Interface UnderlyingByteSource

interface UnderlyingByteSource {
    autoAllocateChunkSize?: number;
    cancel?: UnderlyingSourceCancelCallback;
    pull?: (
        controller: ReadableByteStreamController,
    ) => void | PromiseLike<void>;
    start?: (controller: ReadableByteStreamController) => any;
    type: "bytes";
}