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- import ResizeObserver from 'resize-observer-polyfill';
- import { debounce } from 'throttle-debounce';
- const isServer = typeof window === 'undefined';
- /* istanbul ignore next */
- const resizeHandler = function(entries) {
- for (let entry of entries) {
- const listeners = entry.target.__resizeListeners__ || [];
- if (listeners.length) {
- listeners.forEach(fn => {
- fn();
- });
- }
- }
- };
- /* istanbul ignore next */
- export const addResizeListener = function(element, fn) {
- if (isServer) return;
- if (!element.__resizeListeners__) {
- element.__resizeListeners__ = [];
- element.__ro__ = new ResizeObserver(debounce(16, resizeHandler));
- element.__ro__.observe(element);
- }
- element.__resizeListeners__.push(fn);
- };
- /* istanbul ignore next */
- export const removeResizeListener = function(element, fn) {
- if (!element || !element.__resizeListeners__) return;
- element.__resizeListeners__.splice(element.__resizeListeners__.indexOf(fn), 1);
- if (!element.__resizeListeners__.length) {
- element.__ro__.disconnect();
- }
- };
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