Function: CubicBezierEase()

function CubicBezierEase(
   x1, 
   y1, 
   x2, 
   y2, 
   t
): number;

CSS cubic-bezier timing: the curve's y where its x equals t. x(s) is solved for s by Newton steps, falling back to bisection where the slope is flat — no allocation, it runs per curve per tick.

Parameters

Parameter	Type
x1	number
y1	number
x2	number
y2	number
t	number

Returns

number