diff --git a/better-code-editing.php b/better-code-editing.php
index 72732d6..b614bb8 100644
--- a/better-code-editing.php
+++ b/better-code-editing.php
@@ -40,13 +40,42 @@ class Better_Code_Editing_Plugin {
 		),
 		'csslint' => array(
 			'rules' => array(
-				'errors', // Parsing errors.
-				'box-model',
-				'display-property-grouping',
-				'duplicate-properties',
-				'empty-rules',
-				'known-properties',
-				'outline-none',
+				'errors' => true, // Parsing errors.
+				'box-model' => true,
+				'display-property-grouping' => true,
+				'duplicate-properties' => true,
+				'empty-rules' => true,
+				'known-properties' => true,
+				'outline-none' => true,
+			),
+		),
+		'jshint' => array(
+			'rules' => array(
+				// The following are copied from <https://github.com/WordPress/wordpress-develop/blob/4.8.1/.jshintrc>.
+				'boss' => true,
+				'curly' => true,
+				'eqeqeq' => true,
+				'eqnull' => true,
+				'es3' => true,
+				'expr' => true,
+				'immed' => true,
+				'noarg' => true,
+				'nonbsp' => true,
+				'onevar' => true,
+				'quotmark' => 'single',
+				'trailing' => true,
+				'undef' => true,
+				'unused' => true,
+
+				'browser' => true,
+
+				'globals' => array(
+					'_' => false,
+					'Backbone' => false,
+					'jQuery' => false,
+					'JSON' => false,
+					'wp' => false,
+				),
 			),
 		),
 	);
@@ -84,8 +113,8 @@ public static function register_scripts( WP_Scripts $scripts ) {
 		$scripts->add( 'codemirror-addon-hint-xml',        plugins_url( 'wp-includes/js/codemirror/addon/hint/xml-hint.js', __FILE__ ),        array( 'codemirror-addon-hint-show', 'codemirror-mode-xml' ), self::CODEMIRROR_VERSION );
 
 		// The linting engines for the lint addons...
-		$scripts->add( 'csslint',  plugins_url( 'wp-includes/js/csslint.js', __FILE__ ), array(), self::VERSION );
-		$scripts->add( 'htmlhint', plugins_url( 'wp-includes/js/htmlhint.js', __FILE__ ), array(), self::VERSION );
+		$scripts->add( 'csslint',  plugins_url( 'wp-includes/js/csslint.js', __FILE__ ), array(), self::VERSION ); // @todo Version like '1.0.3'.
+		$scripts->add( 'htmlhint', plugins_url( 'wp-includes/js/htmlhint.js', __FILE__ ), array(), self::VERSION ); // @todo Version like '0.9.13'.
 		$scripts->add( 'jshint',   plugins_url( 'wp-includes/js/jshint.js', __FILE__ ), array(), self::VERSION );
 		$scripts->add( 'jsonlint', plugins_url( 'wp-includes/js/jsonlint.js', __FILE__ ), array(), self::VERSION );
 
@@ -258,10 +287,10 @@ public static function enqueue_assets( $settings ) {
 					}
 					break;
 				case 'text/javascript':
-					wp_enqueue_script( 'jshint' );
 					wp_enqueue_script( 'codemirror-mode-javascript' );
 
 					if ( ! empty( $settings['codemirror']['lint'] ) ) {
+						wp_enqueue_script( 'jshint' );
 						wp_enqueue_script( 'codemirror-addon-lint-javascript' );
 					}
 					break;
diff --git a/wp-admin/js/code-editor.js b/wp-admin/js/code-editor.js
index 10d8177..84ec428 100644
--- a/wp-admin/js/code-editor.js
+++ b/wp-admin/js/code-editor.js
@@ -40,7 +40,7 @@ if ( 'undefined' === typeof window.wp.codeEditor ) {
 		var allRules = CSSLint.getRules(), i;
 		CSSLint.clearRules();
 		for ( i = 0; i < allRules.length; i++ ) {
-			if ( -1 !== rules.indexOf( allRules[ i ].id ) ) {
+			if ( rules[ allRules[ i ].id ] ) {
 				CSSLint.addRule( allRules[ i ] );
 			}
 		}
@@ -64,9 +64,19 @@ if ( 'undefined' === typeof window.wp.codeEditor ) {
 		}
 
 		instanceSettings = $.extend( {}, wp.codeEditor.defaultSettings, settings );
+		instanceSettings.codemirror = $.extend( {}, instanceSettings.codemirror );
 
-		if ( 'undefined' !== typeof CSSLint && instanceSettings.csslint && instanceSettings.csslint.rules ) {
-			updateCSSLintRules( instanceSettings.csslint.rules );
+		if ( true === instanceSettings.codemirror.lint ) {
+
+			// Configure JSHint.
+			if ( 'text/javascript' === instanceSettings.codemirror.mode && true === instanceSettings.codemirror.lint && instanceSettings.jshint && instanceSettings.jshint.rules ) {
+				instanceSettings.codemirror.lint = instanceSettings.jshint.rules;
+			}
+
+			// Configure CSSLint.
+			if ( 'undefined' !== typeof CSSLint && instanceSettings.csslint && instanceSettings.csslint.rules ) {
+				updateCSSLintRules( instanceSettings.csslint.rules );
+			}
 		}
 
 		editor = CodeMirror.fromTextArea( $textarea[0], instanceSettings.codemirror );