Added RECURRENCE-ID

src/pipeline/format.js

@@ -65,7 +65,8 @@ export function formatEvent(attributes = {}) {
     classification,
     created,
     lastModified,
-    htmlContent
+    htmlContent,
+    recurrenceId
   } = attributes
 
   let icsFormat = ''
@@ -111,6 +112,8 @@ export function formatEvent(attributes = {}) {
       icsFormat += setAlarm(alarm)
     })
   }
+  icsFormat += recurrenceId ? foldLine(`RECURRENCE-ID:${encodeNewLines(formatDate(recurrenceId))}`) + "\r\n" : "";
+
   icsFormat += `END:VEVENT\r\n`
 
   return icsFormat

src/schema/index.js

@@ -110,7 +110,8 @@ const eventShape = {
   created: dateTimeSchema({ required: false }),
   lastModified: dateTimeSchema({ required: false }),
   exclusionDates: yup.array().of(dateTimeSchema({ required: true })),
-  htmlContent: yup.string()
+  htmlContent: yup.string(),
+  recurrenceId : dateTimeSchema({ required: false })
 }
 
 const headerAndEventSchema = yup.object().shape({ ...headerShape, ...eventShape }).test('xor', `object should have end or duration (but not both)`, val => {

test/pipeline/format.spec.js

@@ -327,4 +327,16 @@ describe('pipeline.formatEvent', () => {
     })
     expect(formattedEvent).to.contain('EXDATE:20000620T010000Z,20000621T010000Z')
   })
+  it("writes recurrence ID", () => {
+    const event = {
+      uid:"uid",
+      title: "Test Event",
+      start: [2023, 5, 15, 10, 0],
+      end: [2023, 5, 15, 11, 0],
+      recurrenceId: [2023, 5, 15, 10, 0],
+    };
+
+    const result = formatEvent(event);
+    expect(result).to.contain("RECURRENCE-ID:20230515T100000Z");
+  });
 })