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Create ffi.rst
970504cPhil Freeman
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1+## Foreign Function Interface
2+
3+The `foreign import` keyword declares a value which is defined in Javascript, and its type:
4+
5+```haskell
6+foreign import pow :: (Number, Number) -> Number
7+```
8+
9+To declare a new type with no constructors, use `foreign import data` and provide the kind:
10+
11+```haskell
12+foreign import data IO :: * -> *
13+
14+foreign import console :: {
15+ log :: String -> IO {}
16+}
17+```