When you are declaring a new variable, you may optionally declare its type.| flow.org
The [options] section in a .flowconfig file can contain several key-value| flow.org
Warning: Do not mistake any with mixed. It's also not the same as empty.| flow.org
Objects can be used in many different ways in JavaScript.| flow.org
Sometimes it's useful to create a type which is one of a set of other| flow.org