noUselessCatchBinding

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v2.2.3

¥Rule available since: v2.2.3
诊断类别：lint/nursery/noUselessCatchBinding

¥Diagnostic Category: lint/nursery/noUselessCatchBinding
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.

如何配置

¥How to configure

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{
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  "linter": {
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    "rules": {
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      "nursery": {
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        "noUselessCatchBinding": "error"
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      }
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    }
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  }
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}

描述

¥Description

禁止使用未使用的 catch 绑定。

¥Disallow unused catch bindings.

此规则禁止根据 ECMAScript 2019 使用不必要的 catch 绑定。另请参阅：ECMAScript 2019 语言规范中的“可选 catch 绑定”特性。

¥This rule disallows unnecessary catch bindings in accordance with ECMAScript 2019. See also: the ECMAScript 2019 “optional catch binding” feature in the language specification.

示例

¥Examples

无效

¥Invalid

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try {
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    // Do something
3
} catch (unused) {}

code-block.js:3:9 lint/nursery/noUselessCatchBinding  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ This catch binding is unused.
  
    1 │ try {
    2 │     // Do something
  > 3 │ } catch (unused) {}
      │         ^^^^^^^^
    4 │ 
  
  ℹ Since ECMAScript 2019, catch bindings are optional; you can omit the catch binding if you don’t need it.
  
  ℹ Unsafe fix: Remove the catch binding.
  
    3 │ }·catch·(unused)·{}
      │         ---------

1
try {
2
    // Do something
3
} catch ({ unused }) {}

code-block.js:3:9 lint/nursery/noUselessCatchBinding  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ This catch binding is unused.
  
    1 │ try {
    2 │     // Do something
  > 3 │ } catch ({ unused }) {}
      │         ^^^^^^^^^^^^
    4 │ 
  
  ℹ Since ECMAScript 2019, catch bindings are optional; you can omit the catch binding if you don’t need it.
  
  ℹ Unsafe fix: Remove the catch binding.
  
    3 │ }·catch·({·unused·})·{}
      │         -------------

1
try {
2
    // Do something
3
} catch ({ unused1, unused2 }) {}

code-block.js:3:9 lint/nursery/noUselessCatchBinding  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ This catch binding is unused.
  
    1 │ try {
    2 │     // Do something
  > 3 │ } catch ({ unused1, unused2 }) {}
      │         ^^^^^^^^^^^^^^^^^^^^^^
    4 │ 
  
  ℹ Since ECMAScript 2019, catch bindings are optional; you can omit the catch binding if you don’t need it.
  
  ℹ Unsafe fix: Remove the catch binding.
  
    3 │ }·catch·({·unused1,·unused2·})·{}
      │         -----------------------

有效

¥Valid

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try {
2
    // Do something
3
} catch (used) {
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    console.error(used);
5
}

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try {
2
    // Do something
3
} catch ({ used }) {
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    console.error(used);
5
}

1
try {
2
    // Do something
3
} catch ({ used, unused }) {
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    console.error(used);
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}

1
try {
2
    // Do something
3
} catch {}

noUselessCatchBinding

摘要

如何配置

描述

示例

无效

有效

相关链接