C#
public class PlayerSM : StateMachine
{
    // [SerializeField] private static InputActionAsset playerActions;
    PlayerIdleState idleState;
    public PlayerSM() {
        idleState = new PlayerIdleState(this);
        currentState = idleState;
    }
    
}

C#
public class PlayerSM : StateMachine
{
    // [SerializeField] private static InputActionAsset playerActions;
    PlayerIdleState idleState;
    public PlayerSM() {
        idleState = new PlayerIdleState(this);
        currentState = idleState;
    }
    
}

C#
using UnityEngine;

public abstract class StateMachine : MonoBehaviour
{
    protected IState currentState {get; set;}

    void Start() {
        currentState.Start();
    }

    void Update() {
        currentState?.Update();
    }

    public void TransitionState(IState nextState) {
        currentState?.Exit();
        currentState = nextState;
        currentState.Start();
    }
}

C#
using UnityEngine;

public abstract class StateMachine : MonoBehaviour
{
    protected IState currentState {get; set;}

    void Start() {
        currentState.Start();
    }

    void Update() {
        currentState?.Update();
    }

    public void TransitionState(IState nextState) {
        currentState?.Exit();
        currentState = nextState;
        currentState.Start();
    }
}

C#
public class PlayerSM : StateMachine
{
    [SerializeField] private static InputActionAsset playerActions;
    static PlayerIdleState idleState = new PlayerIdleState(playerActions);
    This.currentState = idleState; // couldn't write any line like this
    PlayerSM.currentState = idleState; // or this, since neither exist in the current context, or so it says
    public PlayerSM(IState defaultState) : base(idleState) {}
    
}

C#
public class PlayerSM : StateMachine
{
    [SerializeField] private static InputActionAsset playerActions;
    static PlayerIdleState idleState = new PlayerIdleState(playerActions);
    This.currentState = idleState; // couldn't write any line like this
    PlayerSM.currentState = idleState; // or this, since neither exist in the current context, or so it says
    public PlayerSM(IState defaultState) : base(idleState) {}
    
}

C#
public abstract class StateMachine : MonoBehaviour
{
    protected IState currentState {get; private set;}

    // References to states goes here
    // e.g public IdleState idleState;

    public StateMachine(IState defaultState) {
        currentState = defaultState;
    }

    void Start() {
        currentState.Start();
    }

    void Update() {
        currentState?.Update();
    }

    public void TransitionState(IState nextState) {
        currentState?.Exit();
        currentState = nextState;
        currentState.Start();
    }
}

C#
public abstract class StateMachine : MonoBehaviour
{
    protected IState currentState {get; private set;}

    // References to states goes here
    // e.g public IdleState idleState;

    public StateMachine(IState defaultState) {
        currentState = defaultState;
    }

    void Start() {
        currentState.Start();
    }

    void Update() {
        currentState?.Update();
    }

    public void TransitionState(IState nextState) {
        currentState?.Exit();
        currentState = nextState;
        currentState.Start();
    }
}

C#
public class PlayerSM : StateMachine
{
    [SerializeField] private static InputActionAsset playerActions;
    PlayerIdleState idleState = new PlayerIdleState(playerActions);
    public PlayerSM(IState defaultState) : base(idleState) {}
    
}

C#
public class PlayerSM : StateMachine
{
    [SerializeField] private static InputActionAsset playerActions;
    PlayerIdleState idleState = new PlayerIdleState(playerActions);
    public PlayerSM(IState defaultState) : base(idleState) {}
    
}