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Version: v0.0.2

Interface: Build834Spec

The full input to "./build-834.js".build834: the envelope, the header, and ≥ 1 member loop. A well-formed spec round-trips through get834Header / get834Enrollments field-for-field; a spec with an unknown maintenance type or a missing member loop is REFUSED with an "./build-errors.js".Enrollment834BuildError.

Example​

import { build834, type Build834Spec } from "@cosyte/x12";
const spec: Build834Spec = {
  envelope: {
    senderId: "EMPLOYERCO", receiverId: "MEDPAY",
    interchangeDate: "260601", interchangeTime: "1200",
    interchangeControlNumber: "000000001",
    groupControlNumber: "1", transactionSetControlNumber: "0001",
  },
  header: {
    transactionSetPurposeCode: "00", referenceId: "FILE-202606", date: "20260601",
    sponsor: { entityIdentifierCode: "P5", name: "EMPLOYER CO" },
    payer: { entityIdentifierCode: "IN", name: "MEDPAY INSURANCE" },
  },
  members: [
    {
      subscriberIndicator: "Y", relationshipCode: "18", maintenanceTypeCode: "021",
      member: { lastName: "DOE", firstName: "JANE", idQualifier: "34", idCode: "MBR0001" },
      healthCoverages: [{ maintenanceTypeCode: "021", insuranceLineCode: "HLT" }],
    },
  ],
};
const ix = build834(spec);

Properties​

envelope​

readonly envelope: Build834EnvelopeSpec

Interchange / group / transaction identity.

readonly header: Build834HeaderSpec

BGN header + sponsor / payer parties.

members​

readonly members: readonly Build834MemberSpec[]

Loop 2000 member-level detail (≥ 1 required).