RequireJsDefinitions.php

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<?php
namespace Magento\FunctionalTestingFramework\Extension\ReadinessMetrics;

use Facebook\WebDriver\Exception\UnexpectedAlertOpenException;

class RequireJsDefinitions extends AbstractMetricCheck
{
    protected function doesMetricPass($value)
    {
        return $value === null;
    }

    protected function fetchValueFromPage()
    {
        $script =
            'if (!window.requirejs) {
                return null;
            }
            var contexts = window.requirejs.s.contexts;
            for (var label in contexts) {
                if (contexts.hasOwnProperty(label)) {
                    var registry = contexts[label].registry;
                    for (var module in registry) {
                        if (registry.hasOwnProperty(module) && registry[module].enabled) {
                            return module;
                        }
                    }
                }
            }
            return null;';

        $moduleInProgress = $this->executeJS($script);
        if ($moduleInProgress === 'null') {
            $moduleInProgress = null;
        }
        return $moduleInProgress;
    }
}