Question 1

How do I mock states in Mount for testing?

Accepted Answer

Use start-with or start-with-states to swap real states with test values or functions, as shown in the Swapping Alternate Implementations section, allowing easy integration with in-memory databases or channels.

Question 2

Mount vs Component: which is better for my project?

Accepted Answer

Mount is ideal for REPL-driven development with simple, top-level states, while Component suits applications needing explicit dependency graphs and structured lifecycle management; choose based on your preference for flexibility vs. rigor.

Question 3

How to handle exceptions in Mount start/stop functions?

Accepted Answer

Wrap calls in try/catch or use mount-up wrappers for custom error handling, as mentioned in the Exception Handling section, though it requires additional setup.

Question 4

Can I use Mount in a production Clojure web app?

Accepted Answer

Yes, but ensure all defstate namespaces are required before mount/start when packaging, and consider runtime arguments for configuration, as covered in Web and Uberjar and Runtime Arguments docs.

Question 5

How to disable lazy start in Mount's cljc mode?

Accepted Answer

Add ^{:on-lazy-start :throw} metadata to defstate to fail on dereference if not started, preventing unintended lazy initialization, detailed in the cljc mode section.

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