Checking if a message is empty with React Intl and Typescript

I have an app which uses React Intl and TypeScript.

I want to display a box with some info text, and I want it to be shown only if the text actually exists.

But I cannot do

<FormattedMessage id="my.id" />

because if my.id doesn't have a value, React Intl will fallback to the message id, i.e., my.id.

So what I tried to do was

const myId: string = 'myId';
const info: string = <FormattedMessage id={myId} />;
const infoExists: boolean = myId === info;

However, info is JSX.Element, not string.

Is there any way to do something like this?