useSingleVarDeclarator

诊断类别：lint/style/useSingleVarDeclarator

¥Diagnostic Category: lint/style/useSingleVarDeclarator

JavaScript (and super languages)

自从：v1.0.0

¥Since: v1.0.0

来源：

¥Sources:

与以下相同：one-var

¥Same as: one-var

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

let foo = 0, bar, baz;

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

  ✖ 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

const foo = 0;
let bar;
let baz;

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

useSingleVarDeclarator

示例

无效

有效

相关链接