useSingleVarDeclarator

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/style/useSingleVarDeclarator

¥Diagnostic Category: lint/style/useSingleVarDeclarator
此规则包含 unsafe 修复程序。

¥This rule has an unsafe 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 one-var 相同
  
  ¥Same as one-var

如何配置

¥How to configure

1
{
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  "linter": {
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    "rules": {
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      "style": {
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        "useSingleVarDeclarator": "error"
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      }
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    }
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  }
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}

描述

¥Description

禁止在同一个变量语句中声明多个变量

¥Disallow multiple variable declarations in the same variable statement

在 JavaScript 中，可以在单个 var、const 或 let 声明中声明多个变量。通常认为，最好分别声明每个变量。这就是此规则所强制执行的。

¥In JavaScript, multiple variables can be declared within a single var, const or let declaration. It is often considered a best practice to declare every variable separately. That is what this rule enforces.

示例

¥Examples

无效

¥Invalid

1
let foo = 0, bar, baz;

code-block.js:1:1 lint/style/useSingleVarDeclarator  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Declare variables separately
  
  > 1 │ let foo = 0, bar, baz;
      │ ^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Unsafe fix: Break out into multiple declarations
  
    1   │ - let·foo·=·0,·bar,·baz;
      1 │ + let·foo·=·0;
      2 │ + let·bar;
      3 │ + let·baz;
    2 4 │

有效

¥Valid

1
const foo = 0;
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let bar;
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let baz;

1
for (let i = 0, x = 1; i < arr.length; i++) {}

useSingleVarDeclarator

摘要

如何配置

描述

示例

无效

有效

相关链接