\definefontfeature[robotofeatures][
  mode=node,
  ccmp=yes, % character composition
  liga=yes, tlig=yes, % ligatures
  pnum=yes,
  cpsp=yes, % capital spacing
  kern=yes,
  language=dflt,
  protrusion=quality,
  expansion=quality,
]

\definefontfeature[smallcaps][ % use with \addff
  smcp=yes, % smallcaps
  % c2sc=yes, % caps to smallcaps
]

\starttypescript[sans][roboto,robotosans]
  \definefontsynonym[Roboto-Regular][name:robotoregular]
  \definefontsynonym[Roboto-Black][name:robotoblack]
  \definefontsynonym[Roboto-BlackItalic][name:robotoblackitalic]
  \definefontsynonym[Roboto-Bold][name:robotobold]
  \definefontsynonym[Roboto-BoldItalic][name:robotobolditalic]
  \definefontsynonym[Roboto-Italic][name:robotoitalic]
  \definefontsynonym[Roboto-Light][name:robotolight]
  \definefontsynonym[Roboto-LightItalic][name:robotolightitalic]
  \definefontsynonym[Roboto-Medium][name:robotomedium]
  \definefontsynonym[Roboto-MediumItalic][name:robotomediumitalic]
  \definefontsynonym[Roboto-Italic][name:robotoitalic]
%  \definefontsynonym[Roboto-Regular][name:robotoregular]
  \definefontsynonym[Roboto-Thin][name:robotothin]
  \definefontsynonym[Roboto-ThinItalic][name:robotothinitalic]
\stoptypescript

\starttypescript[sans][roboto,robotosans][name]
  \definefontsynonym [SansThin]         [Roboto-Thin]        [features=robotofeatures]
  \definefontsynonym [SansThinItalic]   [Roboto-ThinItalic]  [features=robotofeatures]
  \definefontsynonym [SansThinSlanted]  [Roboto-ThinItalic]  [features=robotofeatures]
  \definefontsynonym [SansLight]        [Roboto-Light]       [features=robotofeatures]
  \definefontsynonym [SansLightItalic]  [Roboto-LightItalic] [features=robotofeatures]
  \definefontsynonym [SansLightSlanted] [Roboto-LightItalic] [features=robotofeatures]
  \definefontsynonym [Sans]             [Roboto-Regular]     [features=robotofeatures]
  \definefontsynonym [SansItalic]       [Roboto-Italic]      [features=robotofeatures]
  \definefontsynonym [SansSlanted]      [Roboto-Italic]      [features=robotofeatures]
  \definefontsynonym [SansCaps]         [Roboto-Regular]     [features={robotofeatures,smallcaps}]
  \definefontsynonym [SansMedium]       [Roboto-Medium]      [features=robotofeatures]
  \definefontsynonym [SansMediumItalic] [Roboto-MediumItalic][features=robotofeatures]
  \definefontsynonym [SansMediumSlanted][Roboto-MediumItalic][features=robotofeatures]
  \definefontsynonym [SansBold]         [Roboto-Bold]        [features=robotofeatures]
  \definefontsynonym [SansBoldItalic]   [Roboto-BoldItalic]  [features=robotofeatures]
  \definefontsynonym [SansBoldSlanted]  [Roboto-BoldItalic]  [features=robotofeatures]
  \definefontsynonym [SansBlack]        [Roboto-Black]       [features=robotofeatures]
  \definefontsynonym [SansBlackItalic]  [Roboto-BlackItalic] [features=robotofeatures]
  \definefontsynonym [SansBlackSlanted] [Roboto-BlackItalic] [features=robotofeatures]
\stoptypescript

\starttypescript[sans][roboto-light][name]
  \definefontsynonym [Sans]             [Roboto-Light]         [features=robotofeatures]
  \definefontsynonym [SansItalic]       [Roboto-LightItalic]   [features=robotofeatures]
  \definefontsynonym [SansSlanted]      [Roboto-LightItalic]   [features=robotofeatures]
  \definefontsynonym [SansCaps]         [Roboto-Light]         [features={robotofeatures,smallcaps}]
  \definefontsynonym [SansBold]         [Roboto-Medium]        [features=robotofeatures]
  \definefontsynonym [SansBoldItalic]   [Roboto-MediumItalic]  [features=robotofeatures]
  \definefontsynonym [SansBoldSlanted]  [Roboto-MediumItalic]  [features=robotofeatures]
\stoptypescript

\starttypescript[sans][roboto-medium][name]
  \definefontsynonym [Sans]             [Roboto-Medium]     [features=robotofeatures]
  \definefontsynonym [SansItalic]       [Roboto-MediumItalic]      [features=robotofeatures]
  \definefontsynonym [SansSlanted]      [Roboto-MediumItalic]      [features=robotofeatures]
  \definefontsynonym [SansCaps]         [Roboto-Medium]     [features={robotofeatures,smallcaps}]
  \definefontsynonym [SansBold]         [Roboto-Black]        [features=robotofeatures]
  \definefontsynonym [SansBoldItalic]   [Roboto-BlackItalic]  [features=robotofeatures]
  \definefontsynonym [SansBoldSlanted]  [Roboto-BlackItalic]  [features=robotofeatures]
\stoptypescript

\starttypescript[roboto]
  \definetypeface [roboto] [ss] [sans]  [roboto] [default]
\stoptypescript

\starttypescript[roboto-light]
  \definetypeface [roboto-light] [ss] [sans]  [roboto-light] [default]
\stoptypescript

\starttypescript[roboto-medium]
  \definetypeface [roboto-medium] [ss] [sans]  [roboto-medium] [default]
\stoptypescript