ValueSet/$validate-code: HTTP 500 "this.seeSourceProvider is not a function" validating against ValueSet/@all with inferSystem

[jmandel]

Summary

Validating a system-less code against the special http://hl7.org/fhir/ValueSet/@all value set with inferSystem=true crashes with HTTP 500 (uncaught TypeError) instead of returning a result.

Repro (live)

curl -sS -X POST 'https://tx.fhir.org/r5/ValueSet/$validate-code' \
  -H 'Content-Type: application/fhir+json' -w '\nHTTP %{http_code}\n' -d '{
  "resourceType":"Parameters","parameter":[
    {"name":"valueSet","resource":{"resourceType":"ValueSet","url":"http://hl7.org/fhir/ValueSet/@all","status":"active"}},
    {"name":"code","valueCode":"10000-8"},
    {"name":"inferSystem","valueBoolean":true}]}'

Observed

HTTP 500
{"resourceType":"OperationOutcome","issue":[{"severity":"error","code":"exception","details":{"text":"this.seeSourceProvider is not a function"},"diagnostics":"this.seeSourceProvider is not a function"}]}

Likely cause

In the @all branch of ValueSetChecker.check() (tx/workers/validate.js ~:470) the code calls this.seeSourceProvider(...) / this.canonical, but those live on the worker, not on ValueSetChecker — so the branch throws on entry. (Reached only when system is absent and inferSystem is true; a code with a system returns the NO_INFER warning earlier and doesn't crash.)

Expected

HTTP 200 Parameters with a result (per the $validate-code op def), not an uncaught TypeError.

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Confirmed live against https://tx.fhir.org on 2026-06-06 (software FHIRsmith 0.9.6). Source line refs are from the published main branch.

[grahamegrieve]

fixed.