Function toMiddleware

packages/express/src/middleware.ts:58–74

(
  firstHandler: ExpressRequestHandler,
  ...additionalHandlers: ExpressRequestHandler[]
)

 * middleware
 */
export function toMiddleware(
  firstHandler: ExpressRequestHandler,
  ...additionalHandlers: ExpressRequestHandler[]
): Middleware {
  if (additionalHandlers.length === 0) return toInterceptor(firstHandler);
  const handlers = [firstHandler, ...additionalHandlers];
  const middlewareList = handlers.map(handler =>
    toInterceptor<MiddlewareContext>(handler),
  );
  return (middlewareCtx, next) => {
    if (middlewareList.length === 1) {
      return middlewareList[0](middlewareCtx, next);
    }
    const middlewareChain = new MiddlewareChain(middlewareCtx, middlewareList);
    return middlewareChain.invokeInterceptors(next);
  };
}

/**
 * An adapter function to create a LoopBack middleware from Express middleware