Typescript definition error for DocumentSnapshot.exists()

[gregfenton]

Operating System

all

Environment (if applicable)

React Native

Firebase SDK Version

10.12.1

Firebase SDK Product(s)

Firestore

Project Tooling

Expo/React-Native and React-Native-Firebase (which leverages Firebase Client SDK types file)

Detailed Problem Description

The TS type for DocumentSnapshot.exists() contains syntactically invalid code:

Steps and code to reproduce issue

Open the file (see image above) and see that invalid syntax.

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[wu-hui]

I think that is actually valid typescript, you can look up type predicates for details.