noDuplicateProperties

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Diagnostic Category: lint/nursery/noDuplicateProperties

Since: v1.9.4

Sources:

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

Description

Disallow duplicate properties within declaration blocks.

This rule checks the declaration blocks for duplicate properties. It ignores custom properties.

Examples

Invalid

a {
  color: pink;
  color: orange;
}

code-block.css:3:3 lint/nursery/noDuplicateProperties ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Duplicate properties can lead to unexpected behavior and may override previous declarations unintentionally.
  
    1 │ a {
    2 │   color: pink;
  > 3 │   color: orange;
      │   ^^^^^
    4 │ }
    5 │ 
  
  ℹ color is already defined here.
  
    1 │ a {
  > 2 │   color: pink;
      │   ^^^^^
    3 │   color: orange;
    4 │ }
  
  ℹ Remove or rename the duplicate property to ensure consistent styling.

Valid

a {
  color: pink;
  background: orange;
}

How to configure

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