What is the meaning of the second parameter in the constructor:
(from this example)
constructor(private url: string, private WebSocketCtor: { new(url:string): WebSocket } = WebSocket) {}
Especially the = WebSocket part at the end. Why do I need this? In the example above it is called like this:
bootstrap(AimApp, [
...,
provide(RxWebSocket, {useFactory: (url:string) => {
return new RxWebSocket(url, WebSocket);
}, deps: [SOCKET_URL]})
]);
Since I am not very familiar with Angular, how would you call it otherwise?
{ new(url:string): WebSocket } this defines a constructor signature, which is used to hold class constructors. = WebSocket provides a default value for the parameters, the WebSocket class.
The point of this is to allow the user to plug in a custom WebSocket class, which is compatible with the WebSocket class, but also provides a default implementation by providing a default value for the WebSocketCtor parameter