Buffer objects are used to represent a fixed-length sequence of bytes. Many Node.js APIs support Buffers.

The EventEmitter class is defined and exposed by the events module:

Constructs a 64 bit two's-complement integer, given its low and high 32 bit values as signed integers. See the from* functions below for more convenient ways of constructing Longs.

This class is an abstraction of a TCP socket or a streaming IPC endpoint (uses named pipes on Windows, and Unix domain sockets otherwise). It is also an EventEmitter.

https://nodejs.org/api/process.html#process_process_nexttick_callback_args

Creates and returns a Hash object that can be used to generate hash digests using the given algorithm. Optional options argument controls stream behavior.

Creates a new TCP or IPC server.