Assert the parsed result satisfies predicate — the general form, for checking rich detail (e.g. (r) => r.kind === "ok" && r.value.files.length > 0).
predicate
(r) => r.kind === "ok" && r.value.files.length > 0
Optional
Assert the parsed result satisfies
predicate— the general form, for checking rich detail (e.g.(r) => r.kind === "ok" && r.value.files.length > 0).