The object's null status remains uncertain even after being checked for null

Currently, I am working with Typescript 2.8

This is the code snippet that I have:

class Wizard extends React.Componenet {

    private divElement: null | HTMLDivElement = null;

    componentDidUpdate(_: IWizardProps, prevState: IWizardState) {
        if (this.divElement) {
            this.getOverflowParent(this.divElement).scrollTop = 0;
        }
    }

}

I have added an if statement to avoid potential null values, but the compiler error persists, mentioning a possibility of it being null. Can anyone provide guidance on this issue?

https://i.sstatic.net/f9FrW.png

typescript

Answer №1

It is important to verify if 

this.getOverflowParent(this.divElement)
is null before accessing its scrollTop property. This way, avoid any potential errors in your code.

if (this.divElement) {
    var overflowParent = this.getOverflowParent(this.divElement);
    if (overflowParent)
        overflowParent.scrollTop = 0;
}

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