% mode=mkiv
\usemodule[simplefonts]
\setmainfont[ALM Fixeddejavusans][features=arabic,range=arabic]% Some fonts have glyphs for ZWNJ, etc. Use the following to suppress them.\setcharacterstripping[1] % don't show ZWNJ, etc.
\setupdirections[bidi=global,method=one]
\setupalign[r2l]