@typescript-eslint/no-floating-promises with const function declaration

Question

I'm having trouble understanding why the @typescript-eslint/no-floating-promises works with some, but not all my async functions.

In my understanding, the following 2 functions are equivalent

const getUser = async (userId: string): Promise<User> => {
  const userRef = await getUsersCollection().doc(userId).get()
  return userRef.data()
}

async function getUser2(userId: string) {
  const userRef = await getUsersCollection().doc(userId).get()
  return userRef.data()
}

How ever when I run npm lint (or look at my code in VS Code) only one call triggers the no floating promises error - why?

Answer 1

Because you didn't assign the result of the promise to anything.

Either assign it

const x = getUser2()

or handle it

getUser2().then(() => do something).catch(() => do something else)