Astro glob method signature overload for unusual markdown types

[steve-fenton-octopus]

Body

Summary

The glob method signature allows a glob for .astro, .md, or .mdx - but it doesn't currently allow more complex glob strings, even though they work.

    glob(globStr: `${any}.astro`): Promise<AstroInstance[]>;
    glob<T extends Record<string, any>>(globStr: `${any}${MarkdowFileExtension}`): Promise<MarkdownInstance<T>[]>;
    glob<T extends Record<string, any>>(globStr: `${any}.mdx`): Promise<MDXInstance<T>[]>;
    glob<T extends Record<string, any>>(globStr: string): Promise<T[]>;

For example, if you have a mix of .md and .mdx you might use *.md*.

This currently issues a warning as No overload matches this call.

Background & Motivation

I'm working on a site that has ~1,000 markdown files, and a smaller number of .mdx files as they need to import sub-content. Others using a mix of extensions would see this error.

Goals

The goal of this RFC is to see if there's an acceptable way to have an error-free way to call the glob function for mixed file types.

Example

  const sourcePosts = await Astro.glob(['../../**/*.md*']) as MarkdownInstance[];