noBeforeInteractiveScriptOutsideDocument

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JSX and TSX

Summary

Diagnostic Category: lint/nursery/noBeforeInteractiveScriptOutsideDocument
This rule doesn’t have a fix.
The default severity of this rule is warning.
This rule belongs to the following domains:
- next
Sources:
- Same as @next/next/no-before-interactive-script-outside-document

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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        "noBeforeInteractiveScriptOutsideDocument": "error"
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      }
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    }
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  }
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}

Description

Prevent usage of next/script’s beforeInteractive strategy outside of pages/_document.js in a Next.js project.

Next.js provides a next/script component to optimize the loading of third-party scripts. Using the beforeInteractive strategy allows scripts to be preloaded before any first-party code. beforeInteractive scripts must be placed in pages/_document.js.

This rule checks for any usage of the beforeInteractive scripts outside of these files.

Examples

Invalid

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import Script from 'next/script'
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export default function Index() {
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  return (
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    <div>
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      <Script
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        src="https://example.com/script.js"
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        strategy="beforeInteractive"
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      ></Script>
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    </div>
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  )
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}

code-block.jsx:7:7 lint/nursery/noBeforeInteractiveScriptOutsideDocument ━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Don’t use next/script component with the `beforeInteractive` strategy outside of pages/_document.js.
  
     5 │   return (
     6 │     <div>
   > 7 │       <Script
       │       ^^^^^^^
   > 8 │         src=“https://example.com/script.js”
   > 9 │         strategy=“beforeInteractive”
  > 10 │       ></Script>
       │       ^
    11 │     </div>
    12 │   )
  
  ℹ See the Next.js docs for more details.
  
  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.

Valid

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import { Html, Head, Main, NextScript } from 'next/document'
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import Script from 'next/script'
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export default function Document() {
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    return (
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        <Html>
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            <Head />
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            <body>
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                <Main />
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                <NextScript />
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                <Script
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                  src="https://example.com/script.js"
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                  strategy="beforeInteractive"
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                ></Script>
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            </body>
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        </Html>
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    )
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}