.eslintrc.js

module.exports = {
	extends: ["eslint:recommended", "plugin:vue/recommended"],
	//在这里添加更多的通用规则集，例如：
	plugins: ["react", "html", "vue"],
	env: {
		node: true,
		jquery: true,
		es6: true,
		browser: true
	},
	globals: {
		angular: false,
		__DEV__: true,
		weex: true,
		Vue: true
	},
	parserOptions: {
		parser: "babel-eslint",
		ecmaVersion: 2019,
		sourceType: "module"
	},
	rules: {
		"vue/html-indent": "off",
		"vue/script-indent": "off",
		"vue/html-self-closing": "off",
		"vue/max-attributes-per-line": [
			0,
			{
				singleline: 3,
				multiline: {
					max: 3,
					allowFirstLine: false
				}
			}
		],
		//官方文档 http://eslint.org/docs/rules/
		//参数：0 关闭，1 警告，2 错误
		quotes: [0, "double"], //建议使用单引号
		"no-extra-boolean-cast": 1, //多余的感叹号转布尔型
		"no-extra-semi": 0, //多余的分号
		"no-extra-parens": 1, //多余的括号
		"no-empty": 2, //空代码块
		//使用前未定义
		"no-use-before-define": [1, "nofunc"],
		complexity: [0, 10], //圈复杂度大于*
		// 定义数组或对象最后多余的逗号
		"comma-dangle": [2, "never"],

		// 不允许对全局变量赋值,如 window = 'abc'
		"no-global-assign": [
			"error",
			{
				// 定义例外
				// "exceptions": ["Object"]
			}
		],
		"no-var": 2, //用let或const替代var
		"no-const-assign": 2, //不允许const重新赋值
		"no-class-assign": 2, //不允许对class重新赋值
		"no-debugger": 1, //debugger 调试代码未删除
		"no-console": 0, //console 未删除
		"no-constant-condition": 2, //常量作为条件
		"no-dupe-args": 2, //参数重复
		"no-dupe-keys": 2, //对象属性重复
		"no-duplicate-case": 2, //case重复
		"no-empty-character-class": 2, //正则无法匹配任何值
		"no-invalid-regexp": 2, //无效的正则
		"no-func-assign": 2, //函数被赋值
		"valid-typeof": 1, //无效的类型判断
		"no-unreachable": 2, //不可能执行到的代码
		"no-unexpected-multiline": 2, //行尾缺少分号可能导致一些意外情况
		"no-sparse-arrays": 1, //数组中多出逗号
		"no-shadow-restricted-names": 2, //关键词与命名冲突
		"no-undef": 1, //变量未定义
		"no-unused-vars": 1, //变量定义后未使用
		"no-cond-assign": 2, //条件语句中禁止赋值操作
		"no-native-reassign": 2, //禁止覆盖原生对象
		"no-mixed-spaces-and-tabs": 0,
		"new-cap": 2, //函数名首行大写必须使用new方式调用，首行小写必须用不带new方式调用
		"new-parens": 2, //new时必须加小括号
		"newline-after-var": 0, //变量声明后是否需要空一行
		"constructor-super": 2, //要求在构造函数中有 super() 的调用
		//代码风格优化 --------------------------------------
		semi: [2, "never", { beforeStatementContinuationChars: "never" }], //要求或禁止使用分号代替 ASI (semi)
		"arrow-body-style": [1, "always"], //	要求箭头函数体使用大括号
		"arrow-parens": [0, "as-needed", { requireForBlockBody: true }], //要求箭头函数的参数使用圆括号
		"no-duplicate-imports": [1, { includeExports: true }], //禁止重复导入
		eqeqeq: [2, "always", { null: "ignore" }], //要求使用 === 和 !==
		"no-irregular-whitespace": 0,
		"no-else-return": 0, //在else代码块中return，else是多余的
		"no-multi-spaces": 0, //不允许多个空格
		//object直接量建议写法 : 后一个空格前面不留空格
		"key-spacing": [
			1,
			{
				beforeColon: false,
				afterColon: true
			}
		],

		"block-scoped-var": 1, //变量应在外部上下文中声明，不应在{}代码块中
		"consistent-return": 0, //函数返回值可能是不同类型
		"accessor-pairs": 1, //object getter/setter方法需要成对出现

		//换行调用对象方法  点操作符应写在行首
		"dot-location": [1, "property"],
		"no-lone-blocks": 1, //多余的{}嵌套
		"no-labels": 1, //无用的标记
		"no-extend-native": 1, //禁止扩展原生对象
		"no-floating-decimal": 1, //浮点型需要写全 禁止.1 或 2.写法
		"no-loop-func": 1, //禁止在循环体中定义函数
		"no-new-func": 1, //禁止new Function(...) 写法
		"no-self-compare": 1, //不允与自己比较作为条件
		"no-sequences": 1, //禁止可能导致结果不明确的逗号操作符
		"no-throw-literal": 1, //禁止抛出一个直接量 应是Error对象

		//不允return时有赋值操作
		"no-return-assign": [1, "always"],

		//不允许重复声明
		"no-redeclare": [
			1,
			{
				builtinGlobals: true
			}
		],

		//不执行的表达式
		"no-unused-expressions": [
			0,
			{
				allowShortCircuit: true,
				allowTernary: true
			}
		],
		"no-useless-call": 1, //无意义的函数call或apply
		"no-useless-concat": 1, //无意义的string concat
		"no-void": 1, //禁用void
		"no-with": 1, //禁用with
		"space-infix-ops": 2, //操作符前后空格

		// 强制使用有效的 JSDoc 注释
		"valid-jsdoc": [
			0,
			{
				requireParamDescription: true,
				requireReturnDescription: true
			}
		],

		// 标记未写注释
		"no-warning-comments": [
			1,
			{
				terms: ["todo", "fixme", "any other term"],
				location: "anywhere"
			}
		],
		curly: 0, //if、else、while、for代码块用{}包围
		"vue/no-parsing-error": [
			2,
			{
				"abrupt-closing-of-empty-comment": true,
				"absence-of-digits-in-numeric-character-reference": true,
				"cdata-in-html-content": true,
				"character-reference-outside-unicode-range": true,
				"control-character-in-input-stream": true,
				"control-character-reference": true,
				"eof-before-tag-name": true,
				"eof-in-cdata": true,
				"eof-in-comment": true,
				"eof-in-tag": true,
				"incorrectly-closed-comment": true,
				"incorrectly-opened-comment": true,
				"invalid-first-character-of-tag-name": true,
				"missing-attribute-value": true,
				"missing-end-tag-name": true,
				"missing-semicolon-after-character-reference": true,
				"missing-whitespace-between-attributes": true,
				"nested-comment": true,
				"noncharacter-character-reference": true,
				"noncharacter-in-input-stream": true,
				"null-character-reference": true,
				"surrogate-character-reference": true,
				"surrogate-in-input-stream": true,
				"unexpected-character-in-attribute-name": true,
				"unexpected-character-in-unquoted-attribute-value": true,
				"unexpected-equals-sign-before-attribute-name": true,
				"unexpected-null-character": true,
				"unexpected-question-mark-instead-of-tag-name": true,
				"unexpected-solidus-in-tag": true,
				"unknown-named-character-reference": true,
				"end-tag-with-attributes": true,
				"duplicate-attribute": true,
				"end-tag-with-trailing-solidus": true,
				"non-void-html-element-start-tag-with-trailing-solidus": false,
				"x-invalid-end-tag": true,
				"x-invalid-namespace": true
			}
		]
	}
}