EventMeta
typeOpaque, optional envelope metadata carried alongside an Event.
The store never reads, validates or acts on this, it only carries it end to end, so
reducers, middleware, effects, event subscribers and instrumentation all observe the same
value. It is deliberately untyped at this level: consumers namespace their own keys (for
example a tracing integration keeping provenance under
meta.trace) rather than
extending core with domain concepts.
It is **not** part of the deduplication fingerprint, which is computed from
(channel, type, payload) only. Two events differing solely in meta still dedupe.Definition
type
type EventMeta = Readonly<Record<string, unknown>>Readonly<Record<string, unknown>>