How to use the d3-ease.easeCubicOut function in d3-ease

import * as d3Ease from 'd3-ease';

let t_in: number = 0.5;
let t_out: number;

t_out = d3Ease.easeLinear(t_in);

t_out = d3Ease.easeQuad(t_in);
t_out = d3Ease.easeQuadIn(t_in);
t_out = d3Ease.easeQuadOut(t_in);
t_out = d3Ease.easeQuadInOut(t_in);

t_out = d3Ease.easeCubic(t_in);
t_out = d3Ease.easeCubicIn(t_in);
t_out = d3Ease.easeCubicOut(t_in);
t_out = d3Ease.easeCubicInOut(t_in);


let easePolyFactory: d3Ease.PolynomialEasingFactory;

easePolyFactory = d3Ease.easePoly;
easePolyFactory = d3Ease.easePoly.exponent(2);
t_out = easePolyFactory(t_in);

easePolyFactory = d3Ease.easePolyIn;
easePolyFactory = d3Ease.easePolyIn.exponent(2);
t_out = easePolyFactory(t_in);

easePolyFactory = d3Ease.easePolyOut;
easePolyFactory = d3Ease.easePolyOut.exponent(2);
t_out = easePolyFactory(t_in);

scrollTimer = timer(elapsed => {
    const t = easeCubicOut(Math.min(elapsed / duration, 1))

    window.scroll(0, Math.round(n(t)))

    if (t >= 1) {
      scrollTimer.stop()
    }
  })
}

const t = timer((elapsed) => {
      const te = easeCubicOut(timeScale(elapsed));

      const pathOffset = offsetScale(te);
      this.setState({ pathOffset });

      if (elapsed > duration) {
        window.setTimeout(() => this.restartTransition(), 2000);

        return t.stop();
      }
    });
  }

scrollTimer = timer(elapsed => {
    const t = easeCubicOut(Math.min(elapsed / duration, 1))

    window.scroll(0, Math.round(n(t)))

    if (t >= 1) {
      scrollTimer.stop()
    }
  })
}