Where are the `window.ethereum` docs?

Question

I'm calling window.ethereum and there are all these functions but it's confusing what they accept and the types. My understanding is that MetaMask injects something into window.ethereum... so I assume all the methods are from MetaMask? If so, are all the methods different for Coinbase wallet then?

1. Where are the docs for window.ethereum?
2. Are there any types associated with this?

My console when I console.log(window.ethereum);

coinbase - window.ethereum 
w {_events: {…}, _eventsCount: 4, _maxListeners: undefined, _filterPolyfill: e.FilterPolyfill, _subscriptionManager: e.SubscriptionManager, …}
close: ƒ ()
enable: ƒ ()
genericRequest: ƒ ()
getChainId: ƒ ()
hasMadeFirstChainChangedEmission: false
isCoinbaseWallet: true
request: ƒ ()
scanQRCode: ƒ ()
send: ƒ ()
sendAsync: ƒ ()
setAppInfo: ƒ ()
setProviderInfo: ƒ ()
updateProviderInfo: ƒ ()
_addresses: ['0xmyAddress']
_eventListener: undefined
_events: {chainChanged: Array(2), accountsChanged: Array(2), connect: ƒ, message: ƒ}
_eventsCount: 4
_filterPolyfill: e.FilterPolyfill {logFilters: Map(0), blockFilters: Set(0), pendingTransactionFilters: Set(0), cursors: Map(0), timeouts: Map(0), …}
_jsonRpcUrlFromOpts: "https://mainnet-infura.wallet.coinbase.com"
_maxListeners: undefined
_overrideIsMetaMask: false
_relay: S {appName: 'localhost:3000', appLogoUrl: 'http://localhost:3000/favicon.ico', subscriptions: t, accountsCallback: ƒ, chainCallback: ƒ, …}
_relayEventManager: e.WalletSDKRelayEventManager {_nextRequestId: 0, callbacks: Map(0)}
_relayProvider: async ƒ I()
_send: ƒ ()
_sendAsync: ƒ ()
_setAddresses: ƒ ()
_storage: e.ScopedLocalStorage {scope: '-walletlink:https://www.walletlink.org'}
_subscriptionManager: e.SubscriptionManager {events: o, subscriptionMiddleware: ƒ}
chainId: (...)
connected: (...)
host: (...)
isChainOverridden: (...)
isMetaMask: (...)
isWalletLink: (...)
jsonRpcUrl: (...)
networkVersion: (...)
selectedAddress: (...)
[[Prototype]]: o

For example:

1. I can't find setProviderInfo in the Ethereum docs
2. I can't find setProviderInfo in the Metamask docs either
3. Just to show I'm not lazy... Coinbase wallet docs are here

Answer 1

window.ethereum is described in EIP-1193.

EIP-1193 specification.