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class="theme-doc-markdown markdown"><header><h1>Configuration for Compose</h1></header><p>Relevant rule sets and their configuration options for Compose styles & usage. The following are being used as reference for Compose usage:</p> <ul> <li><a href="https://github.com/androidx/androidx/blob/androidx-main/compose/docs/compose-api-guidelines.md" target="_blank" rel="noopener noreferrer">Compose API Guidelines</a></li> <li><a href="https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose" target="_blank" rel="noopener noreferrer">Compose source</a></li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="functionnaming-for-compose">FunctionNaming for Compose<a href="#functionnaming-for-compose" class="hash-link" aria-label="Direct link to FunctionNaming for Compose" title="Direct link to FunctionNaming for Compose"></a></h3> <p>See <a href="/docs/rules/naming#functionnaming">FunctionNaming</a>.</p> <p><code>@Composable</code> functions that return <code>Unit</code> are named using <code>PascalCase</code>. detekt may see this as a violation:</p> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token annotation builtin">@Composable</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">fun</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">FooButton</span><span class="token punctuation" style="color:#393A34">(</span><span class="token plain">text</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> String</span><span class="token punctuation" style="color:#393A34">,</span><span class="token plain"> onClick</span><span class="token operator" style="color:#393A34">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token operator" style="color:#393A34">-></span><span class="token plain"> Unit</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Violation for FooButton()</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="recommended-configuration">Recommended configuration<a href="#recommended-configuration" class="hash-link" aria-label="Direct link to Recommended configuration" title="Direct link to Recommended configuration"></a></h4> <p>Choose <em>either</em> of the following options:</p> <ul> <li>Augment default <code>functionPattern</code> to <code>'[a-zA-Z][a-zA-Z0-9]*'</code> (default is: <code>'[a-z][a-zA-Z0-9]*'</code>)</li> <li>Set <code>ignoreAnnotated</code> to <code>['Composable']</code></li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="toplevelpropertynaming-for-compose">TopLevelPropertyNaming for Compose<a href="#toplevelpropertynaming-for-compose" class="hash-link" aria-label="Direct link to TopLevelPropertyNaming for Compose" title="Direct link to TopLevelPropertyNaming for Compose"></a></h3> <p>See <a href="/docs/rules/naming#toplevelpropertynaming">TopLevelPropertyNaming</a>.</p> <p>Compose guidelines prescribe <code>PascalCase</code> for top-level constants.</p> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="default-style">Default Style:<a href="#default-style" class="hash-link" aria-label="Direct link to Default Style:" title="Direct link to Default Style:"></a></h5> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">private</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">val</span><span class="token plain"> FOO_PADDING </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">16</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">dp</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <h5 class="anchor anchorWithStickyNavbar_LWe7" id="compose-style">Compose Style:<a href="#compose-style" class="hash-link" aria-label="Direct link to Compose Style:" title="Direct link to Compose Style:"></a></h5> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">private</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">val</span><span class="token plain"> FooPadding </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token number" style="color:#36acaa">16</span><span class="token punctuation" style="color:#393A34">.</span><span class="token plain">dp</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="recommended-configuration-1">Recommended configuration<a href="#recommended-configuration-1" class="hash-link" aria-label="Direct link to Recommended configuration" title="Direct link to Recommended configuration"></a></h4> <ul> <li>Set <code>constantPattern</code> to <code>'[A-Z][A-Za-z0-9]*'</code> (default is: <code>'[A-Z][_A-Z0-9]*'</code>)</li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="longparameterlist-for-compose">LongParameterList for Compose<a href="#longparameterlist-for-compose" class="hash-link" aria-label="Direct link to LongParameterList for Compose" title="Direct link to LongParameterList for Compose"></a></h3> <p>See <a href="/docs/rules/complexity#longparameterlist">LongParameterList</a>.</p> <p>Composables may boast more than the typical number of function arguments (albeit mostly with default values). For example, see <a href="https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/material/material/src/commonMain/kotlin/androidx/compose/material/OutlinedTextField.kt;l=133?q=OutlinedTextFieldLayout&ss=androidx%2Fplatform%2Fframeworks%2Fsupport:compose%2F" target="_blank" rel="noopener noreferrer">OutlinedTextField</a>.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="recommended-configuration-2">Recommended configuration<a href="#recommended-configuration-2" class="hash-link" aria-label="Direct link to Recommended configuration" title="Direct link to Recommended configuration"></a></h4> <ul> <li>Set <code>functionThreshold</code> to a higher value</li> <li>Additionally, can set <code>ignoreDefaultParameters = true</code></li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="magicnumber-for-compose">MagicNumber for Compose<a href="#magicnumber-for-compose" class="hash-link" aria-label="Direct link to MagicNumber for Compose" title="Direct link to MagicNumber for Compose"></a></h3> <p>See <a href="/docs/rules/style#magicnumber">MagicNumber</a>.