method BufWriterSync.prototype.writeSync
BufWriterSync.prototype.writeSync(data: Uint8Array): numberWrites the contents of data into the buffer. If the contents won't fully
fit into the buffer, those bytes that can are copied into the buffer, the
buffer is the flushed to the writer and the remaining bytes are copied into
the now empty buffer.
Parameters
data: Uint8ArrayReturn Type
the number of bytes written to the buffer.