masto-fe-archos/app/javascript/mastodon/is_mobile.ts

import { supportsPassiveEvents } from "detect-passive-events";

import { forceSingleColumn, hasMultiColumnPath } from "./initial_state";

const LAYOUT_BREAKPOINT = 630;

export const isMobile = (width: number) => width <= LAYOUT_BREAKPOINT;

export const transientSingleColumn = !forceSingleColumn && !hasMultiColumnPath;

export type LayoutType = "mobile" | "single-column" | "multi-column";
export const layoutFromWindow = (): LayoutType => {
  if (isMobile(window.innerWidth)) {
    return "mobile";
  } else if (!forceSingleColumn && !transientSingleColumn) {
    return "multi-column";
  } else {
    return "single-column";
  }
};

const listenerOptions = supportsPassiveEvents ? { passive: true } : false;

let userTouching = false;

const touchListener = () => {
  userTouching = true;

  window.removeEventListener("touchstart", touchListener);
};

window.addEventListener("touchstart", touchListener, listenerOptions);

export const isUserTouching = () => userTouching;