promisedView.js
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promisedView.js
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	const
	icons = require( './icons' ),
	View = require( './View' );

	/**
	* Internal for use inside Echo, GrowthExperiments only.
	* It's a view that spins until the promise resolves!
	* If the promise successfully resolves, the newView will be shown. if the
	* promise rejects and rejects to a view, the errorView will be shown.
	*
	* @function promisedView
	* @memberof module:mobile.startup
	* @param {jQuery.Promise} promise
	* @return {module:mobile.startup/View}
	*/
	module.exports = function promisedView( promise ) {
	const view = new View( {
	className: 'promised-view'
	} );
	view.$el.append( icons.spinner().$el );
	promise.then( ( newView ) => {
	view.$el.replaceWith( newView.$el );
	// update the internal reference.
	view.$el = newView.$el;
	}, ( errorView ) => {
	if ( !errorView \|\| !errorView.$el ) {
	// return early to keep backwards compatibility with clients of
	// promisedView that do not reject to an error view
	return;
	}

	view.$el.replaceWith( errorView.$el );
	// update the internal reference.
	view.$el = errorView.$el;
	} );

	return view;
	};