</p> <p>Class/companion object/top-level properties that declare objects such as <code>Color(0xFFEA6D7E)</code> may be considered violations if they don't specify the named parameter (i.e. <code>Color(color = 0xFFEA6D7E)</code>).</p> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token keyword" style="color:#00009f">val</span><span class="token plain"> color1 </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">Color</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">0xFFEA6D7E</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Violation</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">class</span><span class="token plain"> Foo </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">val</span><span class="token plain"> color2 </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">Color</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">0xFFEA6D7E</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Violation</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">companion</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">object</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token keyword" style="color:#00009f">val</span><span class="token plain"> color3 </span><span class="token operator" style="color:#393A34">=</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">Color</span><span class="token punctuation" style="color:#393A34">(</span><span class="token number" style="color:#36acaa">0xFFEA6D7E</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// No violation if ignoreCompanionObjectPropertyDeclaration = true by default</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="recommended-configuration-3">Recommended configuration<a href="#recommended-configuration-3" class="hash-link" aria-label="Direct link to Recommended configuration" title="Direct link to Recommended configuration"></a></h4> <ul> <li>Set <code>ignorePropertyDeclaration = true</code>, <code>ignoreCompanionObjectPropertyDeclaration = true</code> (default)</li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="unusedprivatemember-for-compose">UnusedPrivateMember for Compose<a href="#unusedprivatemember-for-compose" class="hash-link" aria-label="Direct link to UnusedPrivateMember for Compose" title="Direct link to UnusedPrivateMember for Compose"></a></h3> <p>See <a href="/docs/rules/style#unusedprivatemember">UnusedPrivateMember</a>.</p> <p>detekt may see composable preview functions, i.e. those marked with <code>@Preview</code>, as unused.</p> <div class="language-kotlin codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-kotlin codeBlock_bY9V thin-scrollbar" style="color:#393A34;background-color:#f6f8fa"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#393A34"><span class="token annotation builtin">@Preview</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token annotation builtin">@Composable</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token keyword" style="color:#00009f">private</span><span class="token plain"> </span><span class="token keyword" style="color:#00009f">fun</span><span class="token plain"> </span><span class="token function" style="color:#d73a49">FooLazyColumnPreview</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#393A34">{</span><span class="token plain"> </span><span class="token comment" style="color:#999988;font-style:italic">// Violation for FooLazyColumnPreview()</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"> </span><span class="token function" style="color:#d73a49">FooLazyColumn</span><span class="token punctuation" style="color:#393A34">(</span><span class="token punctuation" style="color:#393A34">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"></span><span class="token punctuation" style="color:#393A34">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="recommended-configuration-4">Recommended configuration<a href="#recommended-configuration-4" class="hash-link" aria-label="Direct link to Recommended configuration" title="Direct link to Recommended configuration"></a></h4> <ul> <li>Set <code>ignoreAnnotated</code> to <code>['Preview']</code></li> </ul> <h3 class="anchor anchorWithStickyNavbar_LWe7" id="toomanyfunctions-for-compose">TooManyFunctions for Compose<a href="#toomanyfunctions-for-compose" class="hash-link" aria-label="Direct link to TooManyFunctions for Compose" title="Direct link to TooManyFunctions for Compose"></a></h3> <p>See <a href="/docs/rules/complexity/#toomanyfunctions">TooManyFunctions</a>.</p> <p>detekt may flag files with many composable preview functions, i.e. those marked with <code>@Preview</code>, as having too many functions. Since preview functions do not contribute to complexity, this might not be desired.</p> <h4 class="anchor anchorWithStickyNavbar_LWe7" id="recommended-configuration-5">Recommended configuration<a href="#recommended-configuration-5" class="hash-link" aria-label="Direct link to Recommended configuration" title="Direct link to Recommended configuration"></a></h4> <ul> <li>Set <code>ignoreAnnotatedFunctions</code> to <code>['Preview']</code></li> </ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col"><a href="https://github.com/detekt/detekt/edit/main/website/versioned_docs/version-1.23.8/introduction/compose.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 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