How to get LineString from Polygon reducing the applied buffer value

[anusreemn]

Hi,

I created a buffered polygon for a LineString segment using:
// featureGeoJson below is a LineString feature drawn on the map
const bufferedPolygon = turf.buffer(featureGeoJson, bufferVal, 'kilometers')

Is there any way I can process back LineString from the now available bufferedPolygon and bufferVal?

Note: featureGeoJson is not saved anywhere in our app now.