How to put a component inside another component in Angular 2?

I'm new at Angular, and I'm still trying to understand it. I've followed the course on the Microsoft Virtual Academy and it was great, but I found a little discrepancy between what they said and how my code behave! Specifically, I've tried to "put a component inside another component" like this:

@Component({
selector: 'parent',
directives: [ChildComponent],
template: `
<h1>Parent Component</h1>
<child></child>
`
})
export class ParentComponent{}


@Component({
selector: 'child',
template: `
<h4>Child Component</h4>
`
})
export class ChildComponent{}



This is the same example that they make on the course, but my code doesn't work! In particular VisualStudio says to me that the 'directives' property doesn't exist in the component decorator. How can I solve this?

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