space-unary-ops

在一元运算符之前或之后强制执行一致的间距

一些该规则报告的问题可以通过 --fix 命令行选项 自动修复

一些样式指南要求或不允许在一元运算符之前或之后有空格。这主要是一个风格问题，然而，一些 JavaScript 表达式可以在没有空格的情况下编写，这使得它更难阅读和维护。

规则详情

此规则强制 words 一元运算符之后和 nonwords 一元运算符之后/之前的空格保持一致。

对于 words 运算符，此规则仅适用于语法上不需要空格的情况。例如，delete obj.foo 需要空格，此规则不会考虑。等效的 delete(obj.foo) 有一个可选空格 (delete (obj.foo))，因此该规则将适用于它。

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// new
var joe = new Person();

// delete
var obj = {
    foo: 'bar'
};
delete obj.foo;

// typeof
typeof {} // object

// void
void 0 // undefined

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if ([1,2,3].indexOf(1) !== -1) {};
foo = --foo;
bar = bar++;
baz = !foo;
qux = !!baz;

选项

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    "space-unary-ops": [
        2, {
          "words": true,
          "nonwords": false,
          "overrides": {
            "new": false,
            "++": true
          }
    }]

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/*eslint space-unary-ops: "error"*/

typeof!foo;

void{foo:0};

new[foo][0];

delete(foo.bar);

++ foo;

foo --;

- foo;

+ "3";

/*eslint space-unary-ops: "error"*/
/*eslint-env es6*/

function *foo() {
    yield(0)
}

/*eslint space-unary-ops: "error"*/

async function foo() {
    await(bar);
}

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/*eslint space-unary-ops: "error"*/

// Word unary operator "typeof" is followed by a whitespace.
typeof !foo;

// Word unary operator "void" is followed by a whitespace.
void {foo:0};

// Word unary operator "new" is followed by a whitespace.
new [foo][0];

// Word unary operator "delete" is followed by a whitespace.
delete (foo.bar);

// Unary operator "++" is not followed by whitespace.
++foo;

// Unary operator "--" is not preceded by whitespace.
foo--;

// Unary operator "-" is not followed by whitespace.
-foo;

// Unary operator "+" is not followed by whitespace.
+"3";

/*eslint space-unary-ops: "error"*/
/*eslint-env es6*/

function *foo() {
    yield (0)
}

/*eslint space-unary-ops: "error"*/

async function foo() {
    await (bar);
}