@feathersjs/express/src/declarations.ts

import http from 'http'
import express, { Express } from 'express'
import {
  Application as FeathersApplication,
  Params as FeathersParams,
  HookContext,
  ServiceMethods,
  ServiceInterface,
  RouteLookup
} from '@feathersjs/feathers'

interface ExpressUseHandler<T, Services> {
  <L extends keyof Services & string>(
    path: L,
    ...middlewareOrService: (
      | Express
      | express.RequestHandler
      | express.RequestHandler[]
      | (keyof any extends keyof Services ? ServiceInterface : Services[L])
    )[]
  ): T
  (path: string | RegExp, ...expressHandlers: express.RequestHandler[]): T
  (...expressHandlers: express.RequestHandler[]): T
  (handler: Express | express.ErrorRequestHandler): T
}

export interface ExpressOverrides<Services> {
  listen(port: number, hostname: string, backlog: number, callback?: () => void): Promise<http.Server>
  listen(port: number, hostname: string, callback?: () => void): Promise<http.Server>
  listen(port: number | string | any, callback?: () => void): Promise<http.Server>
  listen(callback?: () => void): Promise<http.Server>
  use: ExpressUseHandler<this, Services>
  server?: http.Server
}

export type Application<Services = any, Settings = any> = Omit<Express, 'listen' | 'use' | 'get' | 'set'> &
  FeathersApplication<Services, Settings> &
  ExpressOverrides<Services>

declare module '@feathersjs/feathers/lib/declarations' {
  interface ServiceOptions {
    express?: {
      before?: express.RequestHandler[]
      after?: express.RequestHandler[]
      composed?: express.RequestHandler
    }
  }
}

declare module 'express-serve-static-core' {
  interface Request {
    feathers: Partial<FeathersParams> & { [key: string]: any }
    lookup?: RouteLookup
  }

  interface Response {
    data?: any
    hook?: HookContext
  }

  interface IRouterMatcher<T> {
    // eslint-disable-next-line
    <P extends Params = ParamsDictionary, ResBody = any, ReqBody = any>(
      path: PathParams,
      ...handlers: (RequestHandler<P, ResBody, ReqBody> | Partial<ServiceMethods> | Application)[]
    ): T
  }
}