pub fn constant(name: &str) -> Option<Value>Expand description
Non-function members of the diagnostics_channel namespace, exposed as
constructor values for instanceof/typeof checks. Reachable via
namespace_property IF the parent routes "diagnostics_channel" into
stdlib::constant. The channel objects themselves come from channel() /
tracingChannel(); these bare constructors are not directly instantiable
(Node’s Channel constructor also throws) — they exist so the names resolve.