Pillar 3. Frontend Core Web Vitals, SPA Resilience & UICopy Anchor Link

6 Domain Combo Suites (22+ Isolated Slices)
100/100 Lighthouse Performance, zero layout shift (CLS), main-thread non-blocking telemetry, and resilient client-side SPA error recovery.

📦 Package CatalogCopy Anchor Link

🔍 Key Architectural PatternsCopy Anchor Link

1. SPA Chunk-Load Error RecoveryCopy Anchor Link

When a new production build deploys, users on older tabs encounter broken chunk errors when navigating to lazy-loaded routes (Loading chunk 42 failed). installChunkErrorHandler catches these errors and performs a seamless background refresh:

import { installChunkErrorHandler } from '@kido/spa-version-guard';

installChunkErrorHandler({
  onReload: () => console.log('Reloading to load latest application assets...'),
});

2. Zero-TBT Deferred TelemetryCopy Anchor Link

Keep your main thread completely free during initial load. Analytics and monitoring scripts execute only after the user interacts or the browser becomes idle:

import { DeferredTelemetryLoader, createGA4Plugin } from '@kido/traffic-attribution/deferred-telemetry';

const loader = new DeferredTelemetryLoader({
  idleTimeoutMs: 3000,
  plugins: [createGA4Plugin({ measurementId: 'G-XXXXXXXX' })],
});
loader.arm();

3. Zero-CLS Font Fallback CSSCopy Anchor Link

Prevent layout shifts when web fonts load by applying exact metric matching to fallback system fonts:

import { generateFontFallbackCss, FONT_METRIC_PRESETS } from '@kido/spa-version-guard/pwa-swr/zero-cls-font';

const fallbackCss = generateFontFallbackCss({
  fontFamily: 'Inter',
  preset: FONT_METRIC_PRESETS.inter,
});