Use toDataURL() to output CMYK image, but get 'RangeError: unsupported number of channels: 5'

[YakumoAoi]

l use a random image in my pc to convert to CMYK, And it works well
But when l use a image dataURL from svg exported by Adobe Illustrator
l get such error message

js code

let image = await IJS.Image.load(imageUrl)
if (image.colorModel === 'CMYK') return imageUrl
let CMYKImage = image.cmyk()
return CMYKImage.toDataURL()

[faizulhaque]

There are 6 export methods available

  save(path: string, options?: SaveOptions): Promise<void>;
  toDataURL(type?: string, options?: SaveOptions): string;
  toBase64(type?: string, options?: SaveOptions): string | Promise<string>;
  toBuffer(options?: SaveOptions): Uint8Array;
  toBlob(type?: string, quality?: number): Promise<Blob>;
  getCanvas(): HTMLCanvasElement;

After converting image to cmyk
e.g.
let CMYKImage = image.cmyk()

None of the above export methods work. It doesn't matter whatever the type provided.

e.g.

for type: image/jpeg:

Error:
Uncaught (in promise) TypeError: The process: getRGBAData can only be applied if the number of components is in: 1,3 at Image.checkProcessable (checkProcessable.js:54:1)

for type: image/png:

Error:
PngEncoder.ts:156 Uncaught (in promise) RangeError: unsupported number of channels: 5 at getColorType (PngEncoder.ts:156:1) at PngEncoder._checkData (PngEncoder.ts:109:1) at new PngEncoder (PngEncoder.ts:33:1) at encodePng (index.ts:22:1) at encodePng (export.js:40:1) at dataUrl (export.js:130:1) at Image.toDataURL (export.js:137:1) at Image.toBase64 (export.js:183:1)

Can any one suggest which export method with type works after .cmyk() function.