Get base64 from File | convert file to base64

base64.ts

export const getBase64 = (file: File): Promise<string> =>
  new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = function (): void {
      resolve(reader.result?.toString());
    };
    reader.onerror = function (error): void {
      reject(error);
    };
  });