[ชื่อ module ที่เราสร้าง] [โฟลเดอร์ที่มีรูปที่ต้องการแปลง] [โฟลเดอร์ที่ต้องการให้รูปที่แปลงมาใส่] [type ที่เราจะแปลง]

เช่น

picTransform ./my-picture ./convert webp

mkdir picTransform && cd picTransform

npm init -y

mkdir ./bin

cd ./bin

#! /usr/bin/env node
console.log("Pic transform");

{
  "name": "pictransform",
  "version": "1.0.0",
  "description": "",
  "main": "./bin/index.js",
  "bin": {
    "picTransform": "./bin/index.js"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

npm install -g .

picTransform

npm install --save yargs

#! /usr/bin/env node
const yargs = require("yargs/yargs");
const { hideBin } = require("yargs/helpers");
const argv = yargs(hideBin(process.argv)).argv;
const [inputDir, outDir, imageType] = argv._;

console.log(`inputDir: ${inputDir}`);
console.log(`outDir: ${outDir}`);
console.log(`imageType: ${imageType}`);

picTransform ./my-picture ./convert webp

inputDir: ./my-picture
outDir: ./convert
imageType: webp

npm install --save sharp

#! /usr/bin/env node
const yargs = require("yargs/yargs");
const { hideBin } = require("yargs/helpers");
const { readFileFromDirectory, changeImageType } = require("./helper");
const argv = yargs(hideBin(process.argv)).argv;
const [inputDir, outDir, imageType] = argv._;

async function main() {
  try {
    const imagesName = await readFileFromDirectory({ inputDir });
    changeImageType({ inputDir, outDir, imagesName, imageType });
  } catch (error) {
    console.log(error.message);
  }
}

main();

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

function readFileFromDirectory({ inputDir }) {
  return new Promise((resolve, reject) => {
    fs.readdir(inputDir, async (err, imagesName) => {
      if (err) {
        return reject(err);
      }

      return resolve(imagesName);
    });
  });
}

function changeImageType({ inputDir, outDir, imagesName, imageType }) {
  let fileType;
  let sharpChangeType;

  if (imageType === "jpg" || imageType === "jpeg") {
    fileType = ".jpg";
    sharpChangeType = (input) => {
      return sharp(input).jpeg({
        quality: 100,
        chromaSubsampling: "4:4:4",
      });
    };
  } else if (imageType === "webp") {
    fileType = ".webp";
    sharpChangeType = (input) => {
      return sharp(input).webp({ lossless: true });
    };
  }

  return imagesName.map((imageName) => {
    fs.readFile(`${inputDir}/${imageName}`, async (err, input) => {
      if (err) {
        console.log(`changeImageType: ${err.message}`);
        return;
      }

      let imgName = imageName.split(".");
      imgName.pop();
      imgName = `${imgName.join(".")}${fileType}`;

      try {
        await sharpChangeType(input).toFile(`${outDir}/${imgName}`);
        console.log(`filename: ${imageName}, status: Done`);
      } catch (error) {
        console.log(`filename: ${imageName}, status: Error, ${error.message}`);
      }
    });
  });
}

module.exports = {
  readFileFromDirectory,
  changeImageType,
};

picTransform ./my-picture ./convert webp