re-frame/docs/FAQs/Why-CLJC.md

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## Table Of Contents

- [Question](#question)
- [Answer](#answer)

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### Question

Why is re-frame implemented in `.cljc` files?   Aren't ClojureScript 
files meant to be `.cljs`?

### Answer 

So tests can be run on both the JVM and the JS platforms,
re-frame's implementation is mostly in `.cljc` files. 
 
The trailing `c` in `.cljc` stands for `common`.  

Necessary interop for each platform can be found in
`interop.clj`  (for the JVM)  and `interop.cljs` (for JS).

See also: https://github.com/Day8/re-frame-test


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