Frontend & browser·Modules, bundling and the build
the file is named with a string of hex that changes only when its contents change.
Content hash
Also calledfingerprint, contenthash
A hash of a file's contents embedded in its filename, so a given URL always maps to exactly one version of the file. It is what makes it safe to cache an asset forever, because a new version is a new URL rather than the same URL with new bytes. It only works if the HTML referring to it is not cached the same way, which is the mistake that pins users to an old build.