In computer language, when you try to say, "Hey, this thing is definitely a toy," but it's not always a toy, the computer gets confused. That's what this error is saying:

"'EventTarget' is not assignable to parameter of type 'Node'"

It means: "I expected you to give me a toy (a DOM element like a button), but you might have given me something else."

Solution
We need to make sure that the thing we get is really a toy (a clickable element) before we play with it.

In code, we can check like this:

Example in ReactJS:

function MyComponent() {
  const handleClick = (event: React.MouseEvent) => {
    const target = event.target; // This is like the thing you're clicking
    // Check if it's an actual element (a toy we can play with!)
    if (target instanceof HTMLElement) {
      console.log("You clicked on: ", target.tagName); // Now we know it's a toy (an HTML element)
    } else {
      console.log("This is not something we can use!");
    }
  };

  return (
    <div>
      <button onClick={handleClick}>Click Me!</button>
      <span onClick={handleClick}>Or Me!</span>
    </div>
  );
}

What's Happening:
When you click on something (like a button), the event gives us a thing.
We check if that thing is really a toy we can play with (an HTML element like a button or span).
If it is, we can play with it safely. If not, we just ignore it.
This way, we avoid confusing the computer and everything works perfectly!