fix: fix attribution to capture UTMs even if there is no referral info

packages/plugin-web-attribution-browser/src/helpers.ts

@@ -17,6 +17,11 @@ const domainWithoutSubdomain = (domain: string) => {
   return parts.slice(parts.length - 2, parts.length).join('.');
 };
 
+//Direct traffic mean no external referral, no UTMs, no click-ids, and no other customer identified marketing campaign url params.
+const isDirectTraffic = (current: Campaign) => {
+  return Object.values(current).every((value) => !value);
+};
+
 export const isNewCampaign = (
   current: Campaign,
   previous: Campaign | undefined,
@@ -30,8 +35,8 @@ export const isNewCampaign = (
     return false;
   }
 
-  //In the same session, no referrer should not override or unset any persisting query params
-  if (!isNewSession && !referrer && previous) {
+  //In the same session, direct traffic should not override or unset any persisting query params
+  if (!isNewSession && isDirectTraffic(current) && previous) {
     return false;
   }
 

packages/plugin-web-attribution-browser/test/helpers.test.ts

@@ -113,7 +113,7 @@ describe('isNewCampaign', () => {
     ).toBe(false);
   });
 
-  test('should return false for no referrer in the same session', () => {
+  test('should return false for no extra referrer with direct traffic in the same session', () => {
     const previousCampaign = {
       ...BASE_CAMPAIGN,
       utm_campaign: 'utm_campaign',
@@ -125,6 +125,20 @@ describe('isNewCampaign', () => {
 
     expect(isNewCampaign(currentCampaign, previousCampaign, {}, false)).toBe(false);
   });
+
+  test('should return true for no referrer with any new campaign in the same session', () => {
+    const previousCampaign = {
+      ...BASE_CAMPAIGN,
+      utm_campaign: 'utm_campaign',
+      referring_domain: 'a.b.c.d',
+    };
+    const currentCampaign = {
+      ...BASE_CAMPAIGN,
+      utm_source: 'utm_source',
+    };
+
+    expect(isNewCampaign(currentCampaign, previousCampaign, {}, false)).toBe(true);
+  });
 });
 
 describe('isExcludedReferrer', () => {