使用ESLint做ReactNative的代码检查
效果如下:
官网:https://github.com/Intellicode/eslint-plugin-react-native
任意目录
1.安装eslint
npm install eslint
如果不行 绪执行全局命令
npm install -g eslint
2.安装eslint-plugin-react
npm install eslint-plugin-react
3.安装eslint-plugin-react-native
npm install eslint-plugin-react-native
安装后的目录在
/Users/当前用户/platform/node_modules/eslint
4.在工程下增加配置文件
eslint向导模式:
eslint --init
执行完后会生成 .eslintrc.js
5.编辑配置文件 .eslintrc.js
vi .eslintrc.js
按照官方文档配置:
增加plugins,增加react-native规则
module.exports = {
"env": {
"browser": false,
"commonjs": true,
"es6": true,
"node": true
},
"extends": ["eslint:recommended","plugin:react/recommended"],
"parserOptions": {
"ecmaFeatures": {
"experimentalObjectRestSpread": true,
"jsx": true
},
"sourceType": "module"
},
"plugins": [
"react",
"react-native"
],
"rules": {
"indent": [
"error",
4
],
"linebreak-style": [
"error",
"unix"
],
"quotes": [
"error",
"single"
],
"semi": [
"error",
"always"
],
"react-native/no-unused-styles": 2,
"react-native/split-platform-components": 2
}
};
6.覆盖
/Users/purple/platform/node_modules/eslint/lib/rules/ no-unused-vars.js
/**
* @fileoverview Rule to flag declared but unused variables
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
var lodash = require("lodash");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var MESSAGE = "'{{name}}' is defined but never used";
var config = {
vars: "all",
args: "after-used"
};
var firstOption = context.options[0];
if (firstOption) {
if (typeof firstOption === "string") {
config.vars = firstOption;
} else {
config.vars = firstOption.vars || config.vars;
config.args = firstOption.args || config.args;
if (firstOption.varsIgnorePattern) {
config.varsIgnorePattern = new RegExp(firstOption.varsIgnorePattern);
}
if (firstOption.argsIgnorePattern) {
config.argsIgnorePattern = new RegExp(firstOption.argsIgnorePattern);
}
}
}
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Determines if a given variable is being exported from a module.
* @param {Variable} variable - EScope variable object.
* @returns {boolean} True if the variable is exported, false if not.
* @private
*/
function isExported(variable) {
var definition = variable.defs[0];
if (definition) {
var node = definition.node;
if (node.type === "VariableDeclarator") {
node = node.parent;
} else if (definition.type === "Parameter") {
return false;
}
return node.parent.type.indexOf("Export") === 0;
} else {
return false;
}
}
/**
* Determines if a reference is a read operation.
* @param {Reference} ref - An escope Reference
* @returns {Boolean} whether the given reference represents a read operation
* @private
*/
function isReadRef(ref) {
return ref.isRead();
}
/**
* Determine if an identifier is referencing an enclosing function name.
* @param {Reference} ref - The reference to check.
* @param {ASTNode[]} nodes - The candidate function nodes.
* @returns {boolean} True if it's a self-reference, false if not.
* @private
*/
function isSelfReference(ref, nodes) {
var scope = ref.from;
while (scope) {
if (nodes.indexOf(scope.block) >= 0) {
return true;
}
scope = scope.upper;
}
return false;
}
/**
* Determines if the variable is used.
* @param {Variable} variable - The variable to check.
* @param {Reference[]} references - The variable references to check.
* @returns {boolean} True if the variable is used
*/
function isUsedVariable(variable) {
var functionNodes = variable.defs.filter(function(def) {
return def.type === "FunctionName";
}).map(function(def) {
return def.node;
}),
isFunctionDefinition = functionNodes.length > 0;
return variable.references.some(function(ref) {
return isReadRef(ref) && !(isFunctionDefinition && isSelfReference(ref, functionNodes));
});
}
/**
* Gets an array of variables without read references.
* @param {Scope} scope - an escope Scope object.
* @param {Variable[]} unusedVars - an array that saving result.
