fix: process null values

[Kindest13]

Fixes #1188
1 part for processing null values

[baywet]

thanks for starting this. I have left a number of comments to move it forward.

[baywet]

I think we're making good progress here! Thanks for the continuous efforts.

[Kindest13]

LGTM! @andrueastman for a final review

Great! I just comitted changes to remove .only from test file

[andrueastman]

LGTM.

@Kindest13 I believe you still need to reply to the policy service bot to get this merged.

[Kindest13]

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[baywet]

Now this PR is ready, I'd like us to get started on the generation updates before we merge this pull request.
@Kindest13 do you have all the information you need to get started in the kiota repository or do you want additional pointers?

[Kindest13]

Now this PR is ready, I'd like us to get started on the generation updates before we merge this pull request. @Kindest13 do you have all the information you need to get started in the kiota repository or do you want additional pointers?

Would be great if you can share more info on this

[baywet]

My guess is that since the ? is hardcoded here. And since only the properties need to be settable to null, we could probably hardcoded it here.
https://github.com/microsoft/kiota/blob/4d59461de79d1de58a309b4c25fee7b005a15ee5/src/Kiota.Builder/Writers/TypeScript/CodePropertyWriter.cs#L37

Let us know if you have additional questions.

[Kindest13]

My guess is that since the ? is hardcoded here. And since only the properties need to be settable to null, we could probably hardcoded it here.

I would ask to describe in more details what should be done.
As I'm not sure what should be hardcoded it here

[baywet]

| null roughly

[Kindest13]

| null roughly

Hey @baywet, is that correct?
So just this line?
writer.WriteLine($"{codeElement.Name.ToFirstCharacterLowerCase()}?: {returnType}{(isFlagEnum ? "[]" : string.Empty)} | null;");
microsoft/kiota#5106

[baywet]

yes it looks correct, however I left a couple of comments on the PR to wrap it up.