diff --git a/.eslintrc.json b/.eslintrc.json
index f6ccf368..a4a29b28 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,12 +1,11 @@
 {
-	"extends": "wikimedia",
-	"env": {
-		"browser": true
-	},
+	"extends": [
+		"wikimedia/client",
+		"wikimedia/jquery"
+	],
 	"globals": {
 		"OO": false,
-		"mw": false,
-		"$": false
+		"mw": false
 	},
 	"rules": {
 		"valid-jsdoc": 0,
diff --git a/modules/ext.templateDataGenerator.data.js b/modules/ext.templateDataGenerator.data.js
index ab917c8e..a564ec36 100644
--- a/modules/ext.templateDataGenerator.data.js
+++ b/modules/ext.templateDataGenerator.data.js
@@ -217,8 +217,8 @@ mw.TemplateData.Model.static.splitAndTrimArray = function ( str, delim ) {
 	var arr = [];
 	delim = delim || mw.msg( 'comma-separator' );
 
-	$.each( str.split( delim ), function () {
-		var trimmed = $.trim( this );
+	str.split( delim ).forEach( function ( part ) {
+		var trimmed = part.trim();
 		if ( trimmed ) {
 			arr.push( trimmed );
 		}
@@ -239,7 +239,7 @@ mw.TemplateData.Model.static.arrayUnionWithoutEmpty = function () {
 
 	// Trim and filter empty strings
 	return result.filter( function ( i ) {
-		return $.trim( i );
+		return i.trim();
 	} );
 };
 
@@ -299,7 +299,7 @@ mw.TemplateData.Model.prototype.getMissingParams = function () {
 
 	// Check source code params
 	for ( i = 0; i < this.sourceCodeParameters.length; i++ ) {
-		if ( $.inArray( this.sourceCodeParameters[ i ], allParamNames ) === -1 ) {
+		if ( allParamNames.indexOf( this.sourceCodeParameters[ i ] ) === -1 ) {
 			result.push( this.sourceCodeParameters[ i ] );
 		}
 	}
@@ -321,7 +321,7 @@ mw.TemplateData.Model.prototype.importSourceCodeParameters = function () {
 	// Check existing params
 	for ( i = 0; i < allParamNames.length; i++ ) {
 		paramKey = allParamNames[ i ];
-		if ( $.inArray( paramKey, this.sourceCodeParameters ) !== -1 ) {
+		if ( this.sourceCodeParameters.indexOf( paramKey ) !== -1 ) {
 			existingArray.push( paramKey );
 		}
 	}
@@ -329,7 +329,7 @@ mw.TemplateData.Model.prototype.importSourceCodeParameters = function () {
 	// Add sourceCodeParameters to the model
 	for ( i = 0; i < this.sourceCodeParameters.length; i++ ) {
 		if (
-			$.inArray( this.sourceCodeParameters[ i ], existingArray ) === -1 &&
+			existingArray.indexOf( this.sourceCodeParameters[ i ] ) === -1 &&
 			this.addParam( this.sourceCodeParameters[ i ] )
 		) {
 			importedArray.push( this.sourceCodeParameters[ i ] );
@@ -371,7 +371,7 @@ mw.TemplateData.Model.prototype.getExistingLanguageCodes = function () {
 	for ( param in this.params ) {
 		// Go over the properties
 		for ( prop in this.params[ param ] ) {
-			if ( $.inArray( prop, languageProps ) !== -1 ) {
+			if ( languageProps.indexOf( prop ) !== -1 ) {
 				result = this.constructor.static.arrayUnionWithoutEmpty( result, Object.keys( this.params[ param ][ prop ] ) );
 			}
 		}
@@ -399,7 +399,7 @@ mw.TemplateData.Model.prototype.addParam = function ( key, paramData ) {
 
 	name = key;
 	// Check that the parameter is not already in the model
-	if ( this.params[ key ] || $.inArray( key, existingNames ) !== -1 ) {
+	if ( this.params[ key ] || existingNames.indexOf( key ) !== -1 ) {
 		// Change parameter key
 		key = this.getNewValidParameterKey( key );
 	}
@@ -411,7 +411,7 @@ mw.TemplateData.Model.prototype.addParam = function ( key, paramData ) {
 	this.params[ key ].name = name;
 
 	// Mark the parameter if it is in the template source
-	if ( $.inArray( key, this.sourceCodeParameters ) !== -1 ) {
+	if ( this.sourceCodeParameters.indexOf( key ) !== -1 ) {
 		this.params[ key ].inSource = true;
 	}
 
