Is there a way to prevent middleware from running on prerender=false routes? In cloudflare, the context.locals.runtime isn't available and it breaks my build
#prevent middleware from running on prerender=false routes
tired lion
devout narwhalBOT
Hi @tired lion. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
Based on the information provided in the extracts, it seems that the context.locals object is serialized and sent in a header for the serverless function when edgeMiddleware is enabled in Astro. This happens for all requests including static assets, prerendered pages, and on-demand rendered pages. However, there's no specific mention of a way to prevent middleware from running on routes where prerender is set to false.
If you're experiencing issues with context.locals.runtime not being available in Cloudflare, it might be due to the fact that the value of locals cannot be overridden at runtime. In dev mode, Astro performs checks and will throw an error if locals are overridden.
Here's the relevant extract from the Astro documentation:
# Documentation > En > Guides > Middleware > Basic Usage > Storing data in `context.locals` Part 2
The value of `locals` cannot be overridden at run time. Doing so would risk wiping out all the information stored by the user. In `dev` mode, Astro performs checks and will throw an error if `locals` are overridden.
If you're still having trouble, it might be worth checking out the Astro GitHub issues (https://github.com/withastro/astro/issues) to see if anyone else has encountered a similar problem or to open a new issue.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
tired lion
is there a way for me to check a astro variable check if in ssr or ssg mode
@devout narwhal is there a way for me to check a astro variable check if in ssr or ssg mode
devout narwhalBOT
Let me check the knowledge base for you. One moment! :books:
Yes, you can check if you're in SSR or SSG mode using the import.meta.env.SSR variable in Astro. This variable can be used to determine when rendering is happening on the server. Here's an example of how you can use it:
export default function () {
return import.meta.env.SSR ? <div class="spinner"></div> : <FancyComponent />;
}
In this example, if import.meta.env.SSR is true, it means you're in SSR mode and a spinner is rendered. If it's false, you're in SSG mode and a FancyComponent is rendered instead.
You can find more information about this in the Astro API Reference (https://docs.astro.build/en/reference/api-reference#importmeta).
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
tired lion
@devout narwhal does that work on a per route basis
devout narwhalBOT
Let me check the knowledge base for you. One moment! :books:
The import.meta.env.SSR variable is a global variable and it doesn't change on a per-route basis. It's set to true during server-side rendering and false otherwise. It doesn't provide information about the rendering mode of individual routes.
However, you can control the rendering mode of individual routes in Astro by using the output configuration in your astro.config.mjs file and the prerender export in your .astro files.
For example, if you set output: 'server' in your Astro config, your entire app will be server-rendered by default. You can then opt-in to pre-rendering for individual pages by exporting const prerender = true in those pages:
// src/pages/my-static-page.astro
---
export const prerender = true;
// ...
---
<html> <!-- Static, pre-rendered page here... --></html>
Conversely, if you set output: 'hybrid' in your Astro config, your app will be pre-rendered by default. You can then opt-out of pre-rendering for individual pages by exporting const prerender = false in those pages:
// src/pages/my-dynamic-page.astro
---
export const prerender = false;
// ...
---
<html> <!-- Dynamically server-rendered page here... --></html>