Omicron - Middleware: req to Option

omicron-middleware-req-to-option.ts

import * as E from "fp-ts/lib/Either";
import * as O from "fp-ts/lib/Option";
import { RouteHandler, r, useMiddleware, Middleware, HttpRequest } from "@zaetrik/omicron";

const toOption: Middleware = (req: HttpRequest): E.Either<Error, O.Option<RequestBody>> => 
  E.tryCatch(() => 
  O.some(req.body), E.toError);

const routeHandler: RouteHandler = r
  ("/")
  ("GET")
  (useMiddleware
    ([toOption])
    ((req: O.Option<RequestBody>) => req))
  ((_, err) => err.message);