@@ -451,7 +451,7 @@ mw.TemplateData.Model.prototype.addParam = function ( key, paramData ) {
 			}
 
 			if (
-				$.inArray( propToSet, propertiesWithLanguage ) !== -1 &&
+				propertiesWithLanguage.indexOf( propToSet ) !== -1 &&
 				$.isPlainObject( data[ prop ] )
 			) {
 				// Add all language properties
@@ -592,7 +592,7 @@ mw.TemplateData.Model.prototype.setTemplateFormat = function ( format ) {
  * @fires change
  */
 mw.TemplateData.Model.prototype.addKeyTemplateParamOrder = function ( key ) {
-	if ( $.inArray( key, this.paramOrder ) === -1 ) {
+	if ( this.paramOrder.indexOf( key ) === -1 ) {
 		this.paramOrder.push( key );
 		this.emit( 'add-paramOrder', key );
 		this.emit( 'change' );
@@ -629,7 +629,7 @@ mw.TemplateData.Model.prototype.reorderParamOrderKey = function ( key, newIndex
  * @fires change
  */
 mw.TemplateData.Model.prototype.removeKeyTemplateParamOrder = function ( key ) {
-	var keyPos = $.inArray( key, this.paramOrder );
+	var keyPos = this.paramOrder.indexOf( key );
 	if ( keyPos > -1 ) {
 		this.paramOrder.splice( keyPos, 1 );
 		this.emit( 'change-paramOrder', this.paramOrder );
@@ -680,11 +680,11 @@ mw.TemplateData.Model.prototype.setParamProperty = function ( paramKey, prop, va
 
 	if ( allProps[ prop ].type === 'array' && $.type( value ) === 'string' ) {
 		// When we split the string, we want to use a trimmed delimiter
-		value = this.constructor.static.splitAndTrimArray( value, $.trim( allProps[ prop ].delimiter ) );
+		value = this.constructor.static.splitAndTrimArray( value, allProps[ prop ].delimiter.trim() );
 	}
 
 	// Check if the property is split by language code
-	if ( $.inArray( prop, propertiesWithLanguage ) !== -1 ) {
+	if ( propertiesWithLanguage.indexOf( prop ) !== -1 ) {
 		// Initialize property if necessary
 		if ( !$.isPlainObject( this.params[ paramKey ][ prop ] ) ) {
 			this.params[ paramKey ][ prop ] = {};
@@ -828,7 +828,7 @@ mw.TemplateData.Model.prototype.isParamDeleted = function ( key ) {
 };
 
 mw.TemplateData.Model.prototype.isParamExists = function ( key ) {
-	return $.inArray( key, Object.keys( this.params ) ) > -1;
+	return Object.prototype.hasOwnProperty.call( this.params, key );
 };
 
 /**
@@ -1050,7 +1050,7 @@ mw.TemplateData.Model.prototype.outputTemplateData = function () {
  */
 mw.TemplateData.Model.prototype.getNewValidParameterKey = function ( key ) {
 	var allParamNames = this.getAllParamNames();
-	if ( this.params[ key ] || $.inArray( key, allParamNames ) !== -1 ) {
+	if ( this.params[ key ] || allParamNames.indexOf( key ) !== -1 ) {
 		// Change the key to be something else
 		key += this.paramIdentifierCounter;
 		this.paramIdentifierCounter++;
diff --git a/modules/ext.templateDataGenerator.sourceHandler.js b/modules/ext.templateDataGenerator.sourceHandler.js
index f31e897b..c0301a62 100644
--- a/modules/ext.templateDataGenerator.sourceHandler.js
+++ b/modules/ext.templateDataGenerator.sourceHandler.js
@@ -177,7 +177,7 @@ mw.TemplateData.SourceHandler.prototype.extractParametersFromTemplateCode = func
 		}
 		if ( paramNames.indexOf( matches[ 1 ] ) === -1 ) {
 			normalizedParamNames.push( normalizedParamName );
-			paramNames.push( $.trim( matches[ 1 ] ) );
+			paramNames.push( matches[ 1 ].trim() );
 		}
 	}
 
@@ -201,10 +201,10 @@ mw.TemplateData.SourceHandler.prototype.parseModelFromString = function ( templa
 	);
 
