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User-Defined Preferred Patterns and Preferences
Handlers deal with request and response logic only, pass everything to and from a business layer. Hex architecture
Wrap External APIs in Facades Wrap 3rd party libraries in Facades and use factory pattern when there could be multiple choices to use for a similar type of thing.
Mock the facade when unit testing a file that uses it. Unit test the facade itself with the real library do not mock it - but beware of non determinism that will need to be accounted for with some libraries such as date libraries. Use common sense with what should or should not be behind a facade. for facades around APIs - intercept requests and mock responses for unit tests.
use RTL for react testing
if building ui with Next JS, host in vercel and favor starting projects with https://vercel.com/templates/next.js/supabase
Tailwind and Shadcn are good choices for UI.
80% unit test coverage.