Javascript mode crash opening 6380 loc javascript file

[codygman]

Using Yi (33306ea) and javascript-mode on a very large javascript file from react:

https://github.com/facebook/react/blob/e35724a03d66bb73dbbec4dc4b12a5170bfe2615/src/__mocks__/vendor/third_party/WebComponents.js

I opened the file in vty mode with vim keybindings and then tried to go to the end of the file with G in vim mode. It consumed all of my memory and I had to reboot my system.

[codygman]

Added specific commit of Yi I was using.

[codygman]

Could very well be related to #105.

[noughtmare]

From the author of the mode #143 (comment). It seems yi-mode-javascript is abandoned. I think the best option to solve this is to make a fastMode equivalent that just uses the lexer to do the highlighting.

[codygman]

@noughtmare Alright, thanks for the direction. I was using the Javascript mode to see how Yi fared for incremental parsing on large files. #105 leads me to believe that until that issue the leak issue is fixed there will be performance issues.

[noughtmare]

@codygman A fastMode would only use the lexer and therefore bypass the whole incremental parser.

But the performance problems in the javascript mode are much more severe than for example in the haskell mode. So I think improvement is still possible.