Image Conversion

index.js

const fs = require("fs");
const sharp = require("sharp");

const arguments = process.argv.slice(2);
const directory = arguments[0];

// This function is probably the useful part
async function convertToFormats(input, output) {
  await sharp(input)
    .avif({ quality: 80, speed: 3 })
    .toFile(`${output}.avif`)
    .then(() => console.log(`${output}.avif ... done`));

  await sharp(input)
    .webp({ quality: 80, lossless: true })
    .toFile(`${output}.webp`)
    .then(() => console.log(`${output}.webp ... done`));

  await sharp(input)
    .png()
    .toFile(`${output}.png`)
    .then(() => console.log(`${output}.png ... done`));
}

// Reading some nested directories looking for images (not validating)
// and using the sub-directory name to determine the file name.
// This part is super-specific and probably not useful to keep...
fs.readdirSync(directory).map((file) => {
  const subdir = `${directory}/${file}`;
  const isSubDirectory = fs.lstatSync(subdir).isDirectory();

  if (isSubDirectory && file !== "output") {
    fs.readdirSync(subdir).forEach((innerFile) => {
      const thisFile = `${subdir}/${innerFile}`;
      const newFilename = `tc-${file}-${innerFile.match(/\d+/)[0]}w`;
      const newFileLocation = `${directory}/output/${newFilename}`;

      convertToFormats(thisFile, newFileLocation);
    });
  }
}, []);