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rOACCT/node_modules/unload/src/browser.js
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browser.js
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			/* global WorkerGlobalScope */

			function add(fn) {
			if (typeof WorkerGlobalScope === 'function' && self instanceof WorkerGlobalScope) {
			// this is run inside of a webworker
			} else {

			/**
			* if we are on react-native, there is no window.addEventListener
			* @link https://github.com/pubkey/unload/issues/6
			*/
			if (typeof window.addEventListener !== 'function') return;

			/**
			* for normal browser-windows, we use the beforeunload-event
			*/
			window.addEventListener('beforeunload', () => {
			fn();
			}, true);

			/**
			* for iframes, we have to use the unload-event
			* @link https://stackoverflow.com/q/47533670/3443137
			*/
			window.addEventListener('unload', () => {
			fn();
			}, true);
			}

			/**
			* TODO add fallback for safari-mobile
			* @link https://stackoverflow.com/a/26193516/3443137
			*/
			}

			export default {
			add
			};