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Discussion on: 😲🤯The most outstanding new feature in Javascript you need to know about: Optional Chaining

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lampewebdev profile image
Michael "lampe" Lazarski Author

Thanks for mentioning this!

I don't work with TS that often but I think at some point they will support it :)

does TS support babeljs? if yes maybe they can work together right now? 🤔

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sent2null profile image
David Saintloth

I'm pretty sure typescript has something like this ... I know because my last angular project came to a point where I used the ? in a way similar to this to disambiguate values extracted from defined types in the app. Nothing major (it was my first project) but I definitely remember finding usage of "?" as a means of testing type attributes without using a long if condition with explicit null checking. I'll have to confirm by looking at my project code.

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devdrake0 profile image
Si

Are you maybe referring to Ternary operators?

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sent2null profile image
David Saintloth

Interestingly enough today at work I opened up the project in question and was unable to find where I used the "?" in the typescript. I think it may have been in an html file using an ng directive but had to switch off to other work before I finalized my search.

You could be right...I'll confirm again tomorrow.

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devdrake0 profile image
Si

Neither do I but it's what drives the syntax support in Visual Studio Code :)

So, even when just working with JavaScript, you may still get errors in VSC - even though it will run absolutely fine. It can throw some red herrings for devs who aren't aware why, so just thought I'd mention it.

Not for what I'm talking about, no. Whether TS and Babel can work, when writing TS, is a question for someone that uses TS :)

I'm referring to the VSC built-in JS/TS validator. It can be disabled by updating the settings.json file to include "javascript.validate.enable": false and/or "typescript.validate.enable": false. If they are disabled ESLint can take over and show the appropriate errors.

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lampewebdev profile image
Michael "lampe" Lazarski Author

Ahh okay yeah, that's true!

VSC will show an error if you don't configure it!

I just got used to seeing the error 🤣