node:diagnostics_channel

Publish/subscribe for instrumentation, entirely in-process, so it needs no WIT capability. Channels are interned by name: a publisher and a subscriber that never share a reference still meet on the same object.

TracingChannel is implemented in full – traceSync, tracePromise and traceCallback, with the start/end/asyncStart/asyncEnd/error sub-channels emitted in Node’s order.

Channel.bindStore accepts anything offering run(value, fn), which includes jco-std’s AsyncLocalStorage. Stores are therefore scoped synchronously: a bound store is visible while subscribers run and does not follow an await. See node:async_hooks for why.