boring-maths/astro.config.mjs at master · kitfunso/boring-maths · GitHub

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// @ts-check
import { defineConfig } from 'astro/config';

import tailwindcss from '@tailwindcss/vite';
import preact from '@astrojs/preact';
import sitemap from '@astrojs/sitemap';

// https://astro.build/config
export default defineConfig({
  site: 'https://boring-math.com/',

  // Consistent trailing slash handling for better SEO
  trailingSlash: 'never',

  vite: {
    plugins: [tailwindcss()],
    build: {
      // Improve chunk splitting for better caching
      rollupOptions: {
        output: {
          manualChunks: {
            'preact-vendor': ['preact', 'preact/hooks', 'preact/compat'],
          },
        },
      },
    },
  },

  integrations: [
    preact({ compat: true }), // Enable React compatibility
    sitemap({
      filter(page) {
        return !page.includes('/embed/');
      },
      serialize(item) {
        // Set priority based on page depth
        if (item.url === 'https://boring-math.com/') {
          item.priority = 1.0;
          item.changefreq = 'weekly';
        } else if (item.url.match(/\/calculators\/(automotive|brewing|business|engineering|events|everyday|finance|health|hobbies|home|income|uk-tax|us-tax)$/)) {
          item.priority = 0.9;
          item.changefreq = 'weekly';
        } else if (item.url.includes('/calculators/')) {
          item.priority = 0.8;
          item.changefreq = 'monthly';
        } else {
          item.priority = 0.5;
          item.changefreq = 'monthly';
        }
        return item;
      },
    }),
  ],

  // Note: /privacy is redirected to /privacy-policy at the edge via
  // public/_redirects (Cloudflare). Astro-level redirects emit a static
  // HTML stub with <meta robots noindex>, which GSC flagged as
  // "Excluded by 'noindex' tag" on a sitemap-discovered URL.

  build: {
    // Cloudflare Pages needs directory-style output for nested extensionless
    // routes like /calculators/401k-calculator to resolve reliably.
    format: 'directory',
  },

  output: 'static',

  // Prefetch links for faster navigation
  prefetch: {
    prefetchAll: true,
    defaultStrategy: 'hover',
  },
});