JS image to/from data URI

imagesDataUri.ts

import fs from "fs";

export const imageToDataUri = (image: string | Buffer): string | undefined => {
  const extTypeMap = {
    'png': 'image/png',
    'jpg': 'image/jpeg',
    'jpeg': 'image/jpeg',
    'webp': 'image/webp'
  };

  let base64;

  if (typeof image === 'string') {
    try {
      base64 = fs.readFileSync(image, 'base64')
      return `data:${extTypeMap[image.split('.').pop()]};base64,${base64}`;
    }
    catch (e) {
      console.log(e);
      return undefined;
    }
  }
  else if (Buffer.isBuffer(image)) {
    base64 = image.toString('base64');
    return `data:image/jpeg;base64,${base64}`;
  }
}

export const imageFromDataUri = (dataUri: string, url?: string) => {
  const data = new Buffer(dataUri.substring((dataUri.indexOf('base64,') || 0) + 7), 'base64');

  if (!url)
    return data;

  try {
    fs.writeFileSync(url, data);
  }

  catch (e) {
    console.log(e);
    return false;
  }

  return true;
}