* @returns {Variable[]} unused variables of the scope and descendant scopes.
* @private
*/
function collectUnusedVariables(scope, unusedVars) {
var variables = scope.variables;
var childScopes = scope.childScopes;
var i, l;
if (scope.type !== "TDZ" && (scope.type !== "global" || config.vars === "all")) {
for (i = 0, l = variables.length; i < l; ++i) {
var variable = variables[i];
// skip a variable of class itself name in the class scope
if (scope.type === "class" && scope.block.id === variable.identifiers[0]) {
continue;
}
// skip function expression names and variables marked with markVariableAsUsed()
if (scope.functionExpressionScope || variable.eslintUsed || variables[i].eslintJSXUsed) {
continue;
}
// skip implicit "arguments" variable
if (scope.type === "function" && variable.name === "arguments" && variable.identifiers.length === 0) {
continue;
}
// explicit global variables don't have definitions.
var def = variable.defs[0];
if (def) {
var type = def.type;
// skip catch variables
if (type === "CatchClause") {
continue;
}
if (type === "Parameter") {
// skip any setter argument
if (def.node.parent.type === "Property" && def.node.parent.kind === "set") {
continue;
}
// if "args" option is "none", skip any parameter
if (config.args === "none") {
continue;
}
// skip ignored parameters
if (config.argsIgnorePattern && config.argsIgnorePattern.test(def.name.name)) {
continue;
}
// if "args" option is "after-used", skip all but the last parameter
if (config.args === "after-used" && def.index < def.node.params.length - 1) {
continue;
}
} else {
// skip ignored variables
if (config.varsIgnorePattern && config.varsIgnorePattern.test(def.name.name)) {
continue;
}
}
}
if (!isUsedVariable(variable) && !isExported(variable)) {
unusedVars.push(variable);
}
}
}
for (i = 0, l = childScopes.length; i < l; ++i) {
collectUnusedVariables(childScopes[i], unusedVars);
}
return unusedVars;
}
/**
* Gets the index of a given variable name in a given comment.
* @param {escope.Variable} variable - A variable to get.
* @param {ASTNode} comment - A comment node which includes the variable name.
* @returns {number} The index of the variable name's location.
*/
function getColumnInComment(variable, comment) {
var namePattern = new RegExp("[\\s,]" + lodash.escapeRegExp(variable.name) + "(?:$|[\\s,:])", "g");
// To ignore the first text "global".
namePattern.lastIndex = comment.value.indexOf("global") + 6;
// Search a given variable name.
var match = namePattern.exec(comment.value);
return match ? match.index + 1 : 0;
}
/**
* Creates the correct location of a given variables.
* The location is at its name string in a `/*global` comment.
*
* @param {escope.Variable} variable - A variable to get its location.
* @returns {{line: number, column: number}} The location object for the variable.
*/
function getLocation(variable) {
var comment = variable.eslintExplicitGlobalComment;
var baseLoc = comment.loc.start;
var column = getColumnInComment(variable, comment);
var prefix = comment.value.slice(0, column);
var lineInComment = (prefix.match(/\n/g) || []).length;
if (lineInComment > 0) {
column -= 1 + prefix.lastIndexOf("\n");
} else {
// 2 is for `/*`
column += baseLoc.column + 2;
}
return {
line: baseLoc.line + lineInComment,
column: column
};
