"TypeError: graph.gen is not a function" when adding gen() as modulation on synth

Love concept of Gibber and learning it. Wondering if there is difference between playground website and local liberary. Why gen() works online but not working locally. Does I miss something?

--------------------------- html ---------------------------
<!doctype html>
<html lang='en'>

<head>
  <script src='./dist/gibber.audio.js'></script>
  <!-- <script src='./dist/gibberish_worklet.js'></script> -->
  <style> body{ background:black; color:white } </style>
</head>

<body>
  <p>click to start</p>
</body>

<script>

  Gibber
    .init({ workletPath:'./dist/gibberish_worklet.js' })
    .then( ()=> {
      Clock.bpm = 120

        bass = Synth('acidBass2', { saturation:20, gain:.3 })

        bass.note.tidal( '0 0 0 0 4 6 0 ~ 0 ~ 7 -7 ~ 0 -7 0' )
        bass.decay.seq( [1/32, 1/16], 1/2 )
        bass.glide.seq( [1,1,100,100 ], 1/4 )
        bass.Q = gen( 0.5 + cycle(0.1) * 0.49 ) //  <---------------------------------------------------- here

    })
</script>

</html>

gibber-cc / gibber

"TypeError: graph.gen is not a function" when adding gen() as modulation on synth #79