Try: Replace classnames with clsx (outdated)

.eslintrc.js

@@ -76,6 +76,11 @@ const restrictedImports = [
 		message:
 			"edit-widgets is a WordPress top level package that shouldn't be imported into other packages",
 	},
+	{
+		name: 'classnames',
+		message:
+			"Please use `clsx` instead. It's a lighter and faster drop-in replacement for `classnames`.",
+	},
 ];
 
 module.exports = {

docs/contributors/code/coding-guidelines.md

@@ -39,13 +39,13 @@ Components may be assigned with class names that indicate states (for example, a
 
 **Example:**
 
-Consider again the Notices example. We may want to apply specific styling for dismissible notices. The [`classnames` package](https://www.npmjs.com/package/classnames) can be a helpful utility for conditionally applying modifier class names.
+Consider again the Notices example. We may want to apply specific styling for dismissible notices. The [`clsx` package](https://www.npmjs.com/package/clsx) can be a helpful utility for conditionally applying modifier class names.
 
 ```jsx
-import classnames from 'classnames';
+import clsx from 'clsx';
 
 export default function Notice( { children, onRemove, isDismissible } ) {
-	const classes = classnames( 'components-notice', {
+	const classes = clsx( 'components-notice', {
 		'is-dismissible': isDismissible,
 	} );
 

packages/block-editor/package.json

@@ -65,7 +65,7 @@
 		"@wordpress/warning": "file:../warning",
 		"@wordpress/wordcount": "file:../wordcount",
 		"change-case": "^4.1.2",
-		"classnames": "^2.3.1",
+		"clsx": "^2.1.1",
 		"colord": "^2.7.0",
 		"deepmerge": "^4.3.0",
 		"diff": "^4.0.2",

packages/block-editor/src/components/block-alignment-control/ui.js

@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import classNames from 'classnames';
+import clsx from 'clsx';
 
 /**
  * WordPress dependencies
@@ -85,7 +85,7 @@ function BlockAlignmentUI( {
 												key={ controlName }
 												icon={ icon }
 												iconPosition="left"
-												className={ classNames(
+												className={ clsx(
 													'components-dropdown-menu__menu-item',
 													{
 														'is-active': isSelected,

packages/block-editor/src/components/block-card/index.js

@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import classnames from 'classnames';
+import clsx from 'clsx';
 
 /**
  * WordPress dependencies
@@ -45,7 +45,7 @@ function BlockCard( { title, icon, description, blockType, className } ) {
 	const { selectBlock } = useDispatch( blockEditorStore );
 
 	return (
-		<div className={ classnames( 'block-editor-block-card', className ) }>
+		<div className={ clsx( 'block-editor-block-card', className ) }>
 			{ parentNavBlockClientId && ( // This is only used by the Navigation block for now. It's not ideal having Navigation block specific code here.
 				<Button
 					onClick={ () => selectBlock( parentNavBlockClientId ) }

packages/block-editor/src/components/block-compare/index.js

@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import classnames from 'classnames';
+import clsx from 'clsx';
 // diff doesn't tree-shake correctly, so we import from the individual
 // module here, to avoid including too much of the library
 import { diffChars } from 'diff/lib/diff/character';
@@ -28,7 +28,7 @@ function BlockCompare( {
 		const difference = diffChars( originalContent, newContent );
 
 		return difference.map( ( item, pos ) => {
-			const classes = classnames( {
+			const classes = clsx( {
 				'block-editor-block-compare__added': item.added,
 				'block-editor-block-compare__removed': item.removed,
 			} );