noExcessiveClassesPerFile

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JavaScript (and super languages)

Summary

Rule available since: v2.3.12
Diagnostic Category: lint/nursery/noExcessiveClassesPerFile
This rule doesn’t have a fix.
The default severity of this rule is information.
Sources:
- Same as max-classes-per-file

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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        "noExcessiveClassesPerFile": "error"
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      }
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    }
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  }
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}

Description

Enforce a maximum number of classes per file.

Files containing multiple classes can often result in a less navigable and poorly structured codebase. Best practice is to keep each file limited to a single responsibility.

Examples

Invalid

1
class Foo {}
2
class Bar {}

code-block.js:1:1 lint/nursery/noExcessiveClassesPerFile ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ File exceeds the maximum of 1 class, found 2 classes.
  
  > 1 │ class Foo {}
      │ ^^^^^^^^^^^^
  > 2 │ class Bar {}
      │ ^^^^^^^^^^^^
    3 │ 
  
  ℹ Files containing multiple classes can often result in a less navigable and poorly structured codebase. Extract the excessive classes into a separate file.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.

Valid

1
class Foo {}

Options

The following options are available:

`maxClasses`

This option sets the maximum number of classes allowed in a file. If the file exceeds this limit, a diagnostic will be reported.

Default: 1

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{
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  "linter": {
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    "rules": {
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      "nursery": {
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        "noExcessiveClassesPerFile": {
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          "options": {
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            "maxClasses": 2
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          }
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        }
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      }
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    }
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  }
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}

1
class Foo {}
2
class Bar {}
3
class Baz {}

code-block.js:1:1 lint/nursery/noExcessiveClassesPerFile ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ File exceeds the maximum of 2 classes, found 3 classes.
  
  > 1 │ class Foo {}
      │ ^^^^^^^^^^^^
  > 2 │ class Bar {}
  > 3 │ class Baz {}
      │ ^^^^^^^^^^^^
    4 │ 
  
  ℹ Files containing multiple classes can often result in a less navigable and poorly structured codebase. Extract the excessive classes into a separate file.
  
  ℹ This rule belongs to the nursery group, which means it is not yet stable and may change in the future. Visit https://biomejs.dev/linter/#nursery for more information.