Generate waveform while audio record

Is it possible to generate realtime waveform while recording audio ?

I’ve tried wavesurfer.js but can’t make it work.

It fails while fetching the stream because it depends on the variables:

var getUserMediaFn = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;

Are there any plugins that i’ve missed or is it just not possible ?

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