useDefaultSwitchClause

이 콘텐츠는 아직 번역되지 않았습니다.

JavaScript (and super languages)

Summary

Rule available since: v1.7.2
Diagnostic Category: lint/style/useDefaultSwitchClause
This rule isn’t recommended, so you need to enable it.
This rule doesn’t have a fix.
The default severity of this rule is warning.
Sources:
- Same as default-case

How to configure

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{
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  "linter": {
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    "rules": {
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      "style": {
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        "useDefaultSwitchClause": "error"
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      }
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    }
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  }
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}

Description

Require the default clause in switch statements.

Some code conventions require that all switch statements have a default clause. The thinking is that it’s better to always explicitly state what the default behavior should be so that it’s clear whether or not the developer forgot to include the default behavior by mistake.

Examples

Invalid

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switch (a) {
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    case 1:
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        /* code */
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        break;
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}

code-block.js:1:1 lint/style/useDefaultSwitchClause ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Expected a default switch clause.
  
  > 1 │ switch (a) {
      │ ^^^^^^^^^^^^
  > 2 │     case 1:
  > 3 │         /* code */
  > 4 │         break;
  > 5 │ }
      │ ^
    6 │ 
  
  ℹ The lack of a default clause can be a possible omission.
  
  ℹ Consider adding a default clause.

Valid

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switch (a) {
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    case 1:
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        /* code */
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        break;
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    default:
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        /* code */
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        break;
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}