[SalesForce] LWC Trailhead importing contact fields

I'm working up to the LWC super badge and I'm on the prerequisite trail:
Use Lightning Data Service to Work with Data

I'm seeing the following error:

We can’t find the 'FirstName', 'LastName', and 'Email' fields imported into contactCreator.js.

I've structured my imports like this, for example:

import FIRSTNAME_FIELD from "@salesforce/schema/Contact.FirstName";

I've tried renaming the imports to 'FirstName', 'LastName', and 'Email' and placing the imports in a different order. What am I missing?

Best Answer

Use single-quotes (which is a Prettier setting).