export enum WebVitalsRating {
GOOD = 'good',
NEEDS_IMPROVEMENT = 'needs-improvement',
POOR = 'poor',
}
export const WEB_VITALS_THRESHOLDS = {
FCP: {
GOOD: 1800,
NEEDS_IMPROVEMENT: 3000,
},
LCP: {
GOOD: 2500,
NEEDS_IMPROVEMENT: 4000,
},
FID: {
GOOD: 100,
NEEDS_IMPROVEMENT: 300,
},
CLS: {
GOOD: 0.1,
NEEDS_IMPROVEMENT: 0.25,
},
TTFB: {
GOOD: 800,
NEEDS_IMPROVEMENT: 1800,
},
} as const;
export const PERFORMANCE_THRESHOLDS = {
TBT: {
GOOD: 200,
NEEDS_IMPROVEMENT: 600,
},
TTI: {
WARNING: 3800,
CRITICAL: 7300,
},
LONG_TASK_DURATION: 50,
} as const;
export const SCORING_THRESHOLDS = {
FCP: {
EXCELLENT: 1800,
GOOD: 3000,
FAIR: 3800,
},
LCP: {
EXCELLENT: 2500,
GOOD: 4000,
},
CLS: {
EXCELLENT: 0.1,
GOOD: 0.25,
},
TBT: {
EXCELLENT: 200,
GOOD: 600,
},
} as const;
export const WAIT_TIMES = {
METRICS_STABLE: 500,
METRICS_COLLECTION_SHORT: 1000,
METRICS_COLLECTION_LONG: 3000,
PAGE_LOAD_TIMEOUT: 30000,
FALLBACK_DELAY: 2000,
} as const;
export const LIMITATIONS = [
'Accessibility, best-practices, and SEO scores are approximate values, not complete audits',
'Metrics collection is based on Web Vitals and CDP APIs, which may differ from actual Lighthouse results',
'Some audit items may be missing or incomplete',
] as const;
