Lint and format before committing

.eslintrc.js

@@ -32,57 +32,59 @@ module.exports = {
 		'@typescript-eslint/no-unused-vars': [
 			'error',
 			{
-				argsIgnorePattern: '^_'
+				argsIgnorePattern: '^_',
-			}
+			},
 		],
 		'@typescript-eslint/no-object-literal-type-assertion': 'off',
 		'@typescript-eslint/no-unused-vars': 'off',
-		'@typescript-eslint/prefer-interface': 'off'
+		'@typescript-eslint/prefer-interface': 'off',
+		'prettier/prettier': 'error',
 	},
 	globals: {
-		globalThis: false
+		globalThis: false,
 	},
 	env: {
 		es6: true,
 		browser: true,
 		node: true,
-		mocha: true
+		mocha: true,
 	},
 	extends: [
 		'eslint:recommended',
 		'plugin:import/errors',
 		'plugin:import/warnings',
 		'plugin:import/typescript',
-		'plugin:@typescript-eslint/recommended'
+		'plugin:@typescript-eslint/recommended',
+		'plugin:prettier/recommended',
 	],
 	parserOptions: {
 		ecmaVersion: 9,
-		sourceType: 'module'
+		sourceType: 'module',
 	},
-	plugins: ['svelte3'],
+	plugins: ['prettier', 'svelte3'],
 	settings: {
 		'import/core-modules': [
 			'svelte',
 			'svelte/internal',
 			'svelte/store',
 			'svelte/easing',
-			'estree'
+			'estree',
 		],
-		'svelte3/compiler': require('./compiler')
+		'svelte3/compiler': require('./compiler'),
 	},
 	overrides: [
 		{
 			files: ['*.js'],
 			rules: {
-				'@typescript-eslint/no-var-requires': 'off'
+				'@typescript-eslint/no-var-requires': 'off',
-			}
+			},
 		},
 		{
 			files: ['*.svelte'],
 			processor: 'svelte3/svelte3',
 			rules: {
-				'@typescript-eslint/indent': 'off'
+				'@typescript-eslint/indent': 'off',
-			}
+			},
-		}
+		},
-	]
+	],
 };

.prettierignore

@@ -0,0 +1 @@
+package.json

package.json

@@ -74,16 +74,21 @@
     "codecov": "^3.5.0",
     "css-tree": "1.0.0-alpha22",
     "eslint": "^6.3.0",
+    "eslint-config-prettier": "^6.10.0",
     "eslint-plugin-import": "^2.18.2",
+    "eslint-plugin-prettier": "^3.1.2",
     "eslint-plugin-svelte3": "^2.7.3",
     "estree-walker": "^1.0.0",
+    "husky": "^4.2.1",
     "is-reference": "^1.1.4",
     "jsdom": "^15.1.1",
     "kleur": "^3.0.3",
+    "lint-staged": "^10.0.7",
     "locate-character": "^2.0.5",
     "magic-string": "^0.25.3",
     "mocha": "^6.2.0",
     "periscopic": "^2.0.1",
+    "prettier": "^1.19.1",
     "puppeteer": "^1.19.0",
     "rollup": "^1.27.14",
     "source-map": "^0.7.3",
@@ -99,5 +104,16 @@
     ],
     "sourceMap": true,
     "instrument": true
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.{ts,js}": [
+      "eslint --fix",
+      "prettier --write"
+    ]
   }
 }