Add GJS environment

[mattiasb]

GJS is a JavaScript environment used in the GNOME Project.

[sindresorhus]

Can you link to some docs about it?

[mattiasb]

The project page
The git repository

[mattiasb]

The globals are fetched from the gjs repl, like this:

gjs> Object.getOwnPropertyNames( window )
undefined,Object,Function,eval,Array,Boolean,Error,InternalError,
EvalError,RangeError,ReferenceError,SyntaxError,TypeError,
URIError,Math,isNaN,isFinite,parseFloat,parseInt,NaN,Infinity,Number,
JSON,RegExp,String,escape,unescape,uneval,decodeURI,encodeURI,
decodeURIComponent,encodeURIComponent,Int8Array,Uint8Array,
Int16Array,Uint16Array,Int32Array,Uint32Array,Float32Array,Float64Array,
Uint8ClampedArray,DataView,ArrayBuffer,Iterator,StopIteration,Date,
WeakMap,Proxy,Map,Set,Reflect,Debugger,window,log,logError,print,
printerr,GjsFileImporter,imports,ARGV

[sindresorhus]

It should only include globals not already included in builtin.

[mattiasb]

Ok! Will amend tonight!

[mattiasb]

These were in builtin but not in GJS:

[
  "constructor",
  "hasOwnProperty",
  "isPrototypeOf",
  "Promise",
  "propertyIsEnumerable",
  "Symbol",
  "System",
  "toLocaleString",
  "toString",
  "valueOf",
  "WeakSet"
] 

Maybe that's okay though?

[sindresorhus]

@mattiasb That's ok. builtin includes ES2015 (ES6) too. If users only want ES5 stuff, they use the es5 field instead of builtin.

[sindresorhus]

LGTM

[sindresorhus]

@nzakas ?

[nzakas]

I'm curious, is the intent of adding these solely for use in ESLint?

The reason I ask is that 2.0.0 (hopefully out next week) supports custom environments in plugins, so it might end up being better to have these in a plugin rather than this package.

[mattiasb]

Yeah pretty much.

Is the idea to move all environments to ESLint plugins in the future? What do I gain by putting this in a plugin instead of in here? :)

[nzakas]

@mattiasb the idea is to democratize environments so that anyone can create and share an environment without having to go through a gatekeeper. It's just not sustainable for us to have to keep adding every random JavaScript environment and library globals.

[mattiasb]

That makes sense! :) Also if 2.0.0 is out around as soon as you I can just start with the latest beta.

Thanks!

[nzakas]

We are aiming to have the final 2.0.0 out either this week or next week.