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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="description" content="An anti-bikeshedding Kotlin linter with built-in formatter.">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">
<title>ktlint</title>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:regular,bold,thin,light,black,medium&lang=en">
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.6.0/themes/prism.min.css">
<link rel="stylesheet" href="https://code.getmdl.io/1.3.0/material.min.css">
<link rel="stylesheet" href="index.css">
</head>
<body>
<div class="mdl-layout mdl-js-layout mdl-layout--fixed-header docs-layout mdl-layout--no-desktop-drawer-button">
<!-- header -->
<div class="ktlint-header mdl-layout__header mdl-layout__header--waterfall mdl-layout__header--waterfall-hide-top">
<div class="mdl-layout__header-row">
<span class="ktlint-pn ktlint-title mdl-layout-title">ktlint</span>
<div class="ktlint-header-spacer mdl-layout-spacer"></div>
<div class="ktlint-navigation-container">
<nav class="ktlint-navigation mdl-navigation">
<a class="mdl-navigation__link mdl-typography--text-uppercase" href="#getting-started">Getting Started</a>
<a class="mdl-navigation__link mdl-typography--text-uppercase" href="#rules">Rules</a>
<a class="mdl-navigation__link mdl-typography--text-uppercase" href="#faq">FAQ</a>
<a class="mdl-navigation__link mdl-typography--text-uppercase" href="https://github.com/pinterest/ktlint">GitHub</a>
</nav>
</div>
</div>
</div>
<!-- header/drawer -->
<div class="ktlint-drawer mdl-layout__drawer">
<nav class="mdl-navigation">
<a class="mdl-navigation__link" href="#getting-started">Getting Started</a>
<a class="mdl-navigation__link" href="#rules">Rules</a>
<a class="mdl-navigation__link" href="#faq">FAQ</a>
<a class="mdl-navigation__link" href="https://github.com/pinterest/ktlint">GitHub</a>
</nav>
</div>
<!-- welcome -->
<div class="mdl-layout__content">
<a name="top"></a>
<div class="ktlint-be-together-section mdl-typography--text-center">
<div class="logo-font ktlint-slogan">
<span class="ktlint-pn ktlint-slogn--box">ktlint</span>
</div>
<div class="logo-font ktlint-sub-slogan">An anti-bikeshedding Kotlin linter with built-in formatter.</div>
</div>
<!-- getting-started -->
<div id="getting-started" class="ktlint-screen-section getting-started-section mdl-typography--text-center">
<div class="mdl-typography--display-1-color-contrast ktlint-category">Getting Started</div>
<div class="ktlint-content">
<div class="mdl-tabs mdl-js-tabs mdl-js-ripple-effect">
<!-- getting-started/tabs -->
<div class="mdl-tabs__tab-bar ktlint-getting-started">
<a href="#command-line" class="mdl-tabs__tab is-active">Command Line</a>
<a href="#maven" class="mdl-tabs__tab">Maven</a>
<a href="#gradle" class="mdl-tabs__tab">Gradle</a>
</div>
<!-- getting-started/command-line tab -->
<div class="mdl-tabs__panel is-active mdl-typography--text-left" id="command-line">
<h2 class="mdl-typography--headline mdl-typography--subhead">Installation</h2>
<div class="snippet-code">
<pre><code class=" language-bash">curl -sSLO https://github.com/pinterest/ktlint/releases/download/0.47.1/ktlint && chmod a+x ktlint
# you can also download ktlint manually from https://github.com/pinterest/ktlint/releases
# another option is "brew install ktlint"
# verify PGP signature (optional but recommended)
curl -sS https://keybase.io/ktlint/pgp_keys.asc | gpg --import
curl -sSLO https://github.com/pinterest/ktlint/releases/download/0.47.1/ktlint.asc
gpg --verify ktlint.asc</code></pre>
</div>
<h2 class="mdl-typography--headline mdl-typography--subhead">Usage</h2>
