At work, I was making a react component that can accept additional parameters, but I wanted to make the ide swear that if it didn’t pass a flag or some other prop

This led me to the next task

type ItemBase = {
    title: string
    //any other fields
}

type ItemFlagged = {
    flag: true
    additionField: string
}

type ItemNonFlagged = {
    // empty object type
}

type ItemOptions = ItemFlagged | ItemNonFlagged

type Item = any //???

const a: Item = {
    title: 'some'
}

const b: Item = {
    title: 'some',
    flag: true,
    additionField: 'test'
}

// @ts-expect-error
const c: Item = {
    title: 'c',
    additionField: 'call'
}

Can you tell me if it is possible to make such a type, if so, then show how, and if not, what causes it

Thank you in advance