caria-website/module/@popperjs/core@2.11.8/lib/utils/getMainAxisFromPlacement.js.flow

// @flow
import type { Placement } from '../enums';

export default function getMainAxisFromPlacement(
  placement: Placement
): 'x' | 'y' {
  return ['top', 'bottom'].indexOf(placement) >= 0 ? 'x' : 'y';
}