startConfig = function (nodeHandle, allTouchHandles, changedIndices) {
  return _touchConfig(
    'topTouchStart',
    nodeHandle,
    allTouchHandles,
    changedIndices,
    nodeHandle,
  );
}
Creates test data for touch events using environment agnostic "node
handles".

@param {NodeHandle} nodeHandle Environment agnostic handle to DOM node.
@param {Array<NodeHandle>} allTouchHandles Encoding of all "touches" in the
form of a mapping from integer (touch `identifier`) to touch target. This is
encoded in array form. Because of this, it is possible for two separate
touches (meaning two separate indices) to have the same touch target ID -
this corresponds to real world cases where two separate unique touches have
the same target. These touches don't just represent all active touches,
rather it also includes any touches that are not active, but are in the
process of being removed.
@param {Array<NodeHandle>} changedIndices Indices of `allTouchHandles` that
have changed.
@return {object} Config data used by test cases for extracting responder
events.