nl_tokens: Loads a single asset and sets the returned data to the loaded subobject of a given resource map
pl_tokens: function populateSingle ( filename , destination , key ) { return loadSingle ( filename ) . then ( function ( data ) { if ( data ) { /**
           * If the key points to an array in the destination map, then
           * we should also append to an array in the `loaded` section
           * of the map.
           *
           * This is useful for style resources, where `external.style` may
           * refer to a list of resources to be loaded.
           */ if ( Object . prototype . toString . call ( destination [ key ] ) === '[object Array]' ) { destination . loaded [ key ] = destination . loaded [ <mask> ] || [ ] ; destination . loaded [ key ] . push ( data ) ; } else { destination . loaded [ key ] = data ; } } } ) ; }