Use tern with vim for node.js development.

.tern-project

{
    "libs": [
        "browser",
        "underscore",
        "jquery"
            ],
        "plugins": {
          "node": {}
        }
}

.vimrc

"""""""""""""""""
" Tern settings
"""""""""""""""""
Bundle 'marijnh/tern_for_vim'
let g:tern_show_argument_hints='on_hold'
" and 
let g:tern_map_keys=1

README.md

In order to get node.js completion with tern, you will need a .tern-project file. A sample file is included below.

Installation

Place the .tern-project file inside your project directory. You can also have a global ~/.tern-project file located in your home directory

Resources

• Another installation guide http://ahalbert.nfshost.com/Tech/Installing_Tern_for_Vim.html
• Tern keyboard shortcuts in vim http://usevim.com/2013/05/24/tern/
• PDF of shortcuts http://usevim.com/files/tern_keyboard.pdf

so i had this same issue again and googled my own answer from half a year ago
which didn't help...

make sure you use tern with filetype=javascript.
tern doesn't register its commands for other filetypes, in my case it was typescript.
obvious now but easy to forget when often switching between js & ts.