const bandStatistics = layer.rasterInfo.statistics[0];

const renderer = new RasterStretchRenderer({
  stretchType: "min-max",
  statistics: [{
    min: stretchSlider.minValue,
    max: stretchSlider.maxValue,
    avg: bandStatistics.avg,
    stddev: bandStatistics.stddev,
  }],
  numberOfStandardDeviations: 1,
  colorRamp: {
    type: "algorithmic",
    fromColor: [0, 0, 0, 0],
    toColor: [0, 0, 0, 1],
  },
});

layer.renderer = renderer;