type AActionType = 'AAction';
const AActionType: AActionType = 'AAction';

type BActionType = 'BAction';
const BActionType: BActionType = 'BAction';

type CActionType = 'CAction';
const CActionType: CActionType = 'CAction';

interface Person{
    name: string;
    age: number;
    height: number;
}

interface Action{
    $name;
}

interface AAction extends Action{
    $name: AActionType;
    aProp: number;
}

interface BAction extends Action{
    $name: BActionType;
    bProp: string;
}

interface CAction extends Action{
    $name: CActionType;
    cProp: Person;
}

type Actions = AAction | BAction | CAction;

function handleAction(action: Actions){
    if (action.$name === CActionType){
        action.cProp.name;
    }
}