Optionalparams: { internalBufferSize?: number }Read data from the underlying source into the provided Uint8Array, up to the length of the array, and return the number of bytes read.
If there are no bytes available currently, the implementation is supposed to wait until at least one byte is available, and only then resolve the promise. Resolving the promise with a zero-length Uint8Array is marking the end of the source.
Uint8Array containing the bytes that were read.
read a chunk of data, and whether it is the last one
a reader that reads one read ahead, allowing the caller to know whether the chunk being read is the last one