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"Program:exit": function(programNode) {
var unusedVars = collectUnusedVariables(context.getScope(), []);
for (var i = 0, l = unusedVars.length; i < l; ++i) {
var unusedVar = unusedVars[i];
if (unusedVar.eslintExplicitGlobal) {
context.report({
node: programNode,
loc: getLocation(unusedVar),
message: MESSAGE,
data: unusedVar
});
} else if (unusedVar.defs.length > 0) {
context.report({
node: unusedVar.identifiers[0],
message: MESSAGE,
data: unusedVar
});
}
}
},
"XJSIdentifier": function(node) {
var scope = context.getScope(),
variables = scope.variables,
i,
len;
// mark XJSIdentifiers with a special flag
for (i = 0, len = variables.length; i < len; i++) {
if (variables[i].name === node.name) {
variables[i].eslintJSXUsed = true;
break;
}
}
}
};
};
module.exports.schema = [
{
"oneOf": [
{
"enum": ["all", "local"]
},
{
"type": "object",
"properties": {
"vars": {
"enum": ["all", "local"]
},
"varsIgnorePattern": {
"type": "string"
},
"args": {
"enum": ["all", "after-used", "none"]
},
"argsIgnorePattern": {
"type": "string"
}
}
}
]
}
];
主要是解决es6下模块导入检查的BUG
增加了XJSIdentifier方法修复。
7.执行命令检查
eslint index.ios.js
规则命令:
"no-alert": 0,//禁止使用alert confirm prompt
"no-array-constructor": 2,//禁止使用数组构造器
"no-bitwise": 0,//禁止使用按位运算符
"no-caller": 1,//禁止使用arguments.caller或arguments.callee
"no-catch-shadow": 2,//禁止catch子句参数与外部作用域变量同名
"no-class-assign": 2,//禁止给类赋值
"no-cond-assign": 2,//禁止在条件表达式中使用赋值语句
"no-console": 2,//禁止使用console
"no-const-assign": 2,//禁止修改const声明的变量
"no-constant-condition": 2,//禁止在条件中使用常量表达式 if(true) if(1)
"no-continue": 0,//禁止使用continue
"no-control-regex": 2,//禁止在正则表达式中使用控制字符
"no-debugger": 2,//禁止使用debugger
"no-delete-var": 2,//不能对var声明的变量使用delete操作符
"no-div-regex": 1,//不能使用看起来像除法的正则表达式/=foo/
"no-dupe-keys": 2,//在创建对象字面量时不允许键重复 {a:1,a:1}
"no-dupe-args": 2,//函数参数不能重复
"no-duplicate-case": 2,//switch中的case标签不能重复
"no-else-return": 2,//如果if语句里面有return,后面不能跟else语句
"no-empty": 2,//块语句中的内容不能为空
"no-empty-character-class": 2,//正则表达式中的[]内容不能为空
"no-empty-label": 2,//禁止使用空label
"no-eq-null": 2,//禁止对null使用==或!=运算符
"no-eval": 1,//禁止使用eval
"no-ex-assign": 2,//禁止给catch语句中的异常参数赋值
"no-extend-native": 2,//禁止扩展native对象
"no-extra-bind": 2,//禁止不必要的函数绑定
"no-extra-boolean-cast": 2,//禁止不必要的bool转换
"no-extra-parens": 2,//禁止非必要的括号
"no-extra-semi": 2,//禁止多余的冒号
"no-fallthrough": 1,//禁止switch穿透
"no-floating-decimal": 2,//禁止省略浮点数中的0 .5 3.
"no-func-assign": 2,//禁止重复的函数声明
"no-implicit-coercion": 1,//禁止隐式转换
"no-implied-eval": 2,//禁止使用隐式eval
"no-inline-comments": 0,//禁止行内备注
"no-inner-declarations": [2, "functions"],//禁止在块语句中使用声明(变量或函数)
"no-invalid-regexp": 2,//禁止无效的正则表达式
"no-invalid-this": 2,//禁止无效的this,只能用在构造器,类,对象字面量
"no-irregular-whitespace": 2,//不能有不规则的空格
"no-iterator": 2,//禁止使用__iterator__ 属性
"no-label-var": 2,//label名不能与var声明的变量名相同
"no-labels": 2,//禁止标签声明
"no-lone-blocks": 2,//禁止不必要的嵌套块
"no-lonely-if": 2,//禁止else语句内只有if语句
"no-loop-func": 1,//禁止在循环中使用函数(如果没有引用外部变量不形成闭包就可以)
"no-mixed-requires": [0, false],//声明时不能混用声明类型
"no-mixed-spaces-and-tabs": [2, false],//禁止混用tab和空格
"linebreak-style": [0, "windows"],//换行风格
"no-multi-spaces": 1,//不能用多余的空格
"no-multi-str": 2,//字符串不能用\换行
"no-multiple-empty-lines": [1, {"max": 2}],//空行最多不能超过2行
"no-native-reassign": 2,//不能重写native对象
"no-negated-in-lhs": 2,//in 操作符的左边不能有!
