Runtime Types for FHIR primitive types built on top of io-ts. io-ts introduces the concept of a runtime type which represents a runtime validator for a static TypeScript type. It can decode unknown typed input and validate against FHIR primitive type rules.
import { instant } from "@tangdrew/primitives";
// validation succeeded
instant.decode("2015-02-07T13:28:17.239+02:00"); // Right("2015-02-07T13:28:17.239+02:00")
// validation succeeded
instant.decode(12345); // Left([...])These primitive type combinators can be combined to form complex FHIR types.
import * as t from "io-ts";
import { uri, string, code, boolean } from "@tangdrew/primitives";
const Coding = t.partial({
system: uri,
version: string,
code: code,
display: string,
userSelected: boolean
});
// validation succeeded
Coding.decode(
JSON.parse(
'{"system":"http://loinc.org","version":"2.62","code":"55423-8","display":"Number of steps in unspecified time Pedometer"}'
)
); // => Right({{system:"http://loinc.org",version:"2.62",code:"55423-8",display:"Number of steps in unspecified time Pedometer"})
// validation failed
Coding.decode(JSON.parse('{"system":false}')); // => Left([...])