Observe Bus lifecycle and active/idle state.
Event-map typing is bivariant (no in out) so a surface over a wider map is assignable to a narrower view — the same Wide→Narrow shape as Bus.
in out
Readonly
Observe Bus lifecycle and active/idle state.
Event-map typing is bivariant (no
in out) so a surface over a wider map is assignable to a narrower view — the same Wide→Narrow shape as Bus.