SEO Tweaks

2026-05-12 00:45:02 +12:00
parent 955a563d14
commit ac6179e776
96 changed files with 1623 additions and 273 deletions
@@ -0,0 +1,72 @@
+import sharp from 'sharp';
+import { readdir, stat, rename } from 'node:fs/promises';
+import { join, extname, basename } from 'node:path';
+
+const MAX_WIDTH = 1600;
+const MIN_BYTES_TO_OPTIMISE = 250 * 1024;
+
+const dirs = ['src/lib/images', 'static/images'];
+
+async function optimiseFile(file) {
+  const ext = extname(file).toLowerCase();
+  const input = await sharp(file, { failOn: 'none' }).rotate();
+  const meta = await input.metadata();
+  const width = meta.width ?? 0;
+  const targetWidth = width > MAX_WIDTH ? MAX_WIDTH : width;
+  const pipeline = sharp(file, { failOn: 'none' })
+    .rotate()
+    .resize({ width: targetWidth, withoutEnlargement: true });
+
+  let buf;
+  if (ext === '.png') {
+    if (meta.hasAlpha) {
+      buf = await pipeline
+        .png({ palette: true, quality: 88, compressionLevel: 9, effort: 10 })
+        .toBuffer();
+    } else {
+      buf = await pipeline
+        .png({ palette: true, quality: 82, compressionLevel: 9, effort: 10 })
+        .toBuffer();
+    }
+  } else if (ext === '.jpg' || ext === '.jpeg') {
+    buf = await pipeline.jpeg({ quality: 82, mozjpeg: true }).toBuffer();
+  } else if (ext === '.webp') {
+    buf = await pipeline.webp({ quality: 80, effort: 6 }).toBuffer();
+  } else {
+    return null;
+  }
+
+  const original = (await stat(file)).size;
+  if (buf.length >= original) return { file, original, optimised: original, skipped: true };
+
+  const tmp = file + '.opt.tmp';
+  await sharp(buf).toFile(tmp);
+  await rename(tmp, file);
+  return { file, original, optimised: buf.length, skipped: false };
+}
+
+let totalOrig = 0;
+let totalNew = 0;
+for (const dir of dirs) {
+  const entries = await readdir(dir);
+  for (const name of entries) {
+    if (!/\.(png|jpe?g|webp)$/i.test(name)) continue;
+    const file = join(dir, name);
+    const s = await stat(file);
+    if (s.size < MIN_BYTES_TO_OPTIMISE) continue;
+    try {
+      const res = await optimiseFile(file);
+      if (!res) continue;
+      totalOrig += res.original;
+      totalNew += res.optimised;
+      const pct = ((1 - res.optimised / res.original) * 100).toFixed(0);
+      const flag = res.skipped ? ' (skipped: no gain)' : '';
+      console.log(
+        `${basename(file).padEnd(58)} ${(res.original / 1024).toFixed(0).padStart(5)}KB → ${(res.optimised / 1024).toFixed(0).padStart(5)}KB  (-${pct}%)${flag}`
+      );
+    } catch (err) {
+      console.error('FAILED', file, err.message);
+    }
+  }
+}
+console.log(`\nTotal: ${(totalOrig / 1024 / 1024).toFixed(2)} MB → ${(totalNew / 1024 / 1024).toFixed(2)} MB`);