Calling a global function from component element

Questions
1

Hello,
I have a @click event for a button inside component. That calls a function defined inside my app.js file. I’ve just learned that it can only call functions from inside the component scope.
Is there a solution to be able to call a function from the app.js file?
Best regards;

2

This worked:

@click=${() => MyFunction(params)}

nothing else worked

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