NodeJS:如何在base64图片中使用图片大小？

const base64Data = "base64图片数据";
const imageData = Buffer.from(base64Data, 'base64');

const imageSize = imageData.length;

const jpeg = require('jpeg-js');
const decodedImage = jpeg.decode(imageData);
const width = decodedImage.width;
const height = decodedImage.height;

const PNG = require('pngjs').PNG;
const decodedImage = PNG.sync.read(imageData);
const width = decodedImage.width;
const height = decodedImage.height;

const GifEncoder = require('gif-encoder-2');
const decoder = new GifEncoder();
decoder.read(imageData);
const width = decoder.width;
const height = decoder.height;