Operations

Buffer

    var point = Shapely.point( [0, 0] );
    var buffer = point.buffer( 1 ); 

Envelope

    var line = Shapely.line( [ [0, 0], [2, 2], [4, 4] ] );
    var envelope = line.envelope();
    console.log(envelope.coords);
    // [ [0, 0], [0, 4], [4, 4], [4, 0], [0, 0] ]