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import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
const _excluded = ["initMapStateToProps", "initMapDispatchToProps", "initMergeProps"];
import verifySubselectors from './verifySubselectors';
export function pureFinalPropsSelectorFactory(mapStateToProps, mapDispatchToProps, mergeProps, dispatch, {
  areStatesEqual,
  areOwnPropsEqual,
  areStatePropsEqual
}) {
  let hasRunAtLeastOnce = false;
  let state;
  let ownProps;
  let stateProps;
  let dispatchProps;
  let mergedProps;

  function handleFirstCall(firstState, firstOwnProps) {
    state = firstState;
    ownProps = firstOwnProps;
    stateProps = mapStateToProps(state, ownProps);
    dispatchProps = mapDispatchToProps(dispatch, ownProps);
    mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
    hasRunAtLeastOnce = true;
    return mergedProps;
  }

  function handleNewPropsAndNewState() {
    stateProps = mapStateToProps(state, ownProps);
    if (mapDispatchToProps.dependsOnOwnProps) dispatchProps = mapDispatchToProps(dispatch, ownProps);
    mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
    return mergedProps;
  }

  function handleNewProps() {
    if (mapStateToProps.dependsOnOwnProps) stateProps = mapStateToProps(state, ownProps);
    if (mapDispatchToProps.dependsOnOwnProps) dispatchProps = mapDispatchToProps(dispatch, ownProps);
    mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
    return mergedProps;
  }

  function handleNewState() {
    const nextStateProps = mapStateToProps(state, ownProps);
    const statePropsChanged = !areStatePropsEqual(nextStateProps, stateProps);
    stateProps = nextStateProps;
    if (statePropsChanged) mergedProps = mergeProps(stateProps, dispatchProps, ownProps);
    return mergedProps;
  }

  function handleSubsequentCalls(nextState, nextOwnProps) {
    const propsChanged = !areOwnPropsEqual(nextOwnProps, ownProps);
    const stateChanged = !areStatesEqual(nextState, state, nextOwnProps, ownProps);
    state = nextState;
    ownProps = nextOwnProps;
    if (propsChanged && stateChanged) return handleNewPropsAndNewState();
    if (propsChanged) return handleNewProps();
    if (stateChanged) return handleNewState();
    return mergedProps;
  }

  return function pureFinalPropsSelector(nextState, nextOwnProps) {
    return hasRunAtLeastOnce ? handleSubsequentCalls(nextState, nextOwnProps) : handleFirstCall(nextState, nextOwnProps);
  };
}
// TODO: Add more comments
// The selector returned by selectorFactory will memoize its results,
// allowing connect's shouldComponentUpdate to return false if final
// props have not changed.
export default function finalPropsSelectorFactory(dispatch, _ref) {
  let {
    initMapStateToProps,
    initMapDispatchToProps,
    initMergeProps
  } = _ref,
      options = _objectWithoutPropertiesLoose(_ref, _excluded);

  const mapStateToProps = initMapStateToProps(dispatch, options);
  const mapDispatchToProps = initMapDispatchToProps(dispatch, options);
  const mergeProps = initMergeProps(dispatch, options);

  if (process.env.NODE_ENV !== 'production') {
    verifySubselectors(mapStateToProps, mapDispatchToProps, mergeProps);
  }

  return pureFinalPropsSelectorFactory(mapStateToProps, mapDispatchToProps, mergeProps, dispatch, options);
}

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