How to use the vega-lite/build/src/scale.ScaleType.LINEAR function in vega-lite

function createScaleFromType<output>(type: ScaleType) {
  switch (type) {
    case ScaleType.LINEAR:
      return scaleLinear<output>();
    case ScaleType.LOG:
      return scaleLog<output>();
    case ScaleType.POW:
      return scalePow<output>();
    case ScaleType.SQRT:
      return scaleSqrt<output>();
    case ScaleType.SYMLOG:
      return undefined;
    case ScaleType.TIME:
      return scaleTime<output>();
    case ScaleType.UTC:
      return scaleUtc<output>();
    case ScaleType.QUANTILE:
      return scaleQuantile<output>();
    case ScaleType.QUANTIZE:</output></output></output></output></output></output></output></output>

case 'Y':
      case 'Numeric':
        return ScaleType.POINT;
      case 'Color':
      case 'Category':
        return ScaleType.ORDINAL;
      default:
    }
  } else if (dataType === 'quantitative') {
    switch (channelType) {
      case 'XBand':
      case 'YBand':
      case 'X':
      case 'Y':
      case 'Numeric':
        return ScaleType.LINEAR;
      case 'Color':
        return isBinned ? ScaleType.LINEAR : ScaleType.BIN_ORDINAL;
      default:
    }
  } else if (dataType === 'temporal') {
    switch (channelType) {
      case 'XBand':
      case 'YBand':
      case 'X':
      case 'Y':
      case 'Numeric':
        return ScaleType.TIME;
      case 'Color':
        return ScaleType.LINEAR;
      default:
    }