<div class="snippet-code">
<pre><code class=" language-bash"># check the style of all Kotlin files inside the current dir (recursively)
# (hidden folders will be skipped)
$ ktlint
src/main/kotlin/Main.kt:10:10: Unused import
# check only certain locations (prepend ! to negate the pattern)
$ ktlint "src/**/*.kt" "!src/**/*Test.kt"
# auto-correct style violations
# (if some errors cannot be fixed automatically they will be printed to stderr)
$ ktlint -F "src/**/*.kt"
# print style violations grouped by file
$ ktlint --reporter=plain?group_by_file
# print style violations as usual + create report in checkstyle format
$ ktlint --reporter=plain --reporter=checkstyle,output=ktlint-report-in-checkstyle-format.xml
# install git hook to automatically check files for style violations on commit
$ ktlint --install-git-pre-commit-hook</code></pre>
</div>
</div>
<!-- getting-started/maven tab -->
<div class="mdl-tabs__panel mdl-typography--text-left" id="maven">
<h2 class="mdl-typography--headline mdl-typography--subhead">Integration</h2>
<p>Add the following snippet to pom.xml (inside <span style="color: slategray"><build><plugins>...</plugins></build></span>)
<div class="snippet-code">
<pre><code class=" language-markup"><plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<id>ktlint</id>
<phase>verify</phase>
<configuration>
<target name="ktlint">
<java taskname="ktlint" dir="${basedir}" fork="true" failonerror="true"
classname="com.pinterest.ktlint.Main" classpathref="maven.plugin.classpath">
<arg value="src/**/*.kt"/>
<!-- to generate report in checkstyle format prepend following args: -->
<!--
<arg value="--reporter=plain"/>
<arg value="--reporter=checkstyle,output=${project.build.directory}/ktlint.xml"/>
-->
<!-- see https://github.com/pinterest/ktlint#usage for more -->
</java>
</target>
</configuration>
<goals><goal>run</goal></goals>
</execution>
<execution>
<id>ktlint-format</id>
<configuration>
<target name="ktlint">
<java taskname="ktlint" dir="${basedir}" fork="true" failonerror="true"
classname="com.pinterest.ktlint.Main" classpathref="maven.plugin.classpath">
<arg value="-F"/>
<arg value="src/**/*.kt"/>
</java>
</target>
</configuration>
<goals><goal>run</goal></goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>com.pinterest</groupId>
<artifactId>ktlint</artifactId>
<version>0.43.1</version>
</dependency>
<!-- additional 3rd party ruleset(s) can be specified here -->
</dependencies>
</plugin></code></pre>
</div>
<h2 class="mdl-typography--headline mdl-typography--subhead">Usage</h2>
<div class="snippet-code">
<pre><code class=" language-bash"># check code style (it's also bound to "mvn verify")
$ mvn antrun:run@ktlint
src/main/kotlin/Main.kt:10:10: Unused import
# fix code style deviations (runs built-in formatter)
$ mvn antrun:run@ktlint-format</code></pre>
</div>
</div>
<!-- getting-started/gradle tab -->
<div class="mdl-tabs__panel mdl-typography--text-left" id="gradle">
<h2 class="mdl-typography--headline mdl-typography--subhead">Integration</h2>
<h2 class="mdl-typography--headline mdl-typography--subhead">Plugins (Recommended)</h2>
<p>There are few community-driven plugins (in order of appearance):
<ul class="mdl-list gradle-thirdparty-list">
<li class="mdl-list__item mdl-list__item--two-line">
<span class="mdl-list__item-primary-content">
<span><a href="https://github.com/jlleitschuh/ktlint-gradle">jlleitschuh/ktlint-gradle</a></span>
<span class="mdl-list__item-sub-title">
Gradle plugin that automatically creates check and format tasks for project Kotlin sources,
supports different kotlin plugins and Gradle build caching.
