ReadonlybytesThe artefact bytes, or undefined when the read did not produce them.
Optional ReadonlycauseThe underlying read failure when bytes is absent because the read
THREW (ENOENT / permission / network). Absent when the read succeeded,
or when it was an HTTP-non-ok miss (no JS error to attribute).
The outcome of an artefact read.
bytespresent ⇒ the artefact was read.bytesabsent carries the underlyingcausewhen the read FAILED (a thrownfs.readFile/fetch, e.g. ENOENT or a network error); thecauseis absent only when the fetch itself succeeded but the HTTP status was non-ok (a legitimate "artefact not served here" with no JS error to attribute).