arthurgubaidullin

import * as E from 'fp-ts/Either';

// 1.

const MY_VAR_UNSAFE: string | undefined = process.env['MY_VAR'];

const MY_VAR_NOT_DEFINED = 'Environment variable MY_VAR not set.' as const;

const MY_VAR_EITHER: E.Either<typeof MY_VAR_NOT_DEFINED, string> =
  MY_VAR_UNSAFE !== undefined

arthurgubaidullin

type person = Streamer(string) | Mr(string)

let kirJs = Streamer("KirJS")

let mrLapteuh = Mr("Lapteuh")

let say = person =>
  switch person {
  | Streamer(name) => name ++ ": " ++ "Yes, mr. Lapteuh." ++ "\n"
  | Mr(name) => "Mr. " ++ name ++ ": " ++ "Say my name!" ++ "\n"

arthurgubaidullin

interface InternalEventBrand {
  readonly Internal: unique symbol;
}

type User = {}

type AuthorizedEvent = { type: 'AUTHORIZED'; user: User } & InternalEventBrand;

function authorized(user: User): AuthorizedEvent {
  return { type: 'AUTHORIZED', user } as AuthorizedEvent;

arthurgubaidullin

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions