rsnext/errors/no-duplicate-head.md
Michael Novotny 5211ac5cae
Adds consistency to ESLint rules. (#34335)
* Adds consistency to ESLint rules.

* Fixes lint errors.

* Fixes manifest.

* Adds missing title.

* Fixes copy / paste error.

Co-authored-by: Lee Robinson <me@leerob.io>

* Update errors/no-script-in-document.md

Co-authored-by: Lee Robinson <me@leerob.io>

* Update errors/no-sync-scripts.md

Co-authored-by: Lee Robinson <me@leerob.io>

* Updates a couple of rule descriptions.

* Adds redirects.

* Fixes unit tests.

* Removes duplicated section.

* Updates `no-before-interactive-script-outside-document` description.

* Fixes lint.

* Fixes integration tests.

* Adds description to `no-before-interactive-script-outside-document` documentation.

* Removes `link-passhref` from rules list.

* Updates remaining `pages/_middleware.js` references.

* Adds consistancy to messaging in new `no-styled-jsx-in-document` rule.

* Apply suggestions from code review

* Apply suggestions from code review

Co-authored-by: Lee Robinson <me@leerob.io>
Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
Co-authored-by: JJ Kasper <jj@jjsweb.site>
2022-06-13 21:17:42 -05:00

859 B

No Duplicate Head

Prevent duplicate usage of <Head> in pages/_document.js.

Why This Error Occurred

More than a single instance of the <Head /> component was used in a single custom document. This can cause unexpected behavior in your application.

Possible Ways to Fix It

Only use a single <Head /> component in your custom document in pages/_document.js.

// pages/_document.js
import Document, { Html, Head, Main, NextScript } from 'next/document'

class MyDocument extends Document {
  static async getInitialProps(ctx) {
    //...
  }

  render() {
    return (
      <Html>
        <Head />
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    )
  }
}

export default MyDocument