esformatter

ECMAScript code beautifier/formatter.

Live preview: lloiser/esformatter-visualize

Important

This tool is still missing support for many important features. Please report any bugs you find, the code is only as good as the test cases. Feature requests are very welcome.

We are looking for contributors!!

Why?

jsbeautifier.org doesn't have enough options and not all IDEs/Editors have a good JavaScript code formatter. I would like to have a command line tool (and standalone lib) as powerful/flexible as the WebStorm and FDT code formatters so that it can be plugged into any editor and reused by other tools like escodegen.

For more reasoning behind it and history of the project see: esformatter & rocambole

How?

This tool uses rocambole (based on Esprima) to recursively parse the tokens and transform it in place.

Goals

• granular control about white spaces, indent and line breaks.
• command line interface (cli).
• be non-destructive.
• support for local/global config file so settings can be shared between team members.
• be extensive (plugins and other cli tools).
• support most popular style guides through plugins (Google, jQuery, Idiomatic.js).
• be the best JavaScript code formatter!

API

var esformatter = require('esformatter');
var fs = require('fs');
var codeStr = fs.readFileSync('path/to/js/file.js').toString();

// for a list of available options check "lib/preset/default.json"
var options = {
  indent : {
    value : '  '
  },
  lineBreak : {
    before : {
      // at least one line break before BlockStatement
      BlockStatement : '>=1',
      // only one line break before DoWhileStatementOpeningBrace
      DoWhileStatementOpeningBrace : 1,
      // ...
    }
  },
  whiteSpace : {
    // ...
  }
};

// return a string with the formatted code
var formattedCode = esformatter.format(codeStr, options);

See the doc/api.md file for a list of all the public methods and detailed documentation about each one.

See doc/config.md for more info about the configuration options.

CLI

You can also use the simple command line interface to process the stdin or read from a file.

npm install [-g] esformatter

Usage:

esformatter [OPTIONS] [FILES]

Options:
  -c, --config   Path to custom configuration file.
  -p, --preset   Set style guide preset ("jquery", "default").
  -h, --help     Display help and usage details.
  -v, --version  Display the current version.
  --plugins      Comma separated list of plugins.
  -i             Edit input files in place; overwrite source file, use with
                 care!

Examples:

# format "test.js" and output result to stdout
esformatter test.js
# you can also pipe other shell commands (read file from stdin)
cat test.js | esformatter
# format "test.js" using options in "options.json" and output result to stdout
esformatter --config options.json test.js
# process "test.js" and writes to "test.out.js"
esformatter test.js > test.out.js
# you can override the default settings, see lib/preset/default.json for
# a list of available options
esformatter test.js --indent.value="\t" --lineBreak.before.IfStatementOpeningBrace=0
# format "test.js" and output result to "test.js"
esformatter -i test.js
# format and overwrite all the ".js" files inside the "lib/" folder
esformatter -i lib/*.js
# format and overwrite all the ".js" files inside "lib/" and it's subfolders
esformatter -i lib/**/*.js

Local version

If a locally installed esformatter is found, the CLI uses that instead of the global executable (this means you can have multiple projects depending on different versions of esformatter).

protip: add esformatter and all the plugins that you need on your project to the package.json devDependencies that way you can use locally installed plugins and also make sure everyone on your team is using the same version/settings.

{
  "devDependencies": {
    "esformatter": "~0.6.0",
    "esformatter-quotes": "^1.0.1"
  },
  "esformatter": {
    "plugins": ["esformatter-quotes"],
    "quotes": {
      "type": "single"
    }
  }
}

Configuration

See doc/config.md.

Pipe other CLI tools

Since we don't expect everyone to write plugins that only works with esformatter we decided to encourage the usage of standalone CLI tools.

{
  // pipe is a simple way to "pipe" multiple binaries input/output
  "pipe": {
    // scripts listed as "before" will be executed before esformatter
    // and will forward output to next command in the queue
    "before": [
      "strip-debug",
      "./bin/my-custom-script.sh --foo true -zx"
    ],
    // scripts listed as "after" will be executed after esformatter
    "after": [
      "baz --keepLineBreaks"
    ]
  }
}

Plugins

Plugins are automatically loaded from node_modules if you pass the module id in the config file:

{
  "plugins": [ "esformatter-sample-plugin", "foobar" ]
}

List of plugins and plugins wish list: https://github.com/millermedeiros/esformatter/wiki/Plugins

For detailed information about plugins structure and API see doc/plugins.md

IRC

We have an IRC channel #esformatter on irc.freenode.net for quick discussions about the project development/structure.

Wiki

See project Wiki for more info: https://github.com/millermedeiros/esformatter/wiki

Project structure / Contributing

See CONTRIBUTING.md

Popular Alternatives

• jsbeautifier
• codepainter
• jscs

License

Released under the MIT license