@medplum/core: isResourceType() is broken medplum #support

@medplum/core: isResourceType() is broken

Zira

11/13/2025, 5:13 PM

isResourceType(resourceType)

from the

core

package seems to be broken. Its documentation gives this as an example:

isResourceType('Patient')

. However, running that in my Foo Medical-based app returns undefined. Digging into it, it appears to depend on the

core/src/base-schema.json

file, which doesn't seem to include a "Patient" entry. Am I using this function wrong?

Ian Plunkett

11/18/2025, 6:32 PM

@Zira , you need to pass the json representation of a resource into that method.

Ian Plunkett

11/18/2025, 6:32 PM

instead of 'Patient' you would pass something like

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{
  "resourceType": "Patient",
  "name": [
    {
      "family": "Test",
      "given": [
        "Patient"
      ]
    }
  ],
  "id": "d462f407-48c4-4f33-876a-b549b683fc21",
  "meta": {
    "versionId": "e6456ff9-7808-4498-8b73-3dd44542f152",
    "lastUpdated": "2025-11-18T18:26:07.563Z",
    "author": {
      "reference": "Practitioner/0194702a-c167-740d-8e95-f7c9338de5c5",
      "display": "Ian Plunkett"
    },
    "project": "0194702a-c12f-77bb-9109-7510aff58757",
    "compartment": [
      {
        "reference": "Project/0194702a-c12f-77bb-9109-7510aff58757"
      },
      {
        "reference": "Patient/d462f407-48c4-4f33-876a-b549b683fc21"
      }
    ]
  }
}

Zira

11/18/2025, 9:13 PM

Hi Ian, thanks for your response. I don't think that's correct. I believe your example object would be used for the

isResource()

method which accepts an

unknown

value. The

isResourceType()

function I'm talking about is in

packages/core/src/typeschema/types.ts

. It accepts a string called "resourceType"

Ian Plunkett

11/19/2025, 12:07 AM

🤦‍♂️ sorry about that. I misread it initially. The

isResourceType

function requires the FHIR schema to be loaded first, but it's not automatically initialized when you import

@medplum/core.

Ian Plunkett

11/19/2025, 12:07 AM

To test it out, you could do something like this directly from node

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const medplumCore = require('@medplum/core');
const fhirDefinitions = require('@medplum/definitions');

// Load the FHIR structure definitions
const structureDefs = fhirDefinitions.readJson('fhir/r4/profiles-resources.json');

// Index the schema
medplumCore.indexStructureDefinitionBundle(structureDefs);

// Now you can use isResourceType
const { isResourceType } = medplumCore;
console.log(isResourceType('Patient')); // true
console.log(isResourceType('Invalid')); // false

Ian Plunkett

11/19/2025, 12:08 AM

This assumes you are running node from the base of the medplum directory and you have run build on the repo

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