nl_tokens: Signal Number
pl_tokens: function fps ( desiredFps ) { var msPerFrame = 1000 / desiredFps return signal ( function ( next ) { var prev = Date . now ( ) setTimeout ( tick , msPerFrame ) function tick ( ) { var curr = <mask> . now ( ) var diff = curr - prev prev = curr next ( diff ) setTimeout ( tick , msPerFrame ) } } , 0 ) }