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Version: v0.0.4

Function: downgradePositiveAck()

downgradePositiveAck(code): AckCode

Downgrade a positive acknowledgment code to its matching error code, AA → AE (original mode), CA → CE (enhanced mode). Every other code passes through unchanged.

This is the single upstream source of truth for the fail-safe downgrade pair: buildAck applies it when the inbound carries no MSH-10 correlation id, and @cosyte/mllp's ack-from-hl7 adapter applies it when the inbound cannot be parsed at all: neither ever fabricates an unverifiable positive acknowledgment, and neither carries its own copy of the mapping.

Parameters​

code​

AckCode

Returns​

AckCode

Example​

import { downgradePositiveAck } from "@cosyte/hl7";
downgradePositiveAck("AA"); // "AE"
downgradePositiveAck("CA"); // "CE"
downgradePositiveAck("AR"); // "AR" (unchanged)