RC Migration Guide Tracker

[delucis]

We’re going to want to document a few things in our migration guide, so I’m using this issue to keep track before we forget. Throw anything else you spot in here!

• If using <Markdown />, you need to install @astrojs/markdown-component and update your imports (see Remove references to the <Markdown> component #1045 and Move the Markdown component to its own package astro#3986)
• Vite 3 update (done in Add stub Release Candidate migration guide #1049)
• canonicalURL deprecation (see deprecate Astro.canonicalURL & add Astro.url #1033)
• Current component-in-markdown support will be behind legacy.astroFlavoredMarkdown flag (see Deprecating the "Authoring markdown" section and adding config docs for the new legacy flag #1090 Feat: new legacy.astroFlavoredMarkdown flag astro#4016)
• New output option (see Add the output option astro#4015)
• New .html support (see Add .html support astro#3867)
• Update getHeaders() to getHeadings(). Double check if we mentioned astro.content.headers
• Update references to Markdown content to use frontmatter (when @bholmesdev’s done it!)

[sarah11918]

I'm guessing that Ben's legacy.astroFlavoredMarkdown PR will need some migration guide content re: no more components, variables etc. in Markdown

withastro/astro#4016

[sarah11918]

I did just add RSS feeds are now generated with @astrojs/rss to the migration guide.

[delucis]

Closing as complete now we have #1418 to track the outstanding task.