Will scan given directory and convert the image by extension.

convert-all-images-in-folder.js

#! /usr/bin/env node
const glob = require("glob");
const sharp = require("sharp");

glob("./data/**/*.+(jpeg|png)", (err, files) => {
  Promise.allSettled(
    files.map((file) => {
      const link = file.split("/");
      link.pop();
      const newFile = `${link.join("/")}/main.jpeg`;
      return sharp(file)
        .jpeg({
          quality: 100,
          chromaSubsampling: "4:4:4",
        })
        .toFile(newFile);
    })
  )
    .then(() => console.log("Written all file"))
    .catch(console.error);
});