Cosyte 0.1: fourteen open-source TypeScript libraries for healthcare data

[NSchatz]

We have released 0.1 of fourteen open-source TypeScript libraries for healthcare data. They are on
npm under the @cosyte scope and MIT licensed. 0.1 is the first release line whose public API we treat
as settled: below 1.0, a breaking change ships in a new minor version, never in a patch, and the
changelog says what broke.

npm install @cosyte/hl7

Each library installs on its own: swap hl7 for any name below. All fourteen need Node.js 22 or newer
(@cosyte/cli accepts 22 through 25).

Package	What it does
@cosyte/hl7	Parse, build and serialize HL7 v2 messages, and read fields by name (msg.patient?.mrn) instead of by position
@cosyte/mllp	Send and receive HL7 v2 over MLLP: client and server, framing, ACK correlation, reconnects, TLS, and an in-memory transport for tests
@cosyte/fhir	Read, write and validate FHIR R4 in JSON and XML, keeping each value exactly as written
@cosyte/ccda	Parse, build and serialize C-CDA documents, with typed problems, medications, allergies and results
@cosyte/x12	Parse X12 005010 healthcare transactions (837, 835, 270/271, 834, 999 and more) into typed models, with every amount an exact decimal
@cosyte/ncpdp	Parse and build NCPDP SCRIPT ePrescriptions and Telecom pharmacy claims
@cosyte/astm	Parse and build ASTM E1394 lab-instrument records and E1381 checksummed frames
@cosyte/dicom	Read, write and de-identify DICOM Part 10 metadata (PS3.15 Basic Profile), without decoding pixels
@cosyte/terminology	Run FHIR $lookup, $validate-code, $translate and $expand over code systems, value sets and maps you supply
@cosyte/transform	Turn parsed HL7 v2 messages into FHIR R4 Bundles, with mappings taken from the HL7 Version 2 to FHIR implementation guide
@cosyte/deid	Apply a de-identification policy (HIPAA Safe Harbor by default) to HL7 v2, C-CDA, FHIR R4, X12, NCPDP Telecom and DICOM metadata, with a manifest that repeats no value
@cosyte/synth	Generate seeded, reproducible synthetic test data in HL7 v2, FHIR R4, C-CDA, X12, NCPDP and ASTM
@cosyte/dates	Validate and convert healthcare dates without adding precision or guessing a timezone
@cosyte/cli	The cosyte command: parse, validate, convert and redact healthcare data from the terminal, with an MCP server for agents

Where to go next

• Docs and quickstarts, one quickstart per library.
• The 0.1 launch post on our site.
• Examples: runnable end-to-end starters. Every message, document
  and image in them is synthetic.
• What changed in each library is on its v0.1.0 release page, for example
  @cosyte/hl7 v0.1.0.

Using this space

Ask questions in Q&A, suggest features in Ideas, and show what you build in Show and tell. Report bugs
in the library's own issue tracker. Please never post real patient data: use synthetic messages, such
as the ones @cosyte/synth generates.

Need it integrated? Talk to us.