The following line is commonly referenced in .htaccess examples for redirecting pages to your React/Vue app when using the respective router's history navigation.
RewriteRule ^index\.html$ - [L]
What does that hyphen after the regex mean? It looks like a rewrite target, but hyphen is not a path name I'm know about.
I looked through https://httpd.apache.org/docs/2.4/rewrite/ but I didn't find anything that told me what the hyphen means in this specific context.