SOURCE

var line1 = turf.lineString([
    [
        119.54801177978516,
        35.41238784790039
    ],
    [
        119.55059814453125,
        35.40992736816406
    ],
    [
        119.55061340332031,
        35.40755844116211
    ]
]);
var line2 = turf.lineString([
    [
        119.54632568359375,
        35.4094352722168
    ],
    [
        119.54887390136719,
        35.41168212890625
    ],
    [
        119.55057525634766,
        35.413352966308594
    ]
]);

var overlapping = turf.lineOverlap(line1, line2);

console.log(overlapping)