eslint_d
Makes eslint the fastest linter on the planet.
"But eslint is pretty fast already, right?"
Yes, it's actually super fast. But the node.js startup time and loading all the
required modules slows down linting times for a single file to ~700
milliseconds. eslint_d
reduces this overhead by running a server in the
background. It brings the linting time down to ~160 milliseconds. If you want
to lint from within your editor whenever you save a file, eslint_d
is for
you.
Install
This will install the eslint_d
command globally:
$ npm install -g eslint_d
Usage
To start the server and lint a file, just run:
$ eslint_d file.js
On the initial call, the eslint_d
server is launched and then the given file
is linted. Subsequent invocations are super fast.
Commands
Control the server like this:
$ eslint_d <command>
Available commands:
start
: start the serverstop
: stop the serverstatus
: print out whether the server is currently runningrestart
: restart the server[options] file.js [file.js] [dir]
: invoke eslint
with the given options.
The eslint
engine will be created in the current directory. If the server
is not yet running, it is started.
Type eslint_d --help
to see the supported eslint
options.
eslint_d
will select a free port automatically and store the port number is
~/.eslint_d_port
.
Editor integration
let g:syntastic_javascript_checkers = ['eslint']
let g:syntastic_javascript_eslint_exec = 'eslint_d'
- WebStorm: Configure your IDE to point to the
eslint_d
package instead
of eslint
. In the ESLint configuration dialog, under 'ESLint package',
select your eslint_d
package. - Atom: You will not gain any performance from this module as it already
avoids starting a new node instance and uses the API directly (see this
AtomLinter issue).
If you're using eslint_d
in any other editor, please tell me!
Moar speed
If you're really into performance and want the lowest possible latency, talk to
the eslint_d
server with netcat. This will also eliminate the node.js startup
time.
$ echo '. file.js' | nc localhost `cat ~/.eslint_d_port`
This runs eslint
in under 50ms
!
Tip For additional speed, did you know that you can lint only files that
have changed? This is a feature of normal eslint
, but it also works from
eslint_d
. Run:
$ eslint_d . --cache
Compatibility
3.0.0
: eslint 2.2+1.0.0
, 2.0.0
: eslint 1.4+
License
MIT