Add Copy Page button

[gaearon]

I really like that Next.js docs have a button like this so I figured maybe we can add one too?

I usually just use this to feed something specific into Claude when it struggles with an API or a concept.

copy.mov

[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

Five Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/404	126.96 KB (🟡 +483 B)	242.1 KB
/500	126.97 KB (🟡 +483 B)	242.11 KB
/[[...markdownPath]]	129.4 KB (🟡 +484 B)	244.54 KB
/errors	127.21 KB (🟡 +484 B)	242.35 KB
/errors/[errorCode]	127.19 KB (🟡 +483 B)	242.33 KB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 10% or more, there will be a red status indicator applied, indicating that special attention should be given to this.

[rickhanlonii]

Sick

[MaxwellCohen]

I was going to suggest using useTransition to manage the copied state notification. i.e. something like this

  const [copied, startTransition] = useTransition();

  async function handleCopy() {
    const cleanPath = asPath.split(/[?#]/)[0];
    try {
      const res = await fetch(cleanPath + '.md');
      if (!res.ok) return;
      const text = await res.text();
      await navigator.clipboard.writeText(text);
      startTransition(async() => {
        await new Promise((resolve) => setTimeout(resolve, 2000));
      });
    } catch {
      // Silently fail
    }
  }

If it is too late, feel free to disregard.