settings.js
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settings.js
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	/**
	* Creates an instance of the settings change listener.
	*
	* @param {Object} boundActions
	* @param {Object} render function that renders a jQuery el with the settings
	* @return {ext.popups.ChangeListener}
	*/
	export default function settings( boundActions, render ) {
	let settingsObj;

	return ( oldState, newState ) => {
	if ( !oldState ) {
	// Nothing to do on initialization
	return;
	}
	if (
	settingsObj &&
	Object.keys( oldState.settings.previewTypesEnabled ).length !==
	Object.keys( newState.settings.previewTypesEnabled ).length
	) {
	// the number of settings changed so force it to be repainted.
	settingsObj.refresh( newState.settings.previewTypesEnabled );
	}

	// Update global modal visibility
	if ( oldState.settings.shouldShow === false && newState.settings.shouldShow ) {
	// Lazily instantiate the settings UI
	if ( !settingsObj ) {
	settingsObj = render( boundActions, newState.settings.previewTypesEnabled );
	settingsObj.appendTo( document.body );
	}

	// Update the UI settings with the current settings
	settingsObj.setEnabled( newState.preview.enabled );
	settingsObj.show();
	} else if ( oldState.settings.shouldShow && newState.settings.shouldShow === false ) {
	settingsObj.hide();
	}

	// Update help visibility
	if ( oldState.settings.showHelp !== newState.settings.showHelp ) {
	settingsObj.toggleHelp( newState.settings.showHelp );
	}
	};
	}