Requires the imagemagick CLI tool.

resize-photos.ts

import { readdir } from 'fs/promises';
import path from 'path';
import im from 'imagemagick';
import { promisify } from 'util';

const PHOTOS_PATH = path.join(process.cwd(), '/public/assets/photos/');
const MAX_WIDTH = 1920;

const identifyWidth = promisify(
  (filePath: string, callback: (err: any, result: string) => void) => {
    return im.identify(['-format', '%w', filePath], callback);
  }
);
const resize = promisify(im.resize);

(async () => {
  const fileNames = await readdir(PHOTOS_PATH);

  for (const fileName of fileNames) {
    const srcPath = path.join(PHOTOS_PATH, fileName);

    console.log(`[${fileName}] 🔎 Identifying...`);
    const width = parseInt(await identifyWidth(srcPath));
    if (typeof width == 'number' && width > MAX_WIDTH) {
      console.log(`[${fileName}] ◲ Resizing...`);
      await resize({
        srcPath,
        dstPath: srcPath,
        width: MAX_WIDTH,
        customArgs: ['-auto-orient'],
      });
      console.log(`[${fileName}] ✅ Resized!`);
    } else {
      console.log(`[${fileName}] ➡️ Skipping.`);
    }
  }
})();