'How to verify type script array of custom type objects are empty or not?

I want to test weather array of custom type objects are empty or not . Here '?' is not checking empty and running the code and failing in case empty messageArray.

messageArray?.forEach((message: BannerMessage) => {
      const outPutMessageObj: OutPutMessage = this.getOutPutMessageObject(message);
      processedMessages.push(outPutMessageObj);
    });

The error i am getting is

Uncaught (in promise) TypeError: messageArray.forEach is not a function

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'How to verify type script array of custom type objects are empty or not?

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