 	// Check if <templatedata> exists
-	if ( parts && parts[ 1 ] && $.trim( parts[ 1 ] ).length > 0 ) {
+	if ( parts && parts[ 1 ] && parts[ 1 ].trim().length > 0 ) {
 		// Parse the json string
 		try {
-			return JSON.parse( $.trim( parts[ 1 ] ) );
+			return JSON.parse( parts[ 1 ].trim() );
 		} catch ( err ) {
 			return null;
 		}
diff --git a/modules/ext.templateDataGenerator.ui.tdDialog.js b/modules/ext.templateDataGenerator.ui.tdDialog.js
index 120ad325..27159809 100644
--- a/modules/ext.templateDataGenerator.ui.tdDialog.js
+++ b/modules/ext.templateDataGenerator.ui.tdDialog.js
@@ -386,7 +386,7 @@ mw.TemplateData.Dialog.prototype.onNewLanguageSearchResultsChoose = function ( i
 		newLanguage = item.getData().code;
 
 	if ( newLanguage ) {
-		if ( $.inArray( newLanguage, this.availableLanguages ) === -1 ) {
+		if ( this.availableLanguages.indexOf( newLanguage ) === -1 ) {
 			// Add new language
 			this.availableLanguages.push( newLanguage );
 			languageButton = new OO.ui.MenuOptionWidget( {
@@ -659,7 +659,7 @@ mw.TemplateData.Dialog.prototype.changeParamPropertyInput = function ( paramKey,
 		} else if ( prop.type === 'boolean' ) {
 			propInput.setSelected( !!value );
 		} else {
-			if ( $.inArray( propName, languageProps ) !== -1 ) {
+			if ( languageProps.indexOf( propName ) !== -1 ) {
 				propInput.setValue( value[ lang ] );
 			} else {
 				if ( prop.type === 'array' && $.type( value ) === 'array' ) {
@@ -842,9 +842,9 @@ mw.TemplateData.Dialog.prototype.toggleNoticeMessage = function ( type, isShowin
 		}
 		isShowing = isShowing || !noticeReference.$element.is( ':visible' );
 
