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import GHC.JS.Prim
foreign import javascript "((x) => { return undefined; })"
js_undefined :: JSVal
main :: IO ()
main = do
print (isUndefined js_undefined)
print (isUndefined $ toJSString "")
print (isUndefined $ toJSString "test")
print (isUndefined $ toJSInt 0)
print (isUndefined $ toJSInt 1)
print (isUndefined $ toJSInt 2)
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