A polymode for Astro components.
It requires for you to have web-mode and polymode installed.
This works ok-ish for most of my use-cases. There's a small issue on which syntax highlighting does not show up until you start editing a specific section, but the mode switching and indentation seems to work without any issues.
Require the package and load it for astro files:
(add-to-list 'auto-mode-alist '("\\.astro\\'" . poly-astro))Any .astro file you open now should be properly highlighted and use the correct modes per section.