-		if ( $.type( noticeMessage ) === 'array' ) {
+		if ( Array.isArray( noticeMessage ) ) {
 			$message = $( '<div>' );
-			$.each( noticeMessage, function ( i, msg ) {
+			noticeMessage.forEach( function ( msg ) {
 				$message.append( $( '<p>' ).text( msg ) );
 			} );
 			noticeReference.setLabel( $message );
@@ -926,7 +926,7 @@ mw.TemplateData.Dialog.prototype.getSetupProcess = function ( data ) {
 			// Fill up the language selection
 			if (
 				languages.length === 0 ||
-				$.inArray( language, languages ) === -1
+				languages.indexOf( language ) === -1
 			) {
 				// Add the default language
 				languageItems.push( new OO.ui.MenuOptionWidget( {
diff --git a/package.json b/package.json
index a88fb2a6..5e3a71f4 100644
--- a/package.json
+++ b/package.json
@@ -5,15 +5,13 @@
 		"doc": "jsduck"
 	},
 	"devDependencies": {
-		"eslint-config-wikimedia": "0.8.1",
-		"eslint-plugin-qunit": "3.3.1",
+		"eslint-config-wikimedia": "0.9.0",
 		"grunt": "1.0.3",
 		"grunt-banana-checker": "0.6.0",
 		"grunt-contrib-watch": "1.1.0",
 		"grunt-eslint": "21.0.0",
 		"grunt-jsonlint": "1.1.0",
 		"grunt-stylelint": "0.10.1",
-		"stylelint": "9.2.0",
-		"stylelint-config-wikimedia": "0.4.3"
+		"stylelint-config-wikimedia": "0.5.0"
 	}
 }
diff --git a/tests/qunit/ext.templateData.tests.js b/tests/qunit/ext.templateData.tests.js
index d32fb295..28d2511e 100644
--- a/tests/qunit/ext.templateData.tests.js
+++ b/tests/qunit/ext.templateData.tests.js
@@ -17,49 +17,49 @@
 	originalWikitext = 'Some text here that is not templatedata information.' +
 		'<templatedata>' +
 		'{' +
-		'	"description": {\n' +
-		'		"' + currLanguage + '": "Label unsigned comments in a conversation.",\n' +
-		'		"blah": "Template description in some blah language."\n' +
-		'	},' +
-		'	"params": {' +
-		'		"user": {' +
-		'			"label": "Username",' +
-		'			"type": "wiki-user-name",' +
-		'			"required": true,' +
-		'			"description": "User name of person who forgot to sign their comment.",' +
-		'			"aliases": ["1"]' +
-		'		},' +
-		'		"date": {' +
-		'			"label": "Date",' +
-		'			"description": {' +
-		'				"' + currLanguage + '": "Timestamp of when the comment was posted, in YYYY-MM-DD format."' +
-		'			},' +
-		'			"aliases": ["2"],' +
-		'			"autovalue": "{{subst:CURRENTMONTHNAME}}",' +
-		'			"suggested": true' +
-		'		},' +
-		'		"year": {' +
-		'			"label": "Year",' +
-		'			"type": "number"' +
-		'		},' +
-		'		"month": {' +
-		'			"label": "Month",' +
-		'			"inherits": "year"' +
-		'		},' +
-		'		"day": {' +
-		'			"label": "Day",' +
-		'			"inherits": "year"' +
-		'		},' +
-		'		"comment": {' +
-		'			"required": false' +
-		'		}' +
-		'	},' +
-		'	"sets": [' +
-		'		{' +
-		'			"label": "Date",' +
-		'			"params": ["year", "month", "day"]' +
-		'		}' +
-		'	]' +
+			'"description": {\n' +
+				'"' + currLanguage + '": "Label unsigned comments in a conversation.",\n' +
+				'"blah": "Template description in some blah language."\n' +
+			'},' +
+			'"params": {' +
+				'"user": {' +
+					'"label": "Username",' +
+					'"type": "wiki-user-name",' +
+					'"required": true,' +
+					'"description": "User name of person who forgot to sign their comment.",' +
+					'"aliases": ["1"]' +
+				'},' +
+				'"date": {' +
+					'"label": "Date",' +
+					'"description": {' +
+						'"' + currLanguage + '": "Timestamp of when the comment was posted, in YYYY-MM-DD format."' +
+					'},' +
+					'"aliases": ["2"],' +
+					'"autovalue": "{{subst:CURRENTMONTHNAME}}",' +
+					'"suggested": true' +
+				'},' +
+				'"year": {' +
+					'"label": "Year",' +
+					'"type": "number"' +
+				'},' +
+				'"month": {' +
+					'"label": "Month",' +
+					'"inherits": "year"' +
+				'},' +
+				'"day": {' +
+					'"label": "Day",' +
+					'"inherits": "year"' +
+				'},' +
+				'"comment": {' +
+					'"required": false' +
+				'}' +
+			'},' +
+			'"sets": [' +
+				'{' +
+					'"label": "Date",' +
+					'"params": ["year", "month", "day"]' +
+				'}' +
+			']' +
 		'}' +
 		'</templatedata>' +
 		'Trailing text at the end.';
@@ -602,27 +602,27 @@
 	QUnit.test( 'TemplateData sourceHandler', function ( assert ) {
 		var sourceHandler = new mw.TemplateData.SourceHandler(),
 			erronousString = '<templatedata>{\n' +
-				'	"params": {\n' +
-				// Open quote
-				'		"user: {\n' +
-				'			"label": "Username",\n' +
-				'			"type": "wiki-user-name",\n' +
-				'			"required": true,\n' +
-				'			"description": "User name of person who forgot to sign their comment.",\n' +
-				'			"aliases": [\n' +
-				'				"1"\n' +
-				'			]\n' +
-				'		},\n' +
-				'		"date": {\n' +
-				'			"label": "Date",\n' +
-				'			"description": {\n' +
-				// Forgotten quotes
-				'				' + currLanguage + ': "Timestamp of when the comment was posted, in YYYY-MM-DD format."\n' +
-				'			}\n' +
-				'			"suggested": true\n' +
-				'		}\n' +
-				'	}\n' +
-				'}</templatedata>',
+				'"params": {\n' +
+					// Open quote
+					'"user: {\n' +
+						'"label": "Username",\n' +
+						'"type": "wiki-user-name",\n' +
+						'"required": true,\n' +
+						'"description": "User name of person who forgot to sign their comment.",\n' +
+						'"aliases": [\n' +
+							'"1"\n' +
+						']\n' +
+					'},\n' +
+					'"date": {\n' +
+						'"label": "Date",\n' +
+						'"description": {\n' +
+							// Forgotten quotes
+							currLanguage + ': "Timestamp of when the comment was posted, in YYYY-MM-DD format."\n' +
+						'}\n' +
+						'"suggested": true\n' +
+					'}\n' +
+				'}\n' +
+			'}</templatedata>',
 			done = assert.async(),
 			promise;
 
@@ -637,7 +637,7 @@
 	QUnit.test( 'TemplateData sourceHandler adding default format', function ( assert ) {
 		var sourceHandler = new mw.TemplateData.SourceHandler(),
 			simpleTemplateDataNoFormat = '<templatedata>{\n' +
-				'	"params": {}\n' +
+					'"params": {}\n' +
 				'}</templatedata>',
 			simpleTemplateDataDefaultFormat = {
 				params: {}