-takata/minpac', {'type': 'opt'})
 call Plug('tpope/vim-sensible')
+call Plug('prabirshrestha/async.vim')
 
 call Plug('ciaranm/inkpot', {'type': 'opt', 'do': 'colorscheme inkpot'})
 call Plug('morhetz/gruvbox', {'type': 'opt'})
@@ -73,6 +74,8 @@ call Plug('sukima/xmledit')
 
 call Plug('lepture/vim-jinja')
 
+call Plug('ternjs/tern_for_vim', {'do': {-> async#job#start(['npm', 'install'], {})}})
+
 call Plug('alx741/yesod.vim')
 call Plug('pbrisbin/vim-syntax-shakespeare')