Skip empty UTM parameters (#10)

Empty UTM parameters are no longer captured

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.3] - 2023-08-25
+
+### Changed
+
+- Empty UTM parameters are no longer captured.
+
 ## [0.4.2] - 2023-08-25
 
 ### Fixed

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@jeroen.bakker/just-attribute",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "description": "Realtime privacy-conscious marketing attribution for the web",
   "author": "Jeroen Bakker",
   "license": "MIT",

src/InteractionLogger.ts

@@ -127,7 +127,7 @@ export default class InteractionLogger {
 
         url.searchParams.forEach((value, key) => {
             const mappedKey = InteractionLogger.queryMapping[key];
-            if (mappedKey) {
+            if (mappedKey && value.length) {
                 interaction[mappedKey] = value;
             } else {
                 // Empty parameters can be considered missing as they don't tell us anything

tests/InteractionLogger.test.ts

@@ -384,3 +384,11 @@ test('the last interaction storage key can be set', async () => {
 
     expect(storage.getItem('foo')).toBe('1');
 });
+
+test('empty UTM parameters are skipped', async () => {
+    const logger = new InteractionLogger();
+
+    const interaction = logger.determineInteraction(new URL('https://www.example.com?utm_source=foo&utm_medium=bar&utm_campaign='));
+
+    expect(interaction).toEqual({source: 'foo', medium: 'bar', timestamp: expect.any(Number)});
+});