MediaWiki:Gadget-Tabs.js

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const Tabs = {

	init( $content ) {
		console.log( 'init' );
		$content.find( '.template-tabs-tab' ).on( 'click', Tabs.showTab );
	},

	showTab() {
		const $tab = $( this );
		const index = $tab.index();
		$tab.children( 'span' ).addClass( 'active' );
		$tab.siblings( '.template-tabs-tab' ).children( 'span' ).removeClass( 'active' );
		$tab.siblings( '.template-tabs-content' ).hide().eq( index ).show();
	}
};

mw.hook( 'wikipage.content' ).add( Tabs.init );