terribleplan/next.js
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next.js/errors/no-document-title.md
Luc f8dfe026ec Show warning if there is a title in _document.js's Head (#5160) 
* show warning if there is a title in _document.js Head

* dont loop through children in production

* only 1 loop through this.props.children 💪

* also raise warning in test env

* check for null childs
2018-09-28 00:24:12 +02:00

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<title> should not be used in _document.js's <Head>

Why This Error Occurred

Adding <title> in pages/_document.js will lead to unexpected results with next/head since _document.js is only rendered on the initial pre-render.

Possible Ways to Fix It

Set <title> in pages/_app.js instead :

// pages/_app.js
import App, {Container} from 'next/app'
import Head from 'next/head'
import React from 'react'

export default class MyApp extends App {
  static async getInitialProps ({ Component, router, ctx }) {
    let pageProps = {}

    if (Component.getInitialProps) {
      pageProps = await Component.getInitialProps(ctx)
    }

    return {pageProps}
  }

  render () {
    const {Component, pageProps} = this.props
    return <Container>
      <Head>
        <title>My new cool app</title>
      </Head>
      <Component {...pageProps} />
    </Container>
  }
}

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