swiper/src/components/core/breakpoints/getBreakpoint.js

Most modern mobile touch slider and framework with hardware accelerated transitions

import { window } from 'ssr-window';

export default function (breakpoints) {
  const swiper = this;
  // Get breakpoint for window width
  if (!breakpoints) return undefined;
  let breakpoint = false;
  const points = [];
  Object.keys(breakpoints).forEach((point) => {
    points.push(point);
  });
  points.sort((a, b) => parseInt(a, 10) - parseInt(b, 10));
  for (let i = 0; i < points.length; i += 1) {
    const point = points[i];
    if (swiper.params.breakpointsInverse) {
      if (point <= window.innerWidth) {
        breakpoint = point;
      }
    } else if (point >= window.innerWidth && !breakpoint) {
      breakpoint = point;
    }
  }
  return breakpoint || 'max';
}