vscode - "Serial" no identifier defined

Friends! The "Serial" indicator is undefined :confused: . I work in VS Code. When outputting information via "Serial.println("text")" serial monitor shows nothing :( . The board as well as the speed are configured. What to do :( ?

Hello, Welcome.

What to do?

Read this again How to get the best out of this forum and please pay particular attention to the bit about posting code and asking a clear question. Then maybe when the problem is clear it will be easy to provide a helpful answer.

avsaushkiny: Friends! The "Serial" indicator is undefined

If you're only talking about the "problems" detection (as shown by the red squiggly underline or View > Problems), probably it's nothing to worry about. It's likely that the language server isn't able to fully process Arduino sketches.

avsaushkiny: When outputting information via "Serial.println("text")" serial monitor shows nothing :( . The board as well as the speed are configured.

As @PerryBebbington indicated, we would need to see a sketch you are using when you get this problem in order to be able to effectively provide assistance.

Intellisense in VSCode has been completely broken for a loooooong time. Get used to it.

https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.vscode-arduino