Networkish - Quai Network Docs

type Networkish: 
  | Network
  | number
  | bigint
  | string
  | {
  "chainId": number;
  "name": string;
};

A Networkish can be used to allude to a Network, by specifying:

A Network object
A well-known (or registered) network name
A well-known (or registered) chain ID
An object with sufficient details to describe a network

Source

providers/network.ts:21