initial commit

shared/impact.d.mts

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+import type { Impact, Incident, Localized, Service } from '../src/types';
+export function serviceImpact(service: Service, services?: Service[]): Impact | null;
+export function incidentImpact(incident: Incident, services: Service[]): Localized | null;

shared/impact.mjs

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+export function serviceImpact(service, services = []) {
+  if (!['down', 'degraded'].includes(service.status)) return null;
+  const scope = service.availabilityStatus === 'operational' && ['down', 'degraded'].includes(service.scenario?.status) ? 'scenario' : 'availability';
+  const message = service.impactPolicy?.[scope] || {
+    ru: 'Возможны ограничения в работе сервиса. Подробности уточняются.',
+    en: 'The service may have limitations. Details are being confirmed.',
+  };
+  const advice = service.impactPolicy?.advice || null;
+  const alternatives = (service.impactPolicy?.fallbacks || []).flatMap(id => {
+    const target = services.find(item => item.id === id);
+    return target?.status === 'operational' ? [{ id: target.id, name: target.name, url: target.publicUrl }] : [];
+  });
+  return { scope, message, advice, alternatives };
+}
+
+export function incidentImpact(incident, services) {
+  const service = services.find(item => item.id === incident.serviceId);
+  return service?.impactPolicy?.[incident.scope || 'availability'] || null;
+}