YAJS: Yet Another JavaScript Syntax

Yet Another JavaScript Syntax file for Vim. Key differences:

Use 'javascript' as group name's prefix, not 'javaScript' nor 'JavaScript'. Works great with SyntaxComplete.
Recognize Web API and DOM keywords. Base on Mozilla's WebIDL files
Works perfect with javascript-libraries-syntax.vim
Remove old, unused syntax definitions.
Support new syntax, ex: async, arrow function: =>.

For ES.Next features such as decorator, binding operator. Please install es.next.syntax.vim.

Differences from jelera/vim-javascript-syntax

I start a new project instead of send PR to jelera is because: jelera/vim-javascript-syntax is not so active. And I want to do lots of changes, including ES6 and other not confirmed standard support. Also, one of my goal is produce 100% correct syntax. But it hurt performance, so I prefer to create a new one instead of merge back.

Installation

Use pathogen or vundle is recommended. Vundle:

Plugin 'othree/yajs.vim'

2.0

Major change in 2.0 is the basic object/method data comes from Mozilla's WebIDL. Current master branch is 2.0 beta. If its not stable for you. You can git checkout 1.6.

Performance Issue

yajs.vim is not good on performance. If you are using a slower computer. You might feel lag while moving cursor. You can try disable cursorline and colorcolumn, or reduce the number of synmaxcol. Another possible solution is change to neovim

If you still want cursorline highlight, some terminal have their built in support. Ex: iTerm2, Edit Profile -> Colors -> Cursor Colors.

Credits

Jose Elera, Enhanced Javascript syntax
Zhao Yi, Claudio Fleiner, Scott Shattuck (This file is based on their hard work)
gumnos (From the #vim IRC Channel in Freenode) (Who helped me figured out the crazy Vim Regexes)