showOnPageReload.js
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showOnPageReload.js
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	const
	storageKey = 'mobileFrontend/toast';

	/**
	* Show the previously saved toast data and delete it from storage
	*
	* @memberof Toast
	* @instance
	* @private
	*/
	function showPending() {
	let data = mw.storage.get( storageKey );
	if ( data ) {
	data = JSON.parse( data );
	mw.notify( data.content, data.options );
	mw.storage.remove( storageKey );
	}
	}

	mw.requestIdleCallback( showPending );

	/**
	* Save the toast data in storage so that we can show it on page reload.
	* Also check whether there is a pending message that's not shown yet.
	* If yes, output a warning message and discard this message.
	* This is to ensure that the page needs to be reloaded before adding
	* a new message for showing later.
	*
	* @memberof Toast
	* @instance
	* @param {string} content Content to be placed in element
	* @param {Object\|string} [options]
	* If a string (deprecated) CSS class to add to the element
	* If an object, more options for the notification see mw.notification.show.
	* For backwards compatibility reasons if a string is given it will be
	* treated as options.type
	*/
	function showOnPageReload( content, options ) {
	if ( mw.storage.get( storageKey ) ) {
	mw.log.warn(
	'A pending toast message already exits. ' +
	'The page should have been reloaded by now.'
	);
	return;
	}
	mw.storage.set( storageKey, JSON.stringify( {
	content,
	options
	} ) );
	}

	module.exports = { showOnPageReload };