taskeither.ts

import axios, { AxiosResponse } from "axios";
import * as F from "fp-ts/function";
import * as E from "fp-ts/Either";
import * as T from "fp-ts/Task";
import * as TE from "fp-ts/TaskEither";

type ToDo = {
  userId: number;
  id: number;
  title: string;
  completed: boolean;
};

const safeGet = (url: string): TE.TaskEither<Error, AxiosResponse> =>
  TE.tryCatch(() => axios.get(url), E.toError);

const fetchTodo = (id: number): TE.TaskEither<string, ToDo> =>
  F.pipe(
    safeGet(`https://jsonplaceholder.typicode.com/todos/${id}`),
    TE.fold(
      (e: Error) => T.of(e.message),
      (a: AxiosResponse) => T.of(a.data)
    )
  );

const main = async () => {
  const resp = await fetchTodo(1)();
  // { userId: 1, id: 1, title: 'delectus aut autem', completed: false }
  console.log(resp);
  const resp1 = await fetchTodo(3)();
  // { userId: 1, id: 3, title: 'fugiat veniam minus', completed: false }
  console.log(resp1);
  const resp2 = await fetchTodo(0)();
  // Request failed with status code 404
  console.log(resp2);
};

main();