Plutus Playground Smart Contract

Playground.hs

import Data.Text qualified as T
import Playground.Contract
import Plutus.Contract
import PlutusTx.Prelude
import Prelude qualified as Haskell

hello :: Contract () EmptySchema T.Text ()
hello = logInfo @Haskell.String "Hello, world"

endpoints :: Contract () EmptySchema T.Text ()
endpoints = hello


type DummySchema = Endpoint "dummy" ()

mkSchemaDefinitions ''DummySchema

$(mkKnownCurrencies [])

Simulation.json

[0,[]]