I made it earlier, but not remember, how to custom File watcher for LESS -> CSS with autoprefixer. It was like
--no-color $FileName$ --autoprefix="last 5 versions"
but now it isn't working.
my File Watcher settings.
I won't use gulp or etc. I have Node.js + npm and Less / Sass support and autoprefixer plugins and less-plugin-autoprefix
I used npm install -g less-plugin-autoprefix
from this https://github.com/less/less-plugin-autoprefix
Works fine for me (Lessc 2.7.2, less-plugin-autoprefix 1.5.1)
.cls {
display: flex;
}
is transpiled into
.cls {
display: -ms-flexbox;
display: flex;
}