swiper/svelte/get-changed-params.js

import { isObject } from './utils.js';
import { paramsList } from './params-list.js';

function getChangedParams(swiperParams, oldParams) {
  const keys = [];
  if (!oldParams) return keys;

  const addKey = key => {
    if (keys.indexOf(key) < 0) keys.push(key);
  };

  const watchParams = paramsList.filter(key => key[0] === '_').map(key => key.replace(/_/, ''));
  watchParams.forEach(key => {
    if (key in swiperParams && key in oldParams) {
      if (isObject(swiperParams[key]) && isObject(oldParams[key])) {
        const newKeys = Object.keys(swiperParams[key]);
        const oldKeys = Object.keys(oldParams[key]);

        if (newKeys.length !== oldKeys.length) {
          addKey(key);
        } else {
          newKeys.forEach(newKey => {
            if (swiperParams[key][newKey] !== oldParams[key][newKey]) {
              addKey(key);
            }
          });
          oldKeys.forEach(oldKey => {
            if (swiperParams[key][oldKey] !== oldParams[key][oldKey]) addKey(key);
          });
        }
      } else if (swiperParams[key] !== oldParams[key]) {
        addKey(key);
      }
    }
  });
  return keys;
}

export { getChangedParams };