transformTranslate must not be used with negative distances

[ozomer]

Intuitively I expected that using transformTranslate with a negative distance will transform the feature in 180 degrees. This is true for west-east transformations, but not for north-south transformations.
Example:

turf.transformTranslate(turf.point([0,0]), 10, 0); // gives a transformation towards north {"type":"Feature","properties":{},"geometry":{"type":"Point","coordinates":[0,0.08993203637245381]}}
turf.transformTranslate(turf.point([0,0]), -10, 0); // gives same as above, i.e. distance negativity is ignored: {"type":"Feature","properties":{},"geometry":{"type":"Point","coordinates":[0,0.08993203637245381]}}

turf.transformTranslate(turf.point([0,0]), 10, 90); // gives a transformation towards east as expected: {"type":"Feature","properties":{},"geometry":{"type":"Point","coordinates":[0.08993203637248826,5.5067490242164445e-18]}}
turf.transformTranslate(turf.point([0,0]), -10, 90); // gives a transformation towards west: {"type":"Feature","properties":{},"geometry":{"type":"Point","coordinates":[-0.08993203637248826,5.5067490242164445e-18]}}

Please add a warning in the docs for now.
In my opinion, future versions should treat negative distances by flipping the direction in 180 degress.

[stebogit]

Hey @ozomer thanks for your input.
Reading the code looks like the issue is here. The conversion for a negative direction (i.e. bearing) should be instead:

if (distance < 0) {
    distance = -distance;
    direction = direction + 180; // <--
}