MyMongodb/node_modules/popper.js/src/modifiers/computeStyle.js

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import getSupportedPropertyName from '../utils/getSupportedPropertyName';
import find from '../utils/find';
import getOffsetParent from '../utils/getOffsetParent';
import getBoundingClientRect from '../utils/getBoundingClientRect';
import getRoundedOffsets from '../utils/getRoundedOffsets';
import isBrowser from '../utils/isBrowser';

const isFirefox = isBrowser && /Firefox/i.test(navigator.userAgent);

/**
 * @function
 * @memberof Modifiers
 * @argument {Object} data - The data object generated by `update` method
 * @argument {Object} options - Modifiers configuration and options
 * @returns {Object} The data object, properly modified
 */
export default function computeStyle(data, options) {
  const { x, y } = options;
  const { popper } = data.offsets;

  // Remove this legacy support in Popper.js v2
  const legacyGpuAccelerationOption = find(
    data.instance.modifiers,
    modifier => modifier.name === 'applyStyle'
  ).gpuAcceleration;
  if (legacyGpuAccelerationOption !== undefined) {
    console.warn(
      'WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!'
    );
  }
  const gpuAcceleration =
    legacyGpuAccelerationOption !== undefined
      ? legacyGpuAccelerationOption
      : options.gpuAcceleration;

  const offsetParent = getOffsetParent(data.instance.popper);
  const offsetParentRect = getBoundingClientRect(offsetParent);

  // Styles
  const styles = {
    position: popper.position,
  };

  const offsets = getRoundedOffsets(
    data,
    window.devicePixelRatio < 2 || !isFirefox
  );

  const sideA = x === 'bottom' ? 'top' : 'bottom';
  const sideB = y === 'right' ? 'left' : 'right';

  // if gpuAcceleration is set to `true` and transform is supported,
  //  we use `translate3d` to apply the position to the popper we
  // automatically use the supported prefixed version if needed
  const prefixedProperty = getSupportedPropertyName('transform');

  // now, let's make a step back and look at this code closely (wtf?)
  // If the content of the popper grows once it's been positioned, it
  // may happen that the popper gets misplaced because of the new content
  // overflowing its reference element