.eslintrc.js

module.exports = {
	parser: "babel-eslint",
	env: {
		es6: true,
		node: true,
		browser: true,
		"jest/globals": true,
	},
	extends: [
		"eslint:recommended",
		"plugin:jest/recommended",
	],
	plugins: [
		"jest",
	],
	parserOptions: {
		ecmaFeatures: {
			experimentalObjectRestSpread: true,
		},
		sourceType: "module",
	},
	rules: {
		"arrow-body-style": ["error", "as-needed", {
			requireReturnForObjectLiteral: true,
		}],
		"arrow-parens": ["error", "as-needed"],
		"arrow-spacing": "error",
		"camelcase": ["error", {properties: "never"}],
		"comma-dangle": ["error", "always-multiline"],
		"guard-for-in": "error",
		"indent": ["error", 2],
		"keyword-spacing": "error",
		"linebreak-style": ["error","unix"],
		"no-eq-null": "error",
		"no-multi-str": "error",
		"no-trailing-spaces": "error",
		"no-useless-escape": "error",
		"no-use-before-define": ["error", {"functions": false}],
		"quotes": ["error", "single"],
		"semi": ["error", "always"],
		"space-before-blocks": ["error", {
			classes: "always",
			functions: "always",
			keywords: "always",
		}],
		"space-before-function-paren": ["error", "never"],
		"space-infix-ops": "error",
		"space-unary-ops": ["error", {
			nonwords: false,
			words: true,
		}],
		"jest/expect-expect": "off"
	},
}