Tweenable.setBezierFunction('bezier-linear', 0.250, 0.250, 0.750, 0.750);
var tweenable = new Tweenable();
tweenable.tween({ from: {x:1}, to: {x:10}, easing: 'bezier-linear', duration: 1000});
Tweenable.interpolate({x:1}, {x:10}, 0.5, 'bezier-linear'); // 5
Tweenable.unsetBezierFunction('bezier-linear');Resources: