As mentioned, create-react-app doesnt let you configrue anything (ok, almost anything), and doesn't support LESS/Sass by design. Though you usually don't even

As mentioned, create-react-app doesnt let you configrue anything (ok, almost anything), and doesn't support LESS/Sass by design. Though you usually don't even need that much. Just using the node-sass or less compilers directly usually work fine. Or use something like Glamor or Styled Components to punt on the problem altogether.