ESLint -- 要求或禁止函数圆括号之前有一个空格 (space-before-function-paren)

详细讲解请看space-before-function-paren

配置文件代码：

    // require or disallow space before function opening parenthesis
    // http://eslint.org/docs/rules/space-before-function-paren
    'space-before-function-paren': ['error', {
      anonymous: 'always',
      named: 'never',
      asyncArrow: 'always'
    }],

• anonymous: 'always' 针对匿名函数表达式 (比如 function () {})。
• named: 'never' 针对命名的函数表达式 (比如 function foo() {})。
• asyncArrow: 'always' 针对异步的箭头函数表达式 (比如 async () => {})。

示例代码：

选项 {"anonymous": "always", "named": "never", "asyncArrow": "always"} 的 错误 代码示例：

/*eslint space-before-function-paren: ["error", {"anonymous": "always", "named": "never", "asyncArrow": "always"}]*/
/*eslint-env es6*/

function foo () {
    // ...
}

var bar = function() {
    // ...
};

class Foo {
    constructor () {
        // ...
    }
}

var foo = {
    bar () {
        // ...
    }
};
var foo = async(a) => await a

选项 {"anonymous": "always", "named": "never", "asyncArrow": "always"} 的 正确 代码示例：

/*eslint space-before-function-paren: ["error", {"anonymous": "always", "named": "never", "asyncArrow": "always"}]*/
/*eslint-env es6*/

function foo() {
    // ...
}

var bar = function () {
    // ...
};

class Foo {
    constructor() {
        // ...
    }
}

var foo = {
    bar() {
        // ...
    }
};

var foo = async (a) => await a