useSolidForComponent

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JavaScript (and super languages)

Summary

Rule available since: v2.0.0
Diagnostic Category: lint/performance/useSolidForComponent
This rule doesn’t have a fix.
The default severity of this rule is information.
This rule belongs to the following domains:
- solid
Sources:
- Inspired from solidjs/prefer-for

How to configure

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{
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  "linter": {
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    "rules": {
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      "performance": {
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        "useSolidForComponent": "error"
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      }
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    }
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  }
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}

Description

Enforce using Solid’s <For /> component for mapping an array to JSX elements.

In Solid, <For /> component for efficiently rendering lists. Array#map causes DOM elements to be recreated.

For details on <For /> Component, see the Solid docs about Components.

Examples

Invalid

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let Component = (props) => <ol>{props.data.map(d => <li>{d.text}</li>)}</ol>;

code-block.jsx:1:33 lint/performance/useSolidForComponent ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Array.prototype.map will cause DOM elements to be recreated, it is not recommended to use it in Solid here.
  
  > 1 │ let Component = (props) => <ol>{props.data.map(d => <li>{d.text}</li>)}</ol>;
      │                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Use Solid’s <For /> component for efficiently rendering lists. See Solid docs for more details.

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let Component = (props) => <>{props.data.map(d => <li>{d.text}</li>)}</>;

code-block.jsx:1:31 lint/performance/useSolidForComponent ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Array.prototype.map will cause DOM elements to be recreated, it is not recommended to use it in Solid here.
  
  > 1 │ let Component = (props) => <>{props.data.map(d => <li>{d.text}</li>)}</>;
      │                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Use Solid’s <For /> component for efficiently rendering lists. See Solid docs for more details.

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let Component = (props) => (
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  <ol>
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    {props.data.map((d) => (
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      <li key={d.id}>{d.text}</li>
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    ))}
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  </ol>
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);

code-block.jsx:3:6 lint/performance/useSolidForComponent ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ℹ Array.prototype.map will cause DOM elements to be recreated, it is not recommended to use it in Solid here.
  
    1 │ let Component = (props) => (
    2 │   <ol>
  > 3 │     {props.data.map((d) => (
      │      ^^^^^^^^^^^^^^^^^^^^^^^
  > 4 │       <li key={d.id}>{d.text}</li>
  > 5 │     ))}
      │     ^^
    6 │   </ol>
    7 │ );
  
  ℹ Use Solid’s <For /> component for efficiently rendering lists. See Solid docs for more details.

Valid

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let Component = (props) => <ol><For each={props.data}>{d => <li>{d.text}</li>}</For></ol>;

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let abc = x.map(y => y + z);

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let Component = (props) => {
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 let abc = x.map(y => y + z);
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 return <div>Hello, world!</div>;
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}