Options a diagnostic can carry beyond its text. Both default to the CLI's long-standing behaviour, so only the handful of call sites that need something else say so.
optional
raw: boolean
Write the message verbatim rather than as a # -prefixed TAP comment. For pre-formatted
blocks — the coverage table, a stack trace — whose own layout is the point.
optional
stream: "output" | "error" | "both"
Which of the run's two streams the default rendering goes to. output by default.