Why I cannot read anythings ?

[ying2025]

I write buf to the stream by "var writeSuc = Encoder.w.write(buf);", and read it by "var t = bufferRead.read();". But I got the null. I state as following.
function BufferStream() {
BufferStream.prototype.myWritableStreamBuffer = new streamBuffers.WritableStreamBuffer({
initialSize: (100 * 1024), // start at 100 kilobytes.
incrementAmount: (10 * 1024) // grow by 10 kilobytes each time buffer overflows.
});
BufferStream.prototype.myReadableStreamBuffer = new streamBuffers.ReadableStreamBuffer({
frequency: 10, // in milliseconds.
chunkSize: 2048 // in bytes.
});
}
let bufferStream = new BufferStream().myWritableStreamBuffer;
let bufferRead = new BufferStream().myReadableStreamBuffer;
var Encoder = {
BytesPacker: bytePack,
w: bufferStream,
maxDepth: 0,
depth: 0,
err: "",
bytes: []
}
var Encoder = {
BytesPacker: bytePack,
w: bufferStream,
maxDepth: 0,
depth: 0,
err: "",
bytes: []
}
buf = Buffer.from([ 164, 64 ]);
var writeSuc = Encoder.w.write(buf);
var t = bufferRead.read();