Next.js: Viewport meta tag not being deduplicated

Created on 3 Oct 2019  路  1Comment  路  Source: vercel/next.js

Bug report

Describe the bug

Default viewport tag is being appended to and not replaced whenever you use define your own custom viewport tag.

To Reproduce

Define a simple _app.tsx that attempts to set a custom viewport meta tag.

import App from 'next/app'
import Head from 'next/head'

class MyApp extends App {
  render() {
    const { Component, pageProps } = this.props

    return (
      <>
        <Head>
          <title>Some Title</title>
          <meta name="viewport" content="this-is-from-app.tsx" key="viewport" />
        </Head>
        <Component {...pageProps} />
      </>
    )
  }
}

export default MyApp

Expected behavior

I expected the default viewport tag to be deduplicated and replaced.

Screenshots

image

System information

  • OS: macOS
  • Browser (if applies): Chrome
  • Version of Next.js: 9.0.7

Additional context

After doing some searching, it looks to me like the initial tag is coming from https://github.com/zeit/next.js/blob/2ba352da39ee00b6595aecdc9ffb2f103e803a85/packages/next/next-server/lib/head.tsx#L11-L23 and is not properly being deduplicated. It doesn't seem to matter if you define the same key.

good first issue needs investigation
Source
picture sdornan
👍5

Most helpful comment

Would like to work on this! Will investigate and send a PR.

picture melanieseltzer on 4 Oct 2019
👍5 ❤1

>All comments

Would like to work on this! Will investigate and send a PR.

melanieseltzer picture melanieseltzer on 4 Oct 2019
👍5 ❤1
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