lighthouserc.js

module.exports = {
  ci: {
    collect: {
      url: ['http://localhost:3000/'],
      startServerCommand: 'npm run start',
      numberOfRuns: 3,
    },
    assert: {
      assertions: {
        'categories:performance': ['error', { minScore: 0.95 }],
        'categories:accessibility': ['error', { minScore: 0.95 }],
        'categories:best-practices': ['error', { minScore: 0.95 }],
        'categories:seo': ['error', { minScore: 0.95 }],
        
        // Performance Budgets Enforcement
        'largest-contentful-paint': ['error', { maxNumericValue: 2000 }],
        'cumulative-layout-shift': ['error', { maxNumericValue: 0.05 }],
        // INP is experimental in Lighthouse CI depending on version, fallback to max-potential-fid or tbt if needed, but we assert what we can
        'interactive': ['error', { maxNumericValue: 3500 }],
        'total-byte-weight': ['error', { maxNumericValue: 1500000 }], // 1.5MB total page weight as a proxy
      },
    },
    upload: {
      target: 'temporary-public-storage',
    },
  },
};