google search index

packages/website/inject-seo.mjs

@@ -0,0 +1,69 @@
+import { mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const root = dirname(fileURLToPath(import.meta.url));
+const distHtml = join(root, 'dist', 'index.html');
+const { origin, routes } = JSON.parse(
+  readFileSync(join(root, 'src', 'seo.routes.json'), 'utf8'),
+);
+
+function apply(html, { title, description, url, robots }) {
+  let out = html;
+  out = out.replace(/<title>[\s\S]*?<\/title>/, `<title>${title}</title>`);
+  out = out.replace(
+    /(<meta\s+name="description"\s+content=")[^"]*(")/,
+    `$1${description}$2`,
+  );
+  out = out.replace(/(<meta\s+name="robots"\s+content=")[^"]*(")/, `$1${robots}$2`);
+  out = out.replace(/(<meta\s+property="og:title"\s+content=")[^"]*(")/, `$1${title}$2`);
+  out = out.replace(
+    /(<meta\s+property="og:description"\s+content=")[^"]*(")/,
+    `$1${description}$2`,
+  );
+  out = out.replace(/(<meta\s+property="og:url"\s+content=")[^"]*(")/, `$1${url}$2`);
+  out = out.replace(/(<meta\s+name="twitter:title"\s+content=")[^"]*(")/, `$1${title}$2`);
+  out = out.replace(
+    /(<meta\s+name="twitter:description"\s+content=")[^"]*(")/,
+    `$1${description}$2`,
+  );
+  out = out.replace(/(<link\s+rel="canonical"\s+href=")[^"]*(")/, `$1${url}$2`);
+  return out;
+}
+
+const template = readFileSync(distHtml, 'utf8');
+if (!template.includes('rel="canonical"') || !template.includes('og:title')) {
+  console.error('dist/index.html is missing SEO tags — check index.html');
+  process.exit(1);
+}
+
+const written = [];
+for (const route of routes) {
+  const url = route.path === '/' ? `${origin}/` : `${origin}${route.path}`;
+  const file = route.path === '/' ? 'index.html' : `${route.path.replace(/^\//, '')}/index.html`;
+  const dest = join(root, 'dist', file);
+  mkdirSync(dirname(dest), { recursive: true });
+  writeFileSync(
+    dest,
+    apply(template, {
+      title: route.title,
+      description: route.description,
+      url,
+      robots: 'index, follow',
+    }),
+  );
+  written.push(file);
+}
+
+writeFileSync(
+  join(root, 'dist', '404.html'),
+  apply(template, {
+    title: 'Page not found — LexAI',
+    description: 'That address is not a LexAI page.',
+    url: `${origin}/`,
+    robots: 'noindex, follow',
+  }),
+);
+written.push('404.html');
+
+console.log('SEO HTML written for', written.join(', '));