static getBase64ForTag(
    uri: string,
    success: (base64ImageData: string) => void,
    failure: (error: any) => void
  ) {
    RCTImageStoreManager.getBase64ForTag(uri, success, failure);
  }
Retrieves the base64-encoded data for an image in the ImageStore. If the
specified URI does not match an image in the store, the failure callback
will be called.

Note that it is very inefficient to transfer large quantities of binary
data between JS and native code, so you should avoid calling this more
than necessary. To display an image in the ImageStore, you can just pass
the URI to an `<Image/>` component; there is no need to retrieve the
base64 data.