Definition
File API defines FileReaderSync
[Exposed=(DedicatedWorker,SharedWorker)]
interface FileReaderSync {
constructor();
// Synchronously return strings
ArrayBuffer readAsArrayBuffer(Blob blob);
DOMString readAsBinaryString(Blob blob);
DOMString readAsText(Blob blob, optional DOMString encoding);
DOMString readAsDataURL(Blob blob);
};