@gatsbyjs/parcel-namer-relative-to-cwd

Parcel by default is trying to find common/shared directory between entries and output paths are impacted by it. See https://github.com/parcel-bundler/parcel/issues/5476#issuecomment-769058504.

With these inputs files:

a.html
sub/b.html

You get:

• parcel build a.html => dist/a.html
• parcel build sub/b.html => dist/b.html
• parcel build a.html sub/b.html => dist/a.html, dist/sub/b.html

We can see that sub/b.html entry might result in either dist/b.html or dist/sub/b.html (depending wether a.html is entry or not). This makes builds not deterministic, which is very problematic where entries are "optional".

This namer plugin stabilize output, so inside distDir the hierarchy is the same as entry file in relation to current working directory (CWD):

• parcel build a.html => dist/a.html
• parcel build sub/b.html => dist/sub/b.html
• parcel build a.html sub/b.html => dist/a.html, dist/sub/b.html