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175a2c58c1
Before this change, the following error would be thrown when compiling
with TypeScript:
```
node_modules/engine.io-client/build/esm/transports/websocket.node.d.ts:12:101 - error TS1340: Module 'ws' does not refer to a type, but is used as a type here. Did you mean 'typeof import('ws')'?
12 createSocket(uri: string, protocols: string | string[] | undefined, opts: Record<string, any>): import("ws");
~~~~~~~~~~~~
```
This behavior was introduced in [1], included in version `6.6.0`.
The return type is forced as `any`, so that the `@types/ws` dependency
is optional.
[1]: f4d898ee96
Related: https://github.com/socketio/socket.io/issues/5202