</span>
</span>
</li>
<li class="mdl-list__item mdl-list__item--two-line">
<span class="mdl-list__item-primary-content">
<span><a href="https://github.com/jeremymailen/kotlinter-gradle">jeremymailen/kotlinter-gradle</a></span>
<span class="mdl-list__item-sub-title">
Gradle plugin featuring incremental build support, file reports, .kt & .kts source support.
</span>
</span>
</li>
<li class="mdl-list__item mdl-list__item--two-line">
<span class="mdl-list__item-primary-content">
<span><a href="https://github.com/diffplug/spotless/tree/master/plugin-gradle#applying-ktlint-to-kotlin-files">diffplug/spotless</a></span>
<span class="mdl-list__item-sub-title">
Spotless is not really a plugin, it's a standalone project that happens to have a built-in ktlint support.
In addition to linting/formatting kotlin code it allows you to keep license headers, markdown documentation, etc. in check.
</span>
</span>
</li>
</ul>
<h2 class="mdl-typography--headline mdl-typography--subhead">Without Plugins</h2>
<p>Add the following snippet to build.gradle
<div class="snippet-code">
<pre><code class=" language-groovy">apply plugin: "java"
repositories {
jcenter()
}
configurations {
ktlint
}
dependencies {
ktlint "com.pinterest:ktlint:0.43.1"
// additional 3rd party ruleset(s) can be specified here
// just add them to the classpath (ktlint 'groupId:artifactId:version') and
// ktlint will pick them up
}
task ktlint(type: JavaExec, group: "verification") {
description = "Check Kotlin code style."
main = "com.pinterest.ktlint.Main"
classpath = configurations.ktlint
args "src/**/*.kt"
// to generate report in checkstyle format prepend following args:
// "--reporter=plain", "--reporter=checkstyle,output=${buildDir}/ktlint.xml"
// see https://github.com/pinterest/ktlint#usage for more
}
check.dependsOn ktlint
task ktlintFormat(type: JavaExec, group: "formatting") {
description = "Fix Kotlin code style deviations."
main = "com.pinterest.ktlint.Main"
classpath = configurations.ktlint
args "-F", "src/**/*.kt"
}</code></pre>
</div>
<h4 class="mdl-typography--headline mdl-typography--subhead">Usage</h4>
<div class="snippet-code">
<pre><code class=" language-bash"># check code style (it's also bound to "gradle check")
$ gradle ktlint
src/main/kotlin/Main.kt:10:10: Unused import
# fix code style deviations (runs built-in formatter)
$ gradle ktlintFormat</code></pre>
</div>
</div>
</div>
</div>
</div>
<!-- rules -->
<div id="rules" class="ktlint-screen-section">
<div class="mdl-typography--display-1-color-contrast mdl-typography--text-center ktlint-category">Rules</div>
<div class="ktlint-content">
<section id="rule-indentation">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-indentation">4 spaces for indentation*.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">data class C(
val a: Any,
val b: Any = 0,
val c: Any
) {}
</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">data class C(val a: Any,
val b: Any = 0,
val c: Any) {
}</code></pre>
</div>
<p style="font-size: 14px; text-align: left; color: slategray;">
* Starting from <a href="https://github.com/shyiko/ktlint/releases/tag/0.8.0">0.8.0</a> value of indent_size specified under
[*{kt,kts}] section in <a href="http://editorconfig.org/">.editorconfig</a> takes precedence (if any).
