Do text editors (like VS Code) use their own code editors? Or do they use for example CodeMirror?

Question

Text editors

I wanted to write an electron application. I need a code editor
Do text editors (like VS Code or Atom) use their own code editors? Or do they use for example CodeMirror?
If not, is it difficult to write your own code editor? Or is it better to use a ready-made solution?

Answer 1

Own
There are monaco-editor, ace and even a cloud of spawning on Habré