I encountered a TS error warning about a possible null value, despite already confirming that the value

In line 5 of the script, TypeScript raises an issue regarding the possibility of gameInstanceContext.gameInstance being null. Interestingly, this concern is not present in line 3. Given that I have verified its existence on line 1, it is perplexing as to why TypeScript still flags it as potentially falsy on line 5.

    useEffect(() => {
        if (!gameInstanceContext.gameInstance) return

        console.log(gameInstanceContext.gameInstance.players) // No TypeScript complaint here
        const ft = () => {
            console.log(gameInstanceContext.gameInstance.players) // TypeScript raises a complaint
        }

        ft()
    }, [gameInstanceContext.gameInstance])

The type of gameInstanceContext.gameInstance is TGameInstance | null | undefined.

I'm puzzled as to why TypeScript is flagging gameInstanceContext.gameInstance as potentially null or undefined despite my validation steps. Any insights into this behavior?

Answer №1

In this code snippet, a lambda function is being defined without an initial if check to ensure it cannot be null or undefined. This lack of validation could potentially lead to issues in scenarios where the function is used in different contexts.

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