arrow-spacing

在箭头函数中的箭头前后强制执行一致的间距

此规则规范箭头函数的箭头(=>)前后的空格样式。

🌐 This rule normalize style of spacing before/after an arrow function’s arrow(=>).

// { "before": true, "after": true }
(a) => {}

// { "before": false, "after": false }
(a)=>{}
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规则详情

🌐 Rule Details

此规则接受一个对象参数，该对象具有 before 和 after 属性，每个属性都有一个布尔值。

🌐 This rule takes an object argument with before and after properties, each with a Boolean value.

默认配置是 { "before": true, "after": true }。

🌐 The default configuration is { "before": true, "after": true }.

true 意味着应该有 一个或多个空格，而 false 意味着 没有空格。

使用默认 { "before": true, "after": true } 选项时，该规则的错误代码示例：

🌐 Examples of incorrect code for this rule with the default { "before": true, "after": true } option:

/*eslint arrow-spacing: "error"*/

()=> {};
() =>{};
(a)=> {};
(a) =>{};
a =>a;
a=> a;
()=> {'\n'};
() =>{'\n'};
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使用默认 { "before": true, "after": true } 选项时，该规则的正确代码示例：

🌐 Examples of correct code for this rule with the default { "before": true, "after": true } option:

/*eslint arrow-spacing: "error"*/

() => {};
(a) => {};
a => a;
() => {'\n'};
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使用 { "before": false, "after": false } 选项时违反此规则的错误代码示例：

🌐 Examples of incorrect code for this rule with the { "before": false, "after": false } option:

/*eslint arrow-spacing: ["error", { "before": false, "after": false }]*/

() =>{};
(a) => {};
()=> {'\n'};
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使用 { "before": false, "after": false } 选项时，此规则的正确代码示例：

🌐 Examples of correct code for this rule with the { "before": false, "after": false } option:

/*eslint arrow-spacing: ["error", { "before": false, "after": false }]*/

()=>{};
(a)=>{};
()=>{'\n'};
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使用 { "before": false, "after": true } 选项时违反此规则的错误代码示例：

🌐 Examples of incorrect code for this rule with the { "before": false, "after": true } option:

/*eslint arrow-spacing: ["error", { "before": false, "after": true }]*/

() =>{};
(a) => {};
()=>{'\n'};
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使用 { "before": false, "after": true } 选项时，此规则的正确代码示例：

🌐 Examples of correct code for this rule with the { "before": false, "after": true } option:

/*eslint arrow-spacing: ["error", { "before": false, "after": true }]*/

()=> {};
(a)=> {};
()=> {'\n'};
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版本

此规则是在 ESLint v1.0.0-rc-1 中引入。

资源

• 规则源码
• 测试源码