noDuplicatedSpreadProps

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JavaScript (and super languages)

Summary

Rule available since: v2.3.8
Diagnostic Category: lint/nursery/noDuplicatedSpreadProps
This rule doesn’t have a fix.
The default severity of this rule is information.
This rule belongs to the following domains:
- react
- solid
Sources:
- Same as react/jsx-props-no-spread-multi

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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        "noDuplicatedSpreadProps": "error"
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      }
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    }
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  }
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}

Description

Disallow JSX prop spreading the same identifier multiple times.

Enforces that any unique expression is only spread once. Generally spreading the same expression twice is an indicator of a mistake since any attribute between the spreads may be overridden when the intent was not to. Even when that is not the case this will lead to unnecessary computations being performed.

Examples

Invalid

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<div {...props} something="else" {...props} />

code-block.jsx:1:1 lint/nursery/noDuplicatedSpreadProps ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ The expression props has spread more than once.
  
  > 1 │ <div {…props} something=“else” {…props} />
      │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Spreading an expression more than once will lead to unnecessary computations being performed. Reduce spreads of this expression down to 1.

Valid

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<div something="else" {...props} />