File to base64

getBase64.js

/**
 * getBase64
 * Source: https://ant.design/components/upload/#components-upload-demo-picture-card
 *
 * @param file
 * @returns {Promise<unknown>}
 */
const getBase64 = (file) =>
  new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => resolve(reader.result);
    reader.onerror = (error) => reject(error);
  });