This is useful for when you want to use a bitmap font (e.g. Terminus) for the editor, while keeping workbench font antialiased.
Edit stylesheet
vim /Applications/Visual\ Studio\ Code.app/Contents/Resources/app/out/vs/workbench/workbench.main.css
The classname for the editor already exists in the stylesheet. Add the following declaration to it at the top of the file.
.editor-container {
-webkit-font-smoothing: none;
}
Restart VS Code