This is a custom script that is used to process events in order to clean and transform the utm_campaign property of the event.
The script exports a single function, processEvent(event, { config }), which takes in two arguments:
event: the event object that needs to be processed
config: an object containing any configuration options that may be required by the script
The processEvent() function first checks if the event object has a utm_campaign property, and if it does, it passes the value of this property to the cleanUtmCampain(utmCampaign) function.
The cleanUtmCampain(utmCampaign) function performs the following operations on the input utmCampaign:
- Replaces all occurrences of com- with comp-
- Replaces all occurrences of compp- with comp-
- Splits the input utmCampaign by the _ character, and keeps only the first part
- Splits the resulting string by the - character, and keeps only the first two parts
- Joins the resulting array of strings with a (space) character
The cleaned and transformed utm_campaign value is then assigned to the campaign property of the event object's $set property, and also assigned to the initial_campaign property of the event object's $set_once property.
Finally, the processed event object is returned by the processEvent() function, to be ingested by the system that called it.
The script is likely used to clean up and standardize the utm_campaign property of events before they are ingested into a data pipeline or analytics platform.