Convert a Base64 url to image file in Angular

// Base64 url of image trimmed one without data:image/png;base64
string base64="/9j/4AAQSkZJRgABAQE...";
// Naming the image
const date = new Date().valueOf();
let text = '';
const possibleText = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
for (let i = 0; i < 5; i++) {
   text += possibleText.charAt(Math.floor(Math.random() *    possibleText.length));
}
// Replace extension according to your media type
const imageName = date + '.' + text + '.jpeg';
// call method that creates a blob from dataUri
const imageBlob = this.dataURItoBlob(base64);
const imageFile = new File([imageBlob], imageName, { type: 'image/jpeg' });

The dataURItoBlob method:

dataURItoBlob(dataURI) {
   const byteString = window.atob(dataURI);
   const arrayBuffer = new ArrayBuffer(byteString.length);
   const int8Array = new Uint8Array(arrayBuffer);
   for (let i = 0; i < byteString.length; i++) {
     int8Array[i] = byteString.charCodeAt(i);
   }
   const blob = new Blob([int8Array], { type: 'image/jpeg' });    
   return blob;
}