rest-spread-spacing
强制 rest 和 spread 运算符及其表达式之间的间距
此规则报告的一些问题可通过 --fix 命令行选项自动修复
此规则在 ESLint v8.53.0 中已弃用。请在 @stylistic/eslint-plugin-js 中使用 相应的规则。
¥This rule was deprecated in ESLint v8.53.0. Please use the corresponding rule in @stylistic/eslint-plugin-js.
ES2015 引入了 rest 和 spread 运算符，它们将可迭代的结构扩展到其各个部分。它们的一些用法示例如下：
¥ES2015 introduced the rest and spread operators, which expand an iterable structure into its individual parts. Some examples of their usage are as follows:
let numArr = [1, 2, 3];
function add(a, b, c) {
return a + b + c;
}
add(...numArr); // -> 6
let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
arr1.push(...arr2); // -> [1, 2, 3, 4, 5, 6]
let [a, b, ...arr] = [1, 2, 3, 4, 5];
a; // -> 1
b // -> 2
arr; // -> [3, 4, 5]
function numArgs(...args) {
return args.length;
}
numArgs(a, b, c); // -> 3
除了上述之外，目前还有一个提议是在规范中添加 object rest 和 spread 属性。它们可以按如下方式使用：
¥In addition to the above, there is currently a proposal to add object rest and spread properties to the spec. They can be used as follows:
let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
x; // -> 1
y; // -> 2
z; // -> { a: 3, b: 4 }
let n = { x, y, ...z };
n; // -> { x: 1, y: 2, a: 3, b: 4 }
与其他运算符一样，rest 或 spread 运算符与它所操作的表达式之间允许有空格，这可能导致代码库中的间距不一致。
¥As with other operators, whitespace is allowed between the rest or spread operator and the expression it is operating on, which can lead to inconsistent spacing within a codebase.
规则详情
¥Rule Details
这条规则的目的是在 rest 和 spread 运算符及其表达式之间强制执行一致的间距。该规则还支持 ES2018 中的 object rest 和 spread 属性：
¥This rule aims to enforce consistent spacing between rest and spread operators and their expressions. The rule also supports object rest and spread properties in ES2018:
{
"parserOptions": {
"ecmaVersion": 2018
}
}
请阅读用户指南中关于 配置解析器选项 的部分以了解更多信息。
¥Please read the user guide’s section on configuring parser options to learn more.
选项
¥Options
此规则采用一个选项：值为 "never" 或 "always" 的字符串。默认值为 "never"。
¥This rule takes one option: a string with the value of "never" or "always". The default value is "never".
“never”
使用默认 "never" 选项时，展开运算符及其表达式之间不允许有空格。
¥When using the default "never" option, whitespace is not allowed between spread operators and their expressions.
rest-spread-spacing: ["error"]
或者
¥or
rest-spread-spacing: ["error", "never"]
此规则与 "never" 的错误代码示例：
¥Examples of incorrect code for this rule with "never":
/*eslint rest-spread-spacing: ["error", "never"]*/
fn(... args);
[... arr, 4, 5, 6];
let [a, b, ... arr] = [1, 2, 3, 4, 5];
function fn(... args) { console.log(args); }
let { x, y, ... z } = { x: 1, y: 2, a: 3, b: 4 };
let n = { x, y, ... z };
此规则与 "never" 的正确代码示例：
¥Examples of correct code for this rule with "never":
/*eslint rest-spread-spacing: ["error", "never"]*/
fn(...args);
[...arr, 4, 5, 6];
let [a, b, ...arr] = [1, 2, 3, 4, 5];
function fn(...args) { console.log(args); }
let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
let n = { x, y, ...z };
“always”
使用 "always" 选项时，扩展运算符及其表达式之间需要空格。
¥When using the "always" option, whitespace is required between spread operators and their expressions.
rest-spread-spacing: ["error", "always"]
此规则与 "always" 的错误代码示例：
¥Examples of incorrect code for this rule with "always":
/*eslint rest-spread-spacing:["error", "always"]*/
fn(...args);
[...arr, 4, 5, 6];
let [a, b, ...arr] = [1, 2, 3, 4, 5];
function fn(...args) { console.log(args); }
let { x, y, ...z } = { x: 1, y: 2, a: 3, b: 4 };
let n = { x, y, ...z };
此规则与 "always" 的正确代码示例：
¥Examples of correct code for this rule with "always":
/*eslint rest-spread-spacing: ["error", "always"]*/
fn(... args);
[... arr, 4, 5, 6];
let [a, b, ... arr] = [1, 2, 3, 4, 5];
function fn(... args) { console.log(args); }
let { x, y, ... z } = { x: 1, y: 2, a: 3, b: 4 };
let n = { x, y, ... z };
何时不使用
¥When Not To Use It
如果你不关心在展开运算符及其表达式之间强制保持一致的间距，则可以安全地禁用此规则。
¥You can safely disable this rule if you do not care about enforcing consistent spacing between spread operators and their expressions.
版本
此规则是在 ESLint v2.12.0 中引入。