/**
 * Returns the tangent vector (not necessarily of unit length) of an
 * order 0,1,2 or 3 bezier curve at a specific given parameter value `t`, i.e.
 * returns the `[x,y]` value of the once differentiated (with respect to `t`)
 * bezier curve's power basis when evaluated at `t`.
 *
 * * uses double precision calculations internally
 *
 * @param ps a linear, quadratic or cubic bezier, e.g. `[[0,0],[1,1],[2,1],[2,0]]`
 * @param t the t parameter
 *
 * @doc mdx
 */
declare function tangent(ps: number[][], t: number): number[];
export { tangent };