Official recommendation is to use 4 spaces, though. (see <a href="https://github.com/shyiko/ktlint/issues/43#issuecomment-304953280">#43</a> for details)
</p>
</div>
</div>
</section>
<section id="rule-semi">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-semi">No semicolons.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">val v = ""
println(v)
// semicolons used to separate multiple statements on the same line are OK
// try avoid though
fn({ v -> println(v); v * 10 })</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">val v = "";
println(v);</code></pre>
</div>
</div>
</div>
</section>
<section id="rule-import">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-import">No wildcard / unused imports.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">import io.vertx.core.Vertx
import com.google.Guice
import com.google.Injector</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">import io.vertx.core.*
import com.google.inject.*
import pkg.UnusedClass
</code></pre>
</div>
</div>
</div>
</section>
<section id="rule-blank">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-blank">No consecutive blank lines.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">class A {}
class B {}
</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">// this in not a Python and you are not in PEP 8 realm
class A {}
class B {}
</code></pre>
</div>
</div>
</div>
</section>
<section id="rule-trailing-whitespaces">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-trailing-whitespaces">No trailing whitespaces.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">class A {}
class B {}</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">class A {}⋅⋅⋅
class B {}⋅</code></pre>
</div>
<p style="font-size: 14px; text-align: left; color: slategray;">
* If you don't use <a href="http://editorconfig.org/#download">EditorConfig</a> it's a good time to start.
</p>
</div>
</div>
</section>
<section id="rule-unit-return">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-unit-return">No Unit returns.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">fun f() {}</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">fun f(): Unit {}</code></pre>
</div>
</div>
</div>
</section>
<section id="rule-unit-return">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-empty-class-body">No empty class bodies.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">class A
interface B</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">class A {}
interface B {}</code></pre>
</div>
</div>
</div>
</section>
<section id="rule-unit-return">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-string-template">Consistent string templates.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">val a = "class = ${String::class}"
val b = "not $a"</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">val a = "class = ${String::class.toString()}"
val b = "not ${a}"</code></pre>
</div>
</div>
</div>
</section>
<section id="rule-modifier-order">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-modifier-order">Consistent order of modifiers.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">internal abstract class A {
protected open val v = ""
internal open suspend fun f(v: Any): Any = ""
public lateinit var lv: String
abstract tailrec fun findFixPoint(x: Double = 1.0): Double
}
class B : A() {
public override val v = ""
suspend override fun f(v: Any): Any = ""
tailrec override fun findFixPoint(x: Double): Double
= if (x == Math.cos(x)) x else findFixPoint(Math.cos(x))
}</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">abstract internal class A {
open protected val v = ""
open suspend internal fun f(v: Any): Any = ""
lateinit public var lv: String
tailrec abstract fun findFixPoint(x: Double = 1.0): Double
}
class B : A() {
override public val v = ""
override suspend fun f(v: Any): Any = ""
override tailrec fun findFixPoint(x: Double): Double
= if (x == Math.cos(x)) x else findFixPoint(Math.cos(x))
}</code></pre>
</div>
</div>
</div>
</section>
<section id="rule-spacing">
<div class="mdl-grid">
<div class="mdl-cell mdl-cell--2-col mdl-cell--12-col-phone">
<h3><a href="#rule-spacing">Consistent spacing.</a></h3>
</div>
<div class="mdl-cell mdl-cell--10-col mdl-cell--12-col-phone">
<div class="snippet-header snippet-good">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Do.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-good">
<pre><code class="language-kotlin">val short = ""
val long = ""
val v = a - b * c
class A : B, C {}
if (true) {}
@file:JvmName("Main")
class A : B
call(object : C() {})
fun fn(@field:F a: Any, b: Any, c: Any): Any
val v: String = str()
if (ok) { /* .. */ }
fn({ v -> f(v) * g(v) })
emptyList<String>().find { true }!!.hashCode()
find { it.default ?: false }?.phone</code></pre>
</div>
<div class="snippet-header snippet-bad">
<div class="snippet-captions">
<div class="snippet-caption">
<span class="snippet-hint">Don't.</span>
</div>
</div>
</div>
<div class="snippet-code snipper-code-bad">
<pre><code class="language-kotlin">// multiple spaces after "val long" for vertical alignment
val short = ""
val long = ""
// no spacing around operators
val v=a-b*c
// no space after the comma
class A : B,C {}
// no spacing after keyword ("if" in this case)
if(true) {}
// incorrect spacing around ":"
@file: JvmName("Main")
class A:B
call(object: C() {})
fun fn(@field: F a:Any, b:Any, c:Any):Any
val v:String = str()
// missing spacing around "{" and before "}"
if (true){/* .. */}
// missing spacing after "{" and before "}"
fn({v -> f(v) * g(v)}!!)
