Functions and Their Interaction with the Customiser

[b-wall]

Hi there,

I have a live delivery function, that takes in and processes delivery options based on the title. This throws an error and panics if all delivery titles are hidden, as it should always show one.

I started receiving errors from a live store using my function, and upon investigation I realised that the store owner navigated to the checkout in the customiser, which contains dummy delivery title data, and caused the function to throw an error.

This was not ideal as error checking on the function should only be reflective of the live checkout at the time.

I would expect that either:

a) The function does not throw errors as the dataset in the customiser is different
b) (Preferable option but more work) The checkout in the customiser reflects the live checkout, including any checkout data like shipping rates.

To replicate:

1. Set up a development store and create a function. In my case I made a delivery function.
2. Have the function throw an error if all delivery options are hidden (this implies that the function failed in my use case).
3. Run the function once with the live checkout, and note that when the delivery option handles match the live checkout handles there is no issue.
4. Run the function again on the customiser checkout, and note that the delivery option handle does not match, and therefore sends an error to the app panel.

Thank you!