This throws me string null is not assignable to type string error

Question

I got the following code and it gives me error Type 'string | null' is not assignable to type 'string'. Type 'null' is not assignable to type 'string'.

this.userId = authInformation.userId;

So I'm trying to check if authInformation.userId returns null and If it's null, do nothing, if it's not null this.userId should be set to authInformation.userId. And it still has an error and I don't know what's the error.

const usertypecheck = authInformation.userId;
this.userId = usertypecheck !==null ? "" : usertypecheck;

Md Sabbir Alam · Accepted Answer · 2021-01-20 09:47:23Z

1

You are doing it wrong, reverse the logic here from ,

this.userId = usertypecheck !==null ? "" : usertypecheck;

to

this.userId = usertypecheck === null ? "" : usertypecheck;

That should solve the problem.

answered Jan 20, 2021 at 9:47

Md Sabbir Alam

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