@apollo/client 4.0.0-alpha.12 on Node.js Yarn

#12586 605db8e Thanks @jerelmiller! - Remove the typeDefs option from ApolloClient.
#12588 eed825a Thanks @jerelmiller! - Remove TContext generic argument from all types that use it. TContext is replaced with DefaultContext which can be modified using declaration merging.
#12590 a005e82 Thanks @jerelmiller! - Drop graphql v15 as a valid peer dependency.
#12591 a7e7383 Thanks @jerelmiller! - Rename the @apollo/client/link/core entrypoint to @apollo/client/link.
#12589 15f5a1c Thanks @jerelmiller! - Require the link option when instantiating ApolloClient. This removes the uri, credentials and headers options from ApolloClient in favor of passing an instantiated HttpLink directly. To migrate:
If using uri, credentials, or headers options
```
new ApolloClient({
  // ...
- uri,
- credentials,
- headers,
+ link: new HttpLink({ uri, credentials, headers }),
// or if you prefer the function call approach:
+ link: createHttpLink({ uri, credentials, headers }),
});
```
If creating a client without the link option
```
new ApolloClient({
  // ...
+ link: ApolloLink.empty()
});
```

@apollo/client 4.0.0-alpha.12 v4.0.0-alpha.12 on Node.js Yarn