noConstructorReturn

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v1.0.0

¥Rule available since: v1.0.0
诊断类别：lint/correctness/noConstructorReturn

¥Diagnostic Category: lint/correctness/noConstructorReturn
此规则为推荐规则，默认启用。

¥This rule is recommended, which means is enabled by default.
此规则没有修复方案。

¥This rule doesn’t have a fix.
此规则的默认严重级别为 error。

¥The default severity of this rule is error.
来源：

¥Sources:
- 与 no-constructor-return 相同
  
  ¥Same as no-constructor-return

如何配置

¥How to configure

1
{
2
  "linter": {
3
    "rules": {
4
      "correctness": {
5
        "noConstructorReturn": "error"
6
      }
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    }
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  }
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}

描述

¥Description

禁止从 constructor 返回值。

¥Disallow returning a value from a constructor.

从类的 constructor 返回值可能是一个错误。禁止此模式可防止因不熟悉 JavaScript 或复制粘贴错误而导致的错误。

¥Returning a value from a constructor of a class is a possible error. Forbidding this pattern prevents errors resulting from unfamiliarity with JavaScript or a copy-paste error.

仅允许返回没有值，因为它是控制流语句。

¥Only returning without a value is allowed, as it’s a control flow statement.

示例

¥Examples

无效

¥Invalid

1
class A {
2
    constructor() {
3
        return 0;
4
    }
5
}

code-block.js:3:9 lint/correctness/noConstructorReturn ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ The constructor should not return a value.
  
    1 │ class A {
    2 │     constructor() {
  > 3 │         return 0;
      │         ^^^^^^^^^
    4 │     }
    5 │ }
  
  ℹ The constructor is here:
  
    1 │ class A {
  > 2 │     constructor() {
      │     ^^^^^^^^^^^^^^^
  > 3 │         return 0;
  > 4 │     }
      │     ^
    5 │ }
    6 │ 
  
  ℹ Returning a value from a constructor may confuse users of the class.

有效

¥Valid

1
class A {
2
    constructor() {}
3
}

1
class B {
2
    constructor(x) {
3
        return;
4
    }
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}

将此规则与单例模式结合使用

¥Using this rule in combination with the singleton pattern

有些人通过在构造函数中返回一个已存在的实例来实现 JavaScript 中的单例模式，这与此规则相冲突。

¥Some people implement the singleton pattern in JavaScript by returning an existing instance from the constructor, which would conflict with this rule.

相反，我们建议你遵循这篇博客文章中描述的建议之一：https://arendjr.nl/blog/2024/11/singletons-in-javascript/

¥Instead, we advise to follow one of the suggestions described in this blog post: https://arendjr.nl/blog/2024/11/singletons-in-javascript/

noConstructorReturn

摘要

如何配置

描述

示例

无效

有效

将此规则与单例模式结合使用

相关链接