Branch

1 VersionUtility

Conditional pass-through gate: takes a Bool predicate and a value of any type t, and emits Maybe<t> — the value wrapped as present when the predicate is true, or absent when false — preserving the stream cadence on both arms.

How it fits

Typical backends

Compute a predicate and a payload from inputs, gate the payload on the predicate, then serialize the optional result to JSON for a downstream service.

Forward records read from a JSONL file only when a separately-computed condition holds, dropping the rest as absent values.

Caveats

I/O contractThe output is always a Maybe<t> value, never a dropped tick: when the predicate is false an absent value is still emitted, so downstream consumers can distinguish predicate-false from no-message-yet.
OrderingThe predicate and the value must arrive on the same cadence; each pair produces exactly one optional output, so a mismatch in upstream rates misaligns which value each predicate gates.
I/O contractThe value type t is resolved from the wiring at deploy time and the emitted variant is tagged to match it, so a scalar value is re-wrapped into the optional shape rather than passed through raw.

Versions

45f6ffd9defaultlatest
Automated release
5/12/2026