Replace Grunt tasks with npm scripts in package.json

Adds the following npm scripts:
- npm run lint
- npm run lint:js
- npm run lint:styles
- npm run lint:i18n

Bug: T242781
Change-Id: I0c2cfce73a02029b9d0c4d329309aff477cb02d4

.eslintignore

@@ -0,0 +1,5 @@
+/.storybook/
+/docs/
+/i18n/
+/node_modules/
+/vendor/

.stylelintignore

@@ -0,0 +1,5 @@
+/.storybook/
+/docs/
+/node_modules/
+/skinStyles/jquery.ui/
+/vendor/

Gruntfile.js

@@ -1,37 +0,0 @@
-/* eslint-env node, es6 */
-module.exports = function ( grunt ) {
-	var conf = grunt.file.readJSON( 'skin.json' );
-	grunt.loadNpmTasks( 'grunt-banana-checker' );
-	grunt.loadNpmTasks( 'grunt-eslint' );
-	grunt.loadNpmTasks( 'grunt-stylelint' );
-
-	grunt.initConfig( {
-		eslint: {
-			options: {
-				extensions: [ '.js', '.json' ],
-				cache: true
-			},
-			all: [
-				'**/*.js{,on}',
-				'!{vendor,node_modules,docs}/**'
-			]
-		},
-		banana: conf.MessagesDirs,
-		stylelint: {
-			options: {
-				syntax: 'less'
-			},
-			all: [
-				'*.{less,css}',
-				'**/*.{less,css}',
-				'!node_modules/**',
-				'!docs/**',
-				'!skinStyles/jquery.ui/**',
-				'!vendor/**'
-			]
-		}
-	} );
-
-	grunt.registerTask( 'test', [ 'eslint', 'banana', 'stylelint' ] );
-	grunt.registerTask( 'default', 'test' );
-};

package.json

@@ -2,7 +2,11 @@
 	"private": true,
 	"scripts": {
 		"storybook": "./dev-scripts/setup-storybook.sh && start-storybook -p 6006",
-		"test": "grunt test && npm run doc",
+		"test": "npm -s run lint && npm run doc",
+		"lint": "npm -s run lint:js && npm -s run lint:styles && npm -s run lint:i18n",
+		"lint:js": "eslint --cache --max-warnings 0 .",
+		"lint:styles": "stylelint \"**/*.{less,css}\"",
+		"lint:i18n": "banana-checker --requireLowerCase=0 i18n/",
 		"jsdoc": "jsdoc -c jsdoc.json",
 		"doc": "npm run jsdoc && npm run build-storybook",
 		"build-storybook": "./dev-scripts/setup-storybook.sh && build-storybook -o docs/ui"
@@ -12,14 +16,12 @@
 		"@storybook/html": "5.2.8",
 		"babel-loader": "8.0.6",
 		"eslint-config-wikimedia": "0.15.0",
-		"grunt": "1.0.4",
 		"grunt-banana-checker": "0.8.1",
-		"grunt-eslint": "22.0.0",
-		"grunt-stylelint": "0.13.0",
 		"jsdoc": "3.6.3",
 		"less": "3.8.1",
 		"less-loader": "4.1.0",
 		"mustache": "3.0.1",
-		"stylelint-config-wikimedia": "0.8.0"
+		"stylelint": "10.0.1",
+		"stylelint-config-wikimedia": "0.9.0"
 	}
 }