web-vitals package

name NPM package
type link
action https://www.npmjs.com/package/web-vitals

The library supports all of the Core Web Vitals as well as a number of other metrics that are useful in diagnosing real-user performance issues.

• Core Web Vitals
• Cumulative Layout Shift (CLS)
• First Input Delay (FID)
• Largest Contentful Paint (LCP)
• Other metrics
• Interaction to next Paint (INP) (experimental)
• First Contentful Paint (FCP)
• Time to First Byte (TTFB)