Makes prettier fast.

Yes, it's really fast. But the node.js startup time and loading all the required modules slows down linting times for a single file to ~700 milliseconds. prettier_d_slim reduces this overhead by running a server in the background. It brings the formatting time down to ~130 milliseconds. If you want to format from within your editor whenever you save a file, prettier_d_slim is for you.

This will install the prettier_d_slim command globally:

$ npm install -g prettier_d_slim

To start the server and lint a file, just run:

# Prettier needs to know the file name to do its thing.
$ cat file.js | prettier_d_slim --stdin --stdin-filepath file.js
# Or if you already have the content of the file:
$ prettier_d_slim --stdin-filepath file.js --text 'const foo = {}'

On the initial call, the prettier_d_slim server is launched and then the given file is formatted. Subsequent invocations are super fast.

The first time you use prettier_d_slim, a little server is started in the background and bound to a random port. The port number is stored along with [a token][change401] in ~/.prettier_d_slim. You can then run prettier_d_slim commands the same way you would use prettier and it will delegate to the background server. It will load a [separate instance][change220] of prettier for each working directory to make sure settings are kept local. If prettier is found in the current working directories node_modules folder, then this version of prettier is going to be used. Otherwise, the version of prettier that ships with prettier_d_slim is used as a fallback.

To keep the memory footprint low, prettier_d_slim keeps only the last 10 used instances in the internal nanolru cache.

As far as I'm aware, all of them.

Control the server like this:

$ prettier_d_slim <command>

Available commands:

• start: start the server
• stop: stop the server
• status: print out whether the server is currently running
• restart: restart the server
• [options] file.js [file.js] [dir]: invoke prettier with the given options. The prettier engine will be created in the current directory. If the server is not yet running, it is started.

Type prettier_d_slim --help to see the supported prettier options.

prettier_d_slim will select a free port automatically and store the port number along with an access token in ~/.prettier_d_slim.

If you're really into performance and want the lowest possible latency, talk to the prettier_d_slim server with netcat. This will also eliminate the node.js startup time.

$ PORT=`cat ~/.prettier_d_slim | cut -d" " -f1`
$ TOKEN=`cat ~/.prettier_d_slim | cut -d" " -f2`
$ echo "$TOKEN $PWD file.js" | nc localhost $PORT

Or if you want to work with stdin:

$ echo "$TOKEN $PWD --stdin" | cat - file.js | nc localhost $PORT

This runs prettier in under 50ms!

If you're interested in building something similar to this: Most of the logic was extracted to core_d, a library that manages the background server.

• 1.0.0: prettier ^1.19.1

MIT