@typed-firestore/server/src/utils/is-present.ts

Elegant, typed abstractions for Firestore in server environments

export function isPresent<T>(t: T | undefined | null): t is T {
  return t !== undefined && t !== null;
}

export function isDefined<T>(t: T | undefined): t is T {
  return t !== undefined;
}

export function isFilled<T>(t: T | null): t is T {
  return t !== null;
}