Migrate a V2 function to the V3 runtime

Event and visitor functions that use the V3 runtime differ from V2 functions as follows:

• Input data is provided as parameters instead of named exports.
  • An event function has two parameters: event and helper.
  • A visitor function has three parameters: visitor, visit, and helper.
• The helper object is used to get an authentication token ID or retrieve global variables. auth.get() and store.get() have been replaced with helper.getAuth() and helper.getGlobalVariable().
• track() is used to send events to Tealium Collect.

Migrate function code

To migrate a V2 function to the V3 runtime, follow these steps:

1. Create a new function of the appropriate type (event or visitor).
   For more information, see Create a function.
2. Replace the default function code with an empty event or visitor function, as follows:
   
   activate(async ({ event, helper }) => {  
   
   });
   

   activate(async ({ visitor, visit, helper }) => {  
   
   });
   

3. Copy the code from your V2 function that is between the opening and closing curly braces, { }, for the function. The import statements and the function declaration are not needed.
4. Paste the code into the new function.
5. If your V2 function used other libraries, such as CrytpoES, import them as before. For more information on importing libraries, see APIs and libraries for functions. For example:
   import CryptoES from 'crypto-es';
6. If your V2 function used auth.get() or store.get() add helper to the function parameters. For example:
   activate(async ({ event, helper }) => {
7. Replace any instances of auth.get() with helper.getAuth().
8. Replace any instances of store.get() with helper.getGlobalVariable().
9. If your V2 function used tealium.sendCollectEvent(), replace these calls with track() calls, as follows:

   activate(({ event }) => {
       const newEvent = { data: event.data.udo };
       track(newEvent, {
           tealium_account: event.account,
           tealium_profile: event.profile,
           tealium_datasource: 'abc123'
       })
   })