.eslintrc

{
	"root": true,
	"parserOptions": {
		"ecmaVersion": 6,
		"impliedStrict": true,
		"parser": "babel-eslint",
		"sourceType": "module"
	},
	"env": {
		"browser": true,
		"jquery": true,
		"node": true
	},
	"globals": {},
	"extends": ["eslint:recommended", "plugin:compat/recommended"],
	"rules": {
		"strict": ["error", "safe"],

		/* possible errors */
		"no-cond-assign": ["error", "except-parens"], // recommended
		// "no-debugger": "error", // recommended
		"no-empty": ["error", { "allowEmptyCatch": true }], // recommended
		"no-unsafe-negation": "error",
		"valid-jsdoc": "error",

		/* best practice */
		"curly": ["error", "all"],
		"dot-location": ["warn", "property"],
		"dot-notation": ["error", { "allowKeywords": true }],
		"eqeqeq": ["warn", "smart"],
		"guard-for-in": "error",
		"no-alert": "warn",
		"no-caller": "error",
		"no-eq-null": "off",
		"no-eval": "off",
		"no-floating-decimal": "error",
		"no-loop-func": "error",
		"no-multi-spaces": ["error", { "exceptions": { "VariableDeclarator": true } }],
		"no-multi-str": "error",
		"no-param-reassign": "warn",
		"no-script-url": "off",
		"no-sequences": "error",
		"no-unused-expressions": "warn",
		"no-useless-call": "error",
		"no-useless-escape": "error",
		"no-useless-return": "error",
		"no-void": "error",
		"require-await": "warn",
		"vars-on-top": "error",
		"wrap-iife": ["error", "inside"],
		"yoda": "error",

		/* variables */
		// "init-declarations": ["error", "never", { "ignoreForLoopInit": true }],
		"no-undef": "error", // recommended
		"no-undef-init": "error",
		"no-undefined": "off",
		"no-unused-vars": ["error", { "vars": "all", "args": "after-used", "ignoreRestSiblings": false }], // recommended
		"no-use-before-define": ["error", { "functions": false }],

		/* Code Style */
		"array-bracket-spacing": ["error", "never", {}],
		"block-spacing": "error",
		"brace-style": ["error", "1tbs", { "allowSingleLine": true }],
		"camelcase": ["warn", { "properties": "always" }],
		"comma-dangle": ["error", "never"],
		"comma-spacing": ["error", { "before": false, "after": true }],
		"comma-style": ["error", "last"],
		"computed-property-spacing": ["error", "never"],
		"eol-last": "error",
		"func-call-spacing": ["error", "never"],
		"key-spacing": ["error", { "beforeColon": false, "afterColon": true }],
		"keyword-spacing": ["error", {}],
		"linebreak-style": ["error", "unix"],
		"max-lines": ["warn", { "max": 500, "skipBlankLines": true, "skipComments": true }],
		"max-nested-callbacks": ["warn", 10],
		"max-params": ["warn", 5],
		"new-parens": "error",
		"no-bitwise": "error",
		"no-lonely-if": "error",
		"no-multiple-empty-lines": "error",
		"no-plusplus": "off",
		"no-trailing-spaces": "error",
		"no-whitespace-before-property": "error",
		"one-var": ["error", "never"],
		"one-var-declaration-per-line": ["error", "always"],
		"quotes": ["error", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
		"require-jsdoc": [
			"error",
			{ "require": { "FunctionDeclaration": true, "MethodDefinition": true, "ClassDeclaration": true } }
		],
		"semi": ["error", "always"],
		"semi-spacing": ["error", { "before": false, "after": true }],
		"space-before-blocks": ["error", "always"],
		"space-before-function-paren": ["warn", { "anonymous": "always", "named": "never" }],
		"space-in-parens": ["error", "never"],
		"space-infix-ops": "error",
		"space-unary-ops": ["error", { "words": false, "nonwords": false }],
		"spaced-comment": ["error", "always"],
		"template-tag-spacing": "error",
		"wrap-regex": "error",

		/* ECMAScript 6 */
		"arrow-body-style": ["error", "always"],
		"arrow-parens": ["error", "always"],
		"arrow-spacing": "error",
		"no-duplicate-imports": "error",
		"no-new": "error",
		"no-useless-computed-key": "error",
		"no-useless-constructor": "error",
		"no-var": "warn",
		"no-with": "error",
		"prefer-const": "error",
		"sort-imports": ["error", { "ignoreCase": true }],
		"template-curly-spacing": "error"
	}
}