semi

要求或禁止使用分号而不是 ASI

一些该规则报告的问题可以通过 --fix 命令行选项自动修复

JavaScript 不需要在每条语句的末尾使用分号。在许多情况下，JavaScript 引擎可以确定分号应该在某个位置并自动添加它。此功能称为自动分号插入 (ASI)，被认为是 JavaScript 中更具争议的功能之一。例如，以下行都是有效的：

var name = "ESLint"
var website = "eslint.org";

在第一行，JavaScript 引擎会自动插入一个分号，所以这不被认为是语法错误。JavaScript 引擎仍然知道如何解释该行，并且知道行尾表示语句的结束。

在关于 ASI 的争论中，通常有两种思想流派。首先是我们应该将 ASI 视为不存在，并始终手动包含分号。基本原理是始终包含分号比尝试记住何时需要或不需要分号更容易，从而降低了引入错误的可能性。

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return
{
    name: "ESLint"
};

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return;
{
    name: "ESLint";
}

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var globalCounter = { }

(function () {
    var n = 0
    globalCounter.increment = function () {
        return ++n
    }
})()

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该语句有一个未闭合的括号、数组字面量或对象字面量，或者以某种不是结束语句的有效方式的其他方式结束。（例如，以 . 或 , 结尾。）
该行是 -- 或 ++（在这种情况下，它将递减/递增下一个令牌。）
它是 for()、while()、do、if() 或 else，没有 {
下一行以 [、(、+、*、/、-、,、. 或其他只能在单个表达式中的两个标记之间找到的二元运算符开头。

规则详情

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选项

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23S1pJ3ZG0WKE8rk/B4jYWVJGFgKOTEvKZNFjNm5nIs=

Ea+s3QJASFaHl1uNHE6uI/P4eFq/W6rNRx66EQcgCIOuyw8+JaIzP9KC/cupiQTDu/H5losF1ird3z8xeZOR5adAw8pSByVX0nhp0hEpZ+mENSD+zAm7CBZpybErR36xfU9QNFNl8B7j6aPgpm1t3bz1cY4CU3d4+fNsQzdSzdlC72g4n1H9cSNe5b+uQFFfodLm/B/s7TDug/AR/tN+emvGZ0nPo+9SeELfbklRWgdsWxPGQfIrLevfU1vio2JRauBYn3FBdzXS1qtZnOettUsMR57N2ekU0rdHJWfNxDoehJMqHbUNGK3OsdPWH0vfxLtCYdBd7mtcmgPu3hzO7W34vkaJF4pXRyi3+gZi4DTP1/ehYNI6cO0dOTjdrUQg

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CNfDKZwCYvH2RuAEZGGCnQQUxlVSGr9yt6YndBgjTM+UD3R75Zr/oxgRTef+/kKX

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always

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/*eslint semi: ["error", "always"]*/

var name = "ESLint"

object.method = function() {
    // ...
}

class Foo {
    bar = 1
}

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/*eslint semi: "error"*/

var name = "ESLint";

object.method = function() {
    // ...
};

class Foo {
    bar = 1;
}

never

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/*eslint semi: ["error", "never"]*/

var name = "ESLint";

object.method = function() {
    // ...
};

class Foo {
    bar = 1;
}

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/*eslint semi: ["error", "never"]*/

var name = "ESLint"

object.method = function() {
    // ...
}

var name = "ESLint"

;(function() {
    // ...
})()

import a from "a"
(function() {
    // ...
})()

import b from "b"
;(function() {
    // ...
})()

class Foo {
    bar = 1
}

omitLastInOneLineBlock

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/*eslint semi: ["error", "always", { "omitLastInOneLineBlock": true}] */

if (foo) { bar() }

if (foo) { bar(); baz() }

function f() { bar(); baz() }

class C {
    foo() { bar(); baz() }

    static { bar(); baz() }
}

beforeStatementContinuationChars

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/*eslint semi: ["error", "never", { "beforeStatementContinuationChars": "always"}] */
import a from "a"

(function() {
    // ...
})()

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/*eslint semi: ["error", "never", { "beforeStatementContinuationChars": "never"}] */
import a from "a"

;(function() {
    // ...
})()

何时不使用

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