noUselessLoneBlockStatements

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v1.3.3

¥Rule available since: v1.3.3
诊断类别：lint/complexity/noUselessLoneBlockStatements

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

¥This rule is recommended, which means is enabled by default.
此规则包含 safe 修复程序。

¥This rule has a safe fix.
此规则的默认严重级别为 information。

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

¥Sources:
- 与 no-lone-blocks 相同
  
  ¥Same as no-lone-blocks

如何配置

¥How to configure

1
{
2
  "linter": {
3
    "rules": {
4
      "complexity": {
5
        "noUselessLoneBlockStatements": "error"
6
      }
7
    }
8
  }
9
}

描述

¥Description

禁止不必要的嵌套块语句。

¥Disallow unnecessary nested block statements.

在 ES6 之前的 JavaScript 中，用大括号分隔的独立代码块不会创建新的作用域，也没有用处。在 ES6 中，如果存在块级绑定（let 和 const）、类声明或函数声明（在严格模式下），则代码块可能会创建新的范围。在这些情况下，块不被视为多余的。

¥In JavaScript, prior to ES6, standalone code blocks delimited by curly braces do not create a new scope and have no use. In ES6, code blocks may create a new scope if a block-level binding (let and const), a class declaration or a function declaration (in strict mode) are present. A block is not considered redundant in these cases.

示例

¥Examples

无效

¥Invalid

1
{}

code-block.js:1:1 lint/complexity/noUselessLoneBlockStatements ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ This block statement doesn’t serve any purpose and can be safely removed.
  
  > 1 │ {}
      │ ^^
    2 │ 
  
  ℹ Standalone block statements without any block-level declarations are redundant in JavaScript and can be removed to simplify the code.

1
if (foo) {
2
  bar();
3
  {
4
    baz();
5
  }
6
}

code-block.js:3:3 lint/complexity/noUselessLoneBlockStatements  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ This block statement doesn’t serve any purpose and can be safely removed.
  
    1 │ if (foo) {
    2 │   bar();
  > 3 │   {
      │   ^
  > 4 │     baz();
  > 5 │   }
      │   ^
    6 │ }
    7 │ 
  
  ℹ Standalone block statements without any block-level declarations are redundant in JavaScript and can be removed to simplify the code.
  
  ℹ Safe fix: Remove redundant block.
  
    1 1 │   if (foo) {
    2 2 │     bar();
    3   │ - ··{
    4 3 │       baz();
    5   │ - ··}
    6 4 │   }
    7 5 │

有效

¥Valid

1
while (foo) {
2
  bar();
3
}

noUselessLoneBlockStatements

摘要

如何配置

描述

示例

无效

有效

相关链接