All files / util createMediaQueries.js

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import upperFirst from 'lodash/upperFirst';
import defaultBreakpoints from './breakpoints';
 
function createMediaQuery(min, max, key) {
  if ((min === null && max === null) || (min === 0 && max === null)) return null;
  let query = min ? `all and (min-width: ${min}px)` : 'all';
  if (max !== null) query = `${query} and (max-width: ${max}px)`;
  return { [key]: query };
}
 
export default (breakpoints = defaultBreakpoints) =>
  breakpoints.reduce((acc, breakpoint, index) => {
    const key = Object.keys(breakpoint).shift();
    const nextBreakPoint = breakpoints[index + 1];
    const upperKey = upperFirst(key);
    const min = breakpoint[key];
    const max = nextBreakPoint ? Object.values(nextBreakPoint).shift() - 1 : null;
    return {
      ...acc,
      ...createMediaQuery(min, max, key),
      ...createMediaQuery(null, max, `atLeast${upperKey}`),
      ...createMediaQuery(min, null, `atMost${upperKey}`),
    };
  }, {});