finlabsindia/wp-content/plugins/jetpack/modules/related-posts/related-posts-customizer.js

/**
 * Adds functionality for Related Posts controls in Customizer.
 */
(function( api ) {
	'use strict';

	api( 'jetpack_relatedposts[show_headline]', function( showHeadlineSetting ) {

		var setupHeadlineControl = function( headlineControl ) {
			var setActiveState, isDisplayed;

			isDisplayed = function() {
				return showHeadlineSetting.findControls()[0].active.get() && showHeadlineSetting.get();
			};

			setActiveState = function() {
				headlineControl.active.set( isDisplayed() );
			};

			headlineControl.active.validate = isDisplayed;

			setActiveState();

			showHeadlineSetting.bind( setActiveState );
		};

		api.control( 'jetpack_relatedposts[headline]', setupHeadlineControl );
	} );

})( wp.customize );