// unnecessary space after "}"
emptyList<String>().find { true } !!.hashCode()
find { it.default ?: false } ?.phone</code></pre>
</div>
</div>
</div>
</section>
</div>
</div>
<!-- faq -->
<div id="faq" class="ktlint-screen-section faq-section">
<div class="mdl-typography--display-1-color-contrast mdl-typography--text-center ktlint-category">FAQ</div>
<div class="ktlint-content">
<!-- faq/why -->
<h2 id="faq-why" class="faq-q mdl-typography--headline mdl-typography--subhead"><i class="material-icons faq-icon">fiber_manual_record</i><a class="faq-q--link" href="#faq-why">Why should I use ktlint?</a></h2>
<div class="faq-a">
<p>
<strong>Simplicity</strong>.
<p>Spending time on configuration (& maintenance down the road) of hundred-line long style config file(s) is counter-productive.
Instead of wasting your energy on something that has no business value - focus on what really matters (not debating whether to use
tabs or spaces).
<p>By using ktlint you put the importance of code clarity and community conventions over personal preferences.
This makes things easier for people reading your code as well as frees you from having to document &
explain what style potential contributor(s) have to follow.
<p>ktlint is a single binary with both linter & formatter included. All you need is to drop it in (no need to
get <a href="https://en.wikipedia.org/wiki/decision_fatigue">overwhelmed</a> while choosing
among <a href="http://checkstyle.sourceforge.net/checks.html">dozens of code style options</a>).
</div>
<!-- faq/ruleset -->
<h2 id="faq-ruleset" class="faq-q mdl-typography--headline mdl-typography--subhead"><i class="material-icons faq-icon">fiber_manual_record</i><a class="faq-q--link" href="#faq-ruleset">Can I have my own rules on top of ktlint?</a></h2>
<div class="faq-a">
<p>Absolutely, "no configuration" doesn't mean "no extensibility". You can add your own ruleset(s) to discover potential bugs, check for anti-patterns, etc.
<p>See <a href="https://github.com/pinterest/ktlint#creating-a-ruleset">Creating A Ruleset</a> on GitHub.
</div>
<!-- faq/error-suppression -->
<h2 id="faq-error-suppression" class="faq-q mdl-typography--headline mdl-typography--subhead"><i class="material-icons faq-icon">fiber_manual_record</i><a class="faq-q--link" href="#faq-error-suppression">How do I suppress an error?</a></h2>
<div class="faq-a">
<p style="color: slategray;">
This is meant primarily as an escape latch for the rare cases when ktlint is not able to produce the correct result (please report any such instances using <a href="https://github.com/pinterest/ktlint/issues">GitHub Issues</a>).
<p>To disable a specific rule you'll need to turn on the verbose mode (ktlint --verbose ...). At the end of each line you'll see an error code. Use it as an argument for ktlint-disable directive (shown below).
<div class="snippet-code">
<pre><code class="language-kotlin">import package.* // ktlint-disable no-wildcard-imports
/* ktlint-disable no-wildcard-imports */
import package.a.*
import package.b.*
/* ktlint-enable no-wildcard-imports */</code></pre>
</div>
<p>To disable all checks:
<div class="snippet-code">
<pre><code class="language-kotlin">import package.* // ktlint-disable</code></pre>
</div>
</div>
<!-- faq/globally-disable -->
<h2 id="faq-/globally-disable" class="faq-q mdl-typography--headline mdl-typography--subhead"><i class="material-icons faq-icon">fiber_manual_record</i><a class="faq-q--link" href="#faq-globally-disable">How do I globally disable a rule?</a></h2>
<div class="faq-a">
<p>See the <a href="https://github.com/pinterest/ktlint#editorconfig">EditorConfig</a> section on GitHub. You may also use the --disabled_rules command line flag.
</div>
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