From 086adfd443b2c337278b440a89e3874e5f70c042 Mon Sep 17 00:00:00 2001
From: Stephen Young <me@hownowstephen.com>
Date: Wed, 27 Apr 2022 03:30:40 -0400
Subject: [PATCH] feat: add support for invite-type anonymous event tracking
 (#106)

---
 lib/track.ts  | 12 +++++++-----
 test/track.ts | 13 ++++++++++++-
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/lib/track.ts b/lib/track.ts
index c0307c9..bc462a2 100644
--- a/lib/track.ts
+++ b/lib/track.ts
@@ -72,15 +72,17 @@ export class TrackClient {
   }
 
   trackAnonymous(anonymousId: string | number, data: RequestData = {}) {
-    if (isEmpty(anonymousId)) {
-      throw new MissingParamError('anonymousId');
-    }
-
     if (isEmpty(data.name)) {
       throw new MissingParamError('data.name');
     }
 
-    return this.request.post(`${this.trackRoot}/events`, { ...data, anonymous_id: anonymousId });
+    let payload = { ...data};
+
+    if (!isEmpty(anonymousId)) {
+      payload["anonymous_id"] = anonymousId;
+    }
+
+    return this.request.post(`${this.trackRoot}/events`, payload);
   }
 
   trackPageView(customerId: string | number, path: string) {
diff --git a/test/track.ts b/test/track.ts
index 1b38af7..388cccc 100644
--- a/test/track.ts
+++ b/test/track.ts
@@ -119,7 +119,7 @@ ID_INPUTS.forEach(([input, expected]) => {
 
 test('#trackAnonymous works', (t) => {
   sinon.stub(t.context.client.request, 'post');
-  t.throws(() => t.context.client.trackAnonymous(''), { message: 'anonymousId is required' });
+  t.throws(() => t.context.client.trackAnonymous(''), { message: 'data.name is required' });
   t.throws(() => t.context.client.trackAnonymous('123'), { message: 'data.name is required' });
   t.throws(() => t.context.client.trackAnonymous('123', { data: {} }), { message: 'data.name is required' });
   t.context.client.trackAnonymous('123', { name: 'purchase', data: 'yep' });
@@ -132,6 +132,17 @@ test('#trackAnonymous works', (t) => {
   );
 });
 
+test('#trackAnonymous ignores blank anonymousId', (t) => {
+  sinon.stub(t.context.client.request, 'post');
+  t.context.client.trackAnonymous('', { name: 'purchase', data: 'yep' })
+  t.truthy(
+    (t.context.client.request.post as SinonStub).calledWith(`${RegionUS.trackUrl}/events`, {
+      name: 'purchase',
+      data: 'yep',
+    }),
+    );
+  });
+  
 test('#trackPush works', (t) => {
   sinon.stub(t.context.client.request, 'post');
   t.context.client.trackPush();