feat(primitives): implement time type

packages/primitives/src/index.ts

@@ -10,6 +10,7 @@ import { DecimalType, decimal } from "./decimal";
 import { InstantType, instant } from "./instant";
 import { IntegerType, integer } from "./integer";
 import { StringType, string } from "./string";
+import { TimeType, time } from "./time";
 import { URIType, uri } from "./uri";
 import { URLType, url } from "./url";
 
@@ -30,6 +31,8 @@ export {
   IntegerType,
   string,
   StringType,
+  time,
+  TimeType,
   uri,
   URIType,
   url,

packages/primitives/src/time.ts

@@ -0,0 +1,21 @@
+/**
+ * Time FHIR Primitive Runtime Type
+ */
+
+import { Type, success, failure, identity } from "io-ts";
+
+const TIME_REGEX = /([01][0-9]|2[0-3]):[0-5][0-9]:([0-5][0-9]|60)(\.[0-9]+)?/;
+
+export class TimeType extends Type<string> {
+  readonly _tag: "TimeType" = "TimeType";
+  constructor() {
+    super(
+      "time",
+      (m): m is string => typeof m === "string" && TIME_REGEX.test(m),
+      (m, c) => (this.is(m) ? success(m) : failure(m, c)),
+      identity
+    );
+  }
+}
+
+export const time = new TimeType();

packages/primitives/test/time.test.ts

@@ -0,0 +1,38 @@
+/**
+ * Tests for Time Runtime Type
+ */
+
+import { time } from "../src";
+import { assertSuccess, assertFailure, assertStrictEqual } from "./helpers";
+
+describe("TimeType", () => {
+  it("should succeed validating a valid value", () => {
+    const T = time;
+    assertSuccess(T.decode("11:48:22"));
+  });
+
+  it("should return the same reference if validation succeeded and nothing changed", () => {
+    const T = time;
+    const value = "11:48:22";
+    assertStrictEqual(T.decode(value), value);
+  });
+
+  it("should fail validating an invalid value", () => {
+    const T = time;
+    assertFailure(T.decode(2), ["Invalid value 2 supplied to : time"]);
+  });
+
+  it("should fail validating non hh:mm:ss formatted time", () => {
+    const T = time;
+    assertFailure(T.decode("24:00"), [
+      'Invalid value "24:00" supplied to : time'
+    ]);
+  });
+
+  it("should type guard", () => {
+    const T = time;
+    expect(T.is("11:48:22")).toEqual(true);
+    expect(T.is(true)).toEqual(false);
+    expect(T.is(undefined)).toEqual(false);
+  });
+});