Use eslint and prettier

Author: ota-meshi

.eslintignore

@@ -0,0 +1,3 @@
+test/fixtures/*
+coverage/**
+.nyc_output/**

.eslintrc.js

@@ -0,0 +1,9 @@
+module.exports = {
+	parserOptions: {
+		ecmaVersion: 2019,
+	},
+	extends: ['stylelint', 'prettier'],
+	rules: {
+		'jest/valid-expect': 'off',
+	},
+};

.github/workflows/nodejs.yml

@@ -4,10 +4,10 @@ on:
   push:
     branches:
       - master
-      - "dependabot/**"
+      - 'dependabot/**'
   pull_request:
     branches:
-      - "**"
+      - '**'
 
 env:
   CI: true

.npmignore

@@ -2,13 +2,17 @@
 *.pid
 *.seed
 .editorconfig
+.eslintignore
 .eslintrc*
 .git
+.github
 .gitignore
 .grunt
 .lock-wscript
 .node_repl_history
 .nyc_output
+.prettierrc.js
+.prettierignore
 .stylelintrc*
 .travis.yml
 .vscode

.prettierignore

@@ -0,0 +1,3 @@
+test/fixtures/*
+coverage/**
+.nyc_output/**

.prettierrc.js

@@ -0,0 +1,23 @@
+'use strict';
+
+// https://prettier.io/docs/en/options.html
+module.exports = {
+	arrowParens: 'always',
+	endOfLine: 'lf',
+	printWidth: 100,
+	singleQuote: true,
+	trailingComma: 'es5',
+	useTabs: true,
+	overrides: [
+		{
+			files: ['package.json', 'package-lock.json', '*.md'],
+			options: {
+				printWidth: 80,
+				singleQuote: false,
+				tabWidth: 2,
+				trailingComma: 'none',
+				useTabs: false,
+			},
+		},
+	],
+};

README.md

@@ -45,7 +45,7 @@ const stylelint = require("stylelint");
 const syntax = require("postcss-syntax");
 postcss([stylelint({ fix: true })])
   .process(source, { syntax: syntax })
-  .then(function(result) {
+  .then(function (result) {
     // An alias for the result.css property. Use it with syntaxes that generate non-CSS output.
     result.content;
   });

camel-case.js

@@ -1,18 +1,13 @@
-"use strict";
-function camelCase (str) {
-	return str.replace(/[\w-]+/g, (s) => (
+'use strict';
+
+function camelCase(str) {
+	return str.replace(/[\w-]+/g, (s) =>
 		/^-?[a-z]+(?:-[a-z]+)+$/.test(s)
-			? s.replace(
-				/^-(ms|moz|khtml|epub|(\w+-?)*webkit)(?=-)/i,
-				"$1"
-			).replace(
-				/-\w/g,
-				s => (
-					s[1].toUpperCase()
-				)
-			)
+			? s
+					.replace(/^-(ms|moz|khtml|epub|(\w+-?)*webkit)(?=-)/i, '$1')
+					.replace(/-\w/g, (s) => s[1].toUpperCase())
 			: s
-	));
+	);
 }
 
 module.exports = camelCase;