How to use the itk/IntTypes.Int16 function in itk

function decompressImage(image) {
  if (!!image.data) {
    return Promise.resolve(image)
  }
  const byteArray = new Uint8Array(image.compressedData.buffer)
  const reducer = (accumulator, currentValue) => accumulator * currentValue
  const pixelCount = image.size.reduce(reducer, 1)
  let componentSize = null
  switch (image.imageType.componentType) {
    case IntTypes.Int8:
      componentSize = 1
      break
    case IntTypes.UInt8:
      componentSize = 1
      break
    case IntTypes.Int16:
      componentSize = 2
      break
    case IntTypes.UInt16:
      componentSize = 2
      break
    case IntTypes.Int32:
      componentSize = 4
      break
    case IntTypes.UInt32:
      componentSize = 4
      break
    case IntTypes.Int64:
      componentSize = 8
      break
    case IntTypes.UInt64:
      componentSize = 8