What does single & and single | operators do in flow js?

There is a piece of code in one of the files in react-native repo here as shown below:

export type Operation =
  & {instanceID: DebugID}
  & (
    | {type: 'mount', payload: string}
    | {type: 'insert child', payload: {toIndex: number, content: string}}
    | {type: 'move child', payload: {fromIndex: number, toIndex: number}}
    | {type: 'replace children', payload: string}
    | {type: 'replace text', payload: string}
    | {type: 'replace with', payload: string}
    | {type: 'update styles', payload: mixed /* Style Object */}
    | {type: 'update attribute', payload: {[name: string]: string}}
    | {type: 'remove attribute', payload: string});

What are the single & and | operators supposed to do here?

I am getting an Unexpected token error in this file at the first | operator when I am running a jest test case on my react-native app. I am running node version 5.9.1. My other team mate who is running node version 8.x doesn't run into the unexpected token error. So, I am assuming these operators are introduced post node version 5.9.1. Is that correct?