no-void

禁止 void 运算符

void 运算符接受一个操作数并返回 undefined：void expression 将评估 expression 并返回 undefined。它可以用来忽略 expression 可能产生的任何副作用：

使用 void 运算符的常见情况是获取 "pure" undefined 值，因为在 ES5 之前，undefined 变量是可变的：

// will always return undefined
(function(){
    return void 0;
})();

// will return 1 in ES3 and undefined in ES5+
(function(){
    undefined = 1;
    return undefined;
})();

// will throw TypeError in ES5+
(function(){
    'use strict';
    undefined = 1;
})();

另一种常见的情况是缩小代码，因为 void 0 比 undefined 短：

foo = void 0;
foo = undefined;

当与 IIFE（立即调用的函数表达式）一起使用时，void 可用于强制将 function 关键字视为表达式而不是声明：

var foo = 1;
void function(){ foo = 1; }() // will assign foo a value of 1
+function(){ foo = 1; }() // same as above

function(){ foo = 1; }() // will throw SyntaxError

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规则详情

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/*eslint no-void: "error"*/

void foo
void someFunction();

var foo = void bar();
function baz() {
    return void 0;
}

选项

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allowAsStatement

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/*eslint no-void: ["error", { "allowAsStatement": true }]*/

var foo = void bar();
function baz() {
    return void 0;
}

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/*eslint no-void: ["error", { "allowAsStatement": true }]*/

void foo;
void someFunction();

何时不使用

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