"no-nested-ternary": 0,//禁止使用嵌套的三目运算
"no-new": 1,//禁止在使用new构造一个实例后不赋值
"no-new-func": 1,//禁止使用new Function
"no-new-object": 2,//禁止使用new Object()
"no-new-require": 2,//禁止使用new require
"no-new-wrappers": 2,//禁止使用new创建包装实例,new String new Boolean new Number
"no-obj-calls": 2,//不能调用内置的全局对象,比如Math() JSON()
"no-octal": 2,//禁止使用八进制数字
"no-octal-escape": 2,//禁止使用八进制转义序列
"no-param-reassign": 2,//禁止给参数重新赋值
"no-path-concat": 0,//node中不能使用__dirname或__filename做路径拼接
"no-plusplus": 0,//禁止使用++,--
"no-process-env": 0,//禁止使用process.env
"no-process-exit": 0,//禁止使用process.exit()
"no-proto": 2,//禁止使用__proto__属性
"no-redeclare": 2,//禁止重复声明变量
"no-regex-spaces": 2,//禁止在正则表达式字面量中使用多个空格 /foo bar/
"no-restricted-modules": 0,//如果禁用了指定模块,使用就会报错
"no-return-assign": 1,//return 语句中不能有赋值表达式
"no-script-url": 0,//禁止使用javascript:void(0)
"no-self-compare": 2,//不能比较自身
"no-sequences": 0,//禁止使用逗号运算符
"no-shadow": 2,//外部作用域中的变量不能与它所包含的作用域中的变量或参数同名
"no-shadow-restricted-names": 2,//严格模式中规定的限制标识符不能作为声明时的变量名使用
"no-spaced-func": 2,//函数调用时 函数名与()之间不能有空格
"no-sparse-arrays": 2,//禁止稀疏数组, [1,,2]
"no-sync": 0,//nodejs 禁止同步方法
"no-ternary": 0,//禁止使用三目运算符
"no-trailing-spaces": 1,//一行结束后面不要有空格
"no-this-before-super": 0,//在调用super()之前不能使用this或super
"no-throw-literal": 2,//禁止抛出字面量错误 throw "error";
"no-undef": 1,//不能有未定义的变量
"no-undef-init": 2,//变量初始化时不能直接给它赋值为undefined
"no-undefined": 2,//不能使用undefined
"no-unexpected-multiline": 2,//避免多行表达式
"no-underscore-dangle": 1,//标识符不能以_开头或结尾
"no-unneeded-ternary": 2,//禁止不必要的嵌套 var isYes = answer === 1 ? true : false;
"no-unreachable": 2,//不能有无法执行的代码
"no-unused-expressions": 2,//禁止无用的表达式
"no-unused-vars": [2, {"vars": "all", "args": "after-used"}],//不能有声明后未被使用的变量或参数
"no-use-before-define": 2,//未定义前不能使用
"no-useless-call": 2,//禁止不必要的call和apply
"no-void": 2,//禁用void操作符
"no-var": 0,//禁用var,用let和const代替
"no-warning-comments": [1, { "terms": ["todo", "fixme", "xxx"], "location": "start" }],//不能有警告备注
"no-with": 2,//禁用with
"array-bracket-spacing": [2, "never"],//是否允许非空数组里面有多余的空格
"arrow-parens": 0,//箭头函数用小括号括起来
"arrow-spacing": 0,//=>的前/后括号
"accessor-pairs": 0,//在对象中使用getter/setter
"block-scoped-var": 0,//块语句中使用var
"brace-style": [1, "1tbs"],//大括号风格
"callback-return": 1,//避免多次调用回调什么的
"camelcase": 2,//强制驼峰法命名
"comma-dangle": [2, "never"],//对象字面量项尾不能有逗号
"comma-spacing": 0,//逗号前后的空格
"comma-style": [2, "last"],//逗号风格,换行时在行首还是行尾
"complexity": [0, 11],//循环复杂度
"computed-property-spacing": [0, "never"],//是否允许计算后的键名什么的
"consistent-return": 0,//return 后面是否允许省略
"consistent-this": [2, "that"],//this别名
"constructor-super": 0,//非派生类不能调用super,派生类必须调用super
"curly": [2, "all"],//必须使用 if(){} 中的{}
"default-case": 2,//switch语句最后必须有default
"dot-location": 0,//对象访问符的位置,换行的时候在行首还是行尾
"dot-notation": [0, { "allowKeywords": true }],//避免不必要的方括号
"eol-last": 0,//文件以单一的换行符结束
"eqeqeq": 2,//必须使用全等
"func-names": 0,//函数表达式必须有名字
"func-style": [0, "declaration"],//函数风格,规定只能使用函数声明/函数表达式
"generator-star-spacing": 0,//生成器函数*的前后空格
"guard-for-in": 0,//for in循环要用if语句过滤
"handle-callback-err": 0,//nodejs 处理错误
"id-length": 0,//变量名长度
"indent": [2, 4],//缩进风格
"init-declarations": 0,//声明时必须赋初值
"key-spacing": [0, { "beforeColon": false, "afterColon": true }],//对象字面量中冒号的前后空格
"lines-around-comment": 0,//行前/行后备注
"max-depth": [0, 4],//嵌套块深度
"max-len": [0, 80, 4],//字符串最大长度
"max-nested-callbacks": [0, 2],//回调嵌套深度
"max-params": [0, 3],//函数最多只能有3个参数
"max-statements": [0, 10],//函数内最多有几个声明
"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": 2,//变量声明后是否需要空一行
"object-curly-spacing": [0, "never"],//大括号内是否允许不必要的空格
"object-shorthand": 0,//强制对象字面量缩写语法
"one-var": 1,//连续声明
"operator-assignment": [0, "always"],//赋值运算符 += -=什么的
"operator-linebreak": [2, "after"],//换行时运算符在行尾还是行首
"padded-blocks": 0,//块语句内行首行尾是否要空行
"prefer-const": 0,//首选const
"prefer-spread": 0,//首选展开运算
"prefer-reflect": 0,//首选Reflect的方法
"quotes": [1, "single"],//引号类型 `` "" ''
"quote-props":[2, "always"],//对象字面量中的属性名是否强制双引号
"radix": 2,//parseInt必须指定第二个参数
"id-match": 0,//命名检测
"require-yield": 0,//生成器函数必须有yield
"semi": [2, "always"],//语句强制分号结尾
"semi-spacing": [0, {"before": false, "after": true}],//分号前后空格
"sort-vars": 0,//变量声明时排序
"space-after-keywords": [0, "always"],//关键字后面是否要空一格
"space-before-blocks": [0, "always"],//不以新行开始的块{前面要不要有空格
"space-before-function-paren": [0, "always"],//函数定义时括号前面要不要有空格
"space-in-parens": [0, "never"],//小括号里面要不要有空格
"space-infix-ops": 0,//中缀操作符周围要不要有空格
"space-return-throw-case": 2,//return throw case后面要不要加空格
"space-unary-ops": [0, { "words": true, "nonwords": false }],//一元运算符的前/后要不要加空格
"spaced-comment": 0,//注释风格要不要有空格什么的
"strict": 2,//使用严格模式
"use-isnan": 2,//禁止比较时使用NaN,只能用isNaN()
"valid-jsdoc": 0,//jsdoc规则
"valid-typeof": 2,//必须使用合法的typeof的值
"vars-on-top": 2,//var必须放在作用域顶部
"wrap-iife": [2, "inside"],//立即执行函数表达式的小括号风格
"wrap-regex": 0,//正则表达式字面量用小括号包起来
"yoda": [2, "never"]//禁止尤达条件