noUselessLoneBlockStatements

诊断类别：lint/complexity/noUselessLoneBlockStatements

¥Diagnostic Category: lint/complexity/noUselessLoneBlockStatements

JavaScript (and super languages)

自从：v1.3.3

¥Since: v1.3.3

来源：

¥Sources:

与以下相同：no-lone-blocks

¥Same as: no-lone-blocks

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

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

  ✖ 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.

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

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

  ✖ 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

while (foo) {
  bar();
}

noUselessLoneBlockStatements

示例

无效

有效

相关链接