How To Avoid Nesting Promises In If Statement

I know we should not nesting promises in functions and all my functions are without any nesting at all however I can't figure out how to avoid nesting promises in if-else statement

Solution 1:

You can throw an error and catch it, as follows:

    const staffRef = db.collection("staff").doc(uid)
    return staffRef.get()
        .then((doc) => {
            if (doc.exists) {
                return staffRef.delete();
            } else {
                console.log("Employee ", uid, " had no dependencies")
                throw new Error("Employee " + uid + " had no dependencies");
            }
        })
        .then(() => {
            console.log("Employee ", uid, " profile has been deleted in staff collection");
            return null;
        })
        .catch(error => {
            console.log(error);
            return null;
        });