Does an async function always need to be called with await?

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It is not necessary if your logic doesn’t require the result of the async call. Although not needed in your case, the documentation lists two benefits to having that warning enabled:

While this is generally not necessary, it gives two main benefits.
The first one is that you won’t forget to add ‘await’ when surrounding your code with try-catch.
The second one is that having explicit ‘await’ helps V8 runtime to provide async stack traces

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