noJsxLeakedDollar

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JSX and TSX

Summary

Diagnostic Category: lint/nursery/noJsxLeakedDollar
This rule has an unsafe fix.
The default severity of this rule is warning.
This rule belongs to the following domains:
- react
Sources:
- Same as react-jsx/no-leaked-dollar
- Same as @eslint-react/jsx-no-leaked-dollar

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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        "noJsxLeakedDollar": "error"
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      }
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    }
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  }
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}

Description

Flags text nodes with a trailing $ before a JSX expression.

This can happen when refactoring from a template literal to JSX and forgetting to remove the dollar sign. This results in an unintentional $ being rendered as text in the output.

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function MyComponent({ user }) {
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  return `Hello ${user.name}`;
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}

When refactored to JSX, it might look like this:

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function MyComponent({ user }) {
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  return <>Hello ${user.name}</>;
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}

However, the $ before {user.name} is unnecessary and will be rendered as text in the output.

Examples

Invalid

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function MyComponent({ user }) {
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  return <div>Hello ${user.name}</div>;
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}

code-block.jsx:2:21 lint/nursery/noJsxLeakedDollar  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Possible unintentional ’$’ before a JSX expression.
  
    1 │ function MyComponent({ user }) {
  > 2 │   return <div>Hello ${user.name}</div>;
      │                     ^
    3 │ }
    4 │ 
  
  ℹ This ’$’ will be rendered as text. Remove the ’$’ from the text node or add a suppression if it is intentional.
  
  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.
  
  ℹ Unsafe fix: Remove dollar sign.
  
    2 │ ··return·<div>Hello·${user.name}</div>;
      │                     -

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function MyComponent({ user }) {
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  return <div>${user.name} is your name</div>;
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}

code-block.jsx:2:15 lint/nursery/noJsxLeakedDollar  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Possible unintentional ’$’ before a JSX expression.
  
    1 │ function MyComponent({ user }) {
  > 2 │   return <div>${user.name} is your name</div>;
      │               ^
    3 │ }
    4 │ 
  
  ℹ This ’$’ will be rendered as text. Remove the ’$’ from the text node or add a suppression if it is intentional.
  
  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.
  
  ℹ Unsafe fix: Remove dollar sign.
  
    2 │ ··return·<div>${user.name}·is·your·name</div>;
      │               -

Valid

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function MyComponent({ user }) {
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  return <div>Hello {user.name}</div>;
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}

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// A lone `$` before a single expression is treated as intentional (e.g. a price).
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function MyComponent({ price }) {
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  return <div>${price}</div>;
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}