React FunctionComponent type

React.FC or React.FunctionComponent is a generic utility type for defining a functional React component.

For example:

type ShoppingCartProps = {
    items?: Item[];
}

const ShoppingCart: React.FC<ShoppingCartProps> = ({
    items = [],
}) => {
    /* ... one must assume there's a component here ... */
}

Probably don't use it

This was removed as of Jan 2020 from the create-react-app template.

Instead it's recommended to use inline types on the props of the component:

const ShoppingCart = ({
    items = [],
}: ShoppingCartProps) => {
    - [ ] /* ... one must assume there's a component here ... */
}

To define a regular component type:

// Usually, instead of:
type MyComponent = React.FC<MyComponentProps>;

// You can:
type MyComponent = (props: MyComponentProps) => JSX.Element;