Please update the latest version of less support

[Lfan-ke]

At present, the new Less if syntax and variable calculation syntax are not supported in this middleware, resulting in many unnecessary problems encountered during development.

Less DOC:

source:
overflow-x: if((@show), auto, hidden);

use lessc:

use your middleware:

[Lfan-ke]

bug: not support the less@4.2.0