How should I import WebSocketLink ?

[ArnaudBarre]

In beta, I was importing it from @apollo/link-ws": "^2.0.0-beta.3" and it was working find.

In 3.1.1, I got a typing issue, because ApolloLink from @apollo/link-ws -> apollo-link-ws does not match the one from @apollo/client.

I can get it work by importing from "@apollo/client/link/ws".

Is a re-export missing somewhere ?

[benjamn]

This should work (although it was improved in v3.1.0 by #6656):

import { WebSocketLink } from "@apollo/client/link/ws"

However, you will probably want to avoid using @apollo/link-ws or apollo-link-ws at the same time, since they may have their own implementations of WebSocketLink (depending on which versions of those packages you're using).

Happy to answer follow-up questions, of course.

[ArnaudBarre]

Is it to simplify work of tree shaking that we cannot do import { WebSocketLink } from "@apollo/client" ?

[benjamn]

It's also to avoid cluttering the available top-level imports, and to avoid importing the entire library when using CommonJS (which Node.js still does in most cases). Any use of @apollo/client without a bundler benefits from having narrowly-scoped entry points for optional parts of the library, because there's no opportunity for tree-shaking without a bundler like Rollup or Webpack.