frontend/src/redux/app.js


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export const makeSelectLocationState = () => {
  let prevRoutingState;
  let prevRoutingStateJS;

  return (state) => {
    const routingState = state.get('routing')

    if (!routingState.equals(prevRoutingState)) {
      prevRoutingState = routingState
      prevRoutingStateJS = routingState.toJS()
    }

    return prevRoutingStateJS;
  }
}