Multi TS Discriminant