/**
 * Two helpers for an unknown thrown value: what to say about it, and whether it is the
 * failure a caller was waiting for.
 *
 * Extensions report a rejected promise, a failed child process, and a parser error the
 * same way: an `Error` yields its message, and anything else is stringified. A `code` —
 * `EEXIST`, `EPERM` — is what a filesystem write branches on, and reading it off an
 * unknown value is the same boundary, so it lives here too. Kept value-only so every
 * caller has one definition.
 */

/** A user-facing message for an unknown thrown value. */
export function messageOf(error: unknown): string {
	return error instanceof Error ? error.message : String(error);
}

/** Whether an unknown thrown value carries one errno code, such as `EEXIST`. */
export function hasErrorCode(error: unknown, code: string): boolean {
	return typeof error === "object" && error !== null && (error as { code?: unknown }).code === code;
}