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SBT JSLint Plugin

This sbt plugin simply wraps jslint4java which is a Java implementation of jslint.

You can format the jslint issues anyway you want.

Note: will only be published for sbt version >= 0.11.3.


In your project/plugins.sbt, simply add the following line:

addSbtPlugin("com.github.philcali" % "sbt-jslint" % "0.1.3")

Then, include in your build:

seq(lintSettings: _*)

SBT Settings and Tasks

jslint # Runs jslint with the options specified in jslint-flags
jslint-list-flags # Lists all the available flags
jslint-with <flag-1> <flag-n> # Runs JSlint on inputed flags
jslint-explode # Throws a build error on first issue
jslint-outputs(for jslint) # Output sequence for lint results
jslint-console-output # Outputs jslint results to console
jslint-file-output # Outputs jslint results to a file
jslint-indent(for jslint) # Spaces
jslint-max-errors(for jslint) # Issue threshold
jslint-max-length(for jslint) # Column width for javascript file
jslint-predefs(for jslint) # List of predefined javascript globals
jslint-flags(for jslint) # All the other flags for jslint
jslint-initialize(for jslint) # Builds the JSLint processor
jslint-formatter(for jslint-console-output) # Format the results in sbt
jslint-formatter(for jslint-file-output) # Format the results to a file
target(for jslint-file-output) # Output file
unmanaged-sources(for jslint) # Js files to run jslint on
include-filter(for jslint) # Run jslint on these files
exclude-filter(for jslint) # Exclude these files

Some Notes

This plugin makes no assumptions about default flags, other than the ones listed as default on jslint:

  • LintKeys.indent in LintKeys.jslint := 4
  • LintKeys.maxErrors in LintKeys.jslint := 50
  • LintKeys.maxLength in LintKeys.jslint := None
  • LintKeys.flags in LintKeys.jslint := Nil
  • LintKeys.predefs in LintKeys.jslint := Nil
  • LintKeys.explode in LintKeys.jslint := false

Because there are so many lint flags, simply add the lint flag keys to lint-flags or:

LintKeys.flags in (Compile, LintKeys.jslint) ++= Seq("browser", "on", "anon")

Use jslint-list-flags to print out a list of available flags to be included:

> jslint-list-flags
       anon     If the space may be omitted in anonymous function declarations
    bitwise     If bitwise operators should be allowed
    browser     If the standard browser globals should be predefined
        cap     If upper case html should be allowed
   continue     If the continuation statement should be tolerated
        css     If css workarounds should be tolerated
      debug     If debugger statements should be allowed
      devel     If logging should be allowed (console, alert, etc.)
       eqeq     If == should be allowed
        es5     If es5 syntax should be allowed
       evil     If eval should be allowed
      forin     If for in statements need not filter
   fragment     If html fragments should be allowed
     newcap     If constructor names capitalization is ignored
       node     If node.js globals should be predefined
      nomen     If names may have dangling _
         on     If html event handlers should be allowed
   passfail     If the scan should stop on first error
   plusplus     If increment/decrement should be allowed
 properties     If all property names must be declared with /*properties*/
     regexp     If the . should be allowed in regexp literals
      rhino     If the rhino environment globals should be predefined
     sloppy     If the 'use strict'; pragma is optional
        sub     If all forms of subscript notation are tolerated
      undef     If variables can be declared out of order
    unparam     If unused parameters should be tolerated
       vars     If multiple var statements per function should be allowed
      white     If sloppy whitespace is tolerated
     widget     If the yahoo widgets globals should be predefined
    windows     If ms windows-specific globals should be predefined

Per-run Flags

When working with jslint, you may initially want less flags as a catch all, and get more specific as you work out the obvious issues, like adding undef for files that depend on jquery. This plugin supports this work flow, with jslint-with <flag>.

The jslint-with input task auto-completes the available flag with tab. Running jslint in this manner, will load your predefined flags in jslint-flags, and your newly defined flags.

Mixing Settings

This plugin also makes no assumption about how to integrate it in your build. If you wish to apply jslint to a specific configuration, then use lintSettingsFor(configuration).

If you want jslint to be run with test, yet pulled for Compile resources. Something like that would look like this:

import sbtjslint.Plugin.LintKeys._

val settings: Seq[Setting[_]] = lintSettings ++ lintSettingsFor(Test) ++ Seq(
  unmanagedSources in (Test, jslint) <<= unmanagedSources in (Compile, jslint),
  compile in Test <<= (compile in Test).dependsOn(jslint)

Build errors

The plugin has a setting to cause build errors if a javascript file does not conform to desired standards (integration testing). The setting is aptly named explode as it does just that, giving a line number, column number, and reason.

LintKeys.explode in (Compile, jslint) := true

Note: If there is a file output defined, the file will be written, regardless of the display in the terminal. This is necessary for external applications who read these logs.

Multiple Outputs

The excellent jslint4java gives clients many ways to report the jslint results, and this plugin provides a simple way to add, change, or remove the predefined outputs. Currently, outputting the results to the console and to a file are defaults.

If you wish to only output to the console:

LintKeys.outputs in (Compile, LintKeys.jslint) ~= (_.take(1))

If you wish to only output to a file:

LintKeys.outputs in (Compile, LintKeys.jslint) ~= (_.drop(1))

A JSLintOutput is simply a Scala function that takes a JSLintResults as it's input:

LintKeys.outputs in (Compile, LintKeys.jslint) <+= (streams) map { s =>
  (results: JSLintResults) =>
  results.foreach { result =>"%s took %d millis" format (result.getName, result.getDuration))

If you want to overwrite the console output:

import LintKeys._

jslintConsoleOutput in Compile <<= (streams, formatter in (Compile, jslintConsoleOutput)) map {
  (s, f) =>
  (results: JSLintResults) =>

Custom Formatting

Currently, jslint results are outputted to a sequence of defined outputs.

By default, the console uses the PlainFormatter and the file output uses the JSLintXmlFormatter provided with the library, but these are configurable. The plugin has an additional formatter called ShortFormatter, that simply displays the issue count rather than the details.

Changing the console formatter:

import LintKeys.{
  jslint, formatter,
  jslintConsoleOutput => consoleOut

formatter in (Compile, consoleOut) <<= (sourceDirectory in jslint) (ShortFormatter)

Changing the file formatter to match the console one:

import LintKeys._

formatter in (Compile, jslintFileOutput) <<= (formatter in (Compile, jslintConsoleOutput))

The plugin provides a simple function to create a custom formatter from scratch, with the jslintFormat function.

LintKeys.formatter in (Compile, LintKeys.jslintConsoleOutput) := jslintFormat {
  result =>
  val ls = => "line %d: %s" format (i.getLine, i.getReason))