wp/app/plugins/debug-bar/panels/class-debug-bar-js.php

<?php

class Debug_Bar_JS extends Debug_Bar_Panel {
	var $real_error_handler = array();

	function init() {
		$this->title( __('JavaScript', 'debug-bar') );

		// attach here instead of debug_bar_enqueue_scripts
		// because we want to be as early as possible!
		$suffix = defined('SCRIPT_DEBUG') && SCRIPT_DEBUG ? '.dev' : '';
		wp_enqueue_script( 'debug-bar-js', plugins_url( "js/debug-bar-js$suffix.js", dirname(__FILE__) ), array(), '20111216' );
	}

	function render() {
		echo '<div id="debug-bar-js">';
		echo '<h2><span>' . __( 'Total Errors:', 'debug-bar' ) . "</span><div id='debug-bar-js-error-count'>0</div></h2>\n";
		echo '<ol class="debug-bar-js-list" id="debug-bar-js-errors"></ol>' . "\n";
		echo '</div>';
	}
}