fix global configs, fix one-time prop-fn's

Author: drcmda

packages/core/src/useSpring.js

@@ -1,12 +1,13 @@
 import { useSprings } from './useSprings'
-import { callProp } from 'shared'
+import { is } from 'shared'
 
 /** API
  * const [props, set, cancel] = useSpring(props, [optionalDeps])
  * const [props, set, cancel] = useSpring(() => props, [optionalDeps])
  */
 
 export const useSpring = (props, deps) => {
-  const [result, set, stop] = useSprings(1, [callProp(props)], deps)
+  const isFn = is.fun(props)
+  const [result, set, stop] = useSprings(1, isFn ? props : [props], deps)
   return [result[0], set, stop]
 }

packages/core/src/useTransition.js

@@ -26,7 +26,7 @@ const makeConfig = props => {
 
 export function useTransition(input, keyTransform, props) {
   // Coerce props to an object
-  props = callProp(props)
+  props = useMemo(() => callProp(props), [])
   props = makeConfig({
     ...props,
     items: input,