Signature declarations can only be used in TypeScript files is error in Step 3

[colleenpridemore]

why am I getting this error? I don't find anyone else getting this error.

[brunomsdev]

You probable got this error because you didn't add curly braces after it. I got the same error once and it was that.

[Neuwair]

To fix this error you need to include curly braces, try again.

[Lerenah3]

Dead bot.