How to use the d3-scale-chromatic.interpolateGreys function in d3-scale-chromatic

let BrBG: string = d3ScaleChromatic.interpolateBrBG(0); // rgb(84, 48, 5)
let PRGn: string = d3ScaleChromatic.interpolatePRGn(0); // rgb(64, 0, 75)
let PiYG: string = d3ScaleChromatic.interpolatePiYG(0); // rgb(142, 1, 82)
let PuOr: string = d3ScaleChromatic.interpolatePuOr(0); // rgb(127, 59, 8)
let RdBu: string = d3ScaleChromatic.interpolateRdBu(0); // rgb(103, 0, 31)
let RdGy: string = d3ScaleChromatic.interpolateRdGy(0); // rgb(103, 0, 31)
let RdYlBu: string = d3ScaleChromatic.interpolateRdYlBu(0); // rgb(103, 0, 31)
let RdYlGn: string = d3ScaleChromatic.interpolateRdYlGn(0); // rgb(103, 0, 31)
let Spectral: string = d3ScaleChromatic.interpolateSpectral(0); // rgb(158, 1, 66)

// -----------------------------------------------------------------------
// Sequential
// -----------------------------------------------------------------------
let Blue: string = d3ScaleChromatic.interpolateBlues(1); // rgb(8, 48, 107)
let Green: string = d3ScaleChromatic.interpolateGreens(1); // rgb(0, 68, 27)
let Grey: string = d3ScaleChromatic.interpolateGreys(1); // rgb(0, 0, 0)
let Orange: string = d3ScaleChromatic.interpolateOranges(1); // rgb(127, 39, 4)
let Purple: string = d3ScaleChromatic.interpolatePurples(1); // rgb(63, 0, 125)
let Red: string = d3ScaleChromatic.interpolateReds(1); // rgb(103, 0, 13)

// -----------------------------------------------------------------------
// Sequential(Multi-Hue)
// -----------------------------------------------------------------------
let BuGn: string = d3ScaleChromatic.interpolateBuGn(1); // rgb(0, 68, 27)
let BuPu: string = d3ScaleChromatic.interpolateBuPu(1); // rgb(77, 0, 75)
let GnBu: string = d3ScaleChromatic.interpolateGnBu(1); // rgb(8, 64, 129)
let OrRd: string = d3ScaleChromatic.interpolateOrRd(1); // rgb(127, 0, 0)
let PuBuGn: string = d3ScaleChromatic.interpolatePuBuGn(1); // rgb(1, 70, 54)
let PuBu: string = d3ScaleChromatic.interpolatePuBu(1); // rgb(2, 56, 88)
let PuRd: string = d3ScaleChromatic.interpolatePuRd(1); // rgb(103, 0, 31)
let RdPu: string = d3ScaleChromatic.interpolateRdPu(1); // rgb(73, 0, 106)
let YlGnBu: string = d3ScaleChromatic.interpolateYlGnBu(1); // rgb(8, 29, 88)

export const getColor = (value, defaultColor = [255, 255, 255]) => {
  if (!Number.isFinite(value)) {
    return defaultColor;
  }
  return interpolateGreys(value)
    .match(/[0-9]+/g)
    .map(n => Number(n));
};

render() {
		return (
			<div>
				
					
						
							Rosetta Home
						
					
				
			</div>
		);
	}
}