Use types based on the events listeners from http-proxy https://github.com/DefinitelyTyped/DefinitelyTyped/blob/51504fd999031b7f025220fab279f1b2155cbaff/types/http-proxy/index.d.ts
Use types based on the events listeners from http-proxy https://github.com/DefinitelyTyped/DefinitelyTyped/blob/51504fd999031b7f025220fab279f1b2155cbaff/types/http-proxy/index.d.ts