noDuplicateCustomProperties

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Diagnostic Category: lint/nursery/noDuplicateCustomProperties

Since: v1.9.0

Sources:

Same as: stylelint/declaration-block-no-duplicate-custom-properties

Description

Disallow duplicate custom properties within declaration blocks.

This rule checks the declaration blocks for duplicate custom properties.

Examples

Invalid

a { --custom-property: pink; --custom-property: orange;  }

code-block.css:1:30 lint/nursery/noDuplicateCustomProperties ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Duplicate custom properties can lead to unexpected behavior and may override previous declarations unintentionally.
  
  > 1 │ a { —custom-property: pink; —custom-property: orange;  }
      │                              ^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ —custom-property is already defined here.
  
  > 1 │ a { —custom-property: pink; —custom-property: orange;  }
      │     ^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Remove or rename the duplicate custom property to ensure consistent styling.

a { --custom-property: pink; background: orange; --custom-property: orange }

code-block.css:1:50 lint/nursery/noDuplicateCustomProperties ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Duplicate custom properties can lead to unexpected behavior and may override previous declarations unintentionally.
  
  > 1 │ a { —custom-property: pink; background: orange; —custom-property: orange }
      │                                                  ^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ —custom-property is already defined here.
  
  > 1 │ a { —custom-property: pink; background: orange; —custom-property: orange }
      │     ^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Remove or rename the duplicate custom property to ensure consistent styling.

Valid

a { --custom-property: pink; }

a { --custom-property: pink; --cUstOm-prOpErtY: orange; }

How to configure

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