mastodon/app/javascript/flavours/glitch/utils/scrollbar.js

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/** @type {number | null} */
let cachedScrollbarWidth = null;
/**
* @returns {number}
*/
const getActualScrollbarWidth = () => {
const outer = document.createElement('div');
outer.style.visibility = 'hidden';
outer.style.overflow = 'scroll';
document.body.appendChild(outer);
const inner = document.createElement('div');
outer.appendChild(inner);
const scrollbarWidth = outer.offsetWidth - inner.offsetWidth;
outer.parentNode.removeChild(outer);
return scrollbarWidth;
};
/**
* @returns {number}
*/
export const getScrollbarWidth = () => {
if (cachedScrollbarWidth !== null) {
return cachedScrollbarWidth;
}
const scrollbarWidth = getActualScrollbarWidth();
cachedScrollbarWidth = scrollbarWidth;
return scrollbarWidth;
};