For neovim users, you can get something almost comparable with deoplete [1], tern_for_vim [2], and ternjs-deoplete [3]. I set this up recently and have been very happy with the results. This also supports ES6 and JSX in case you use either of those.

[1] https://github.com/Shougo/deoplete.nvim

[2] https://github.com/ternjs/tern_for_vim

[3] https://github.com/carlitux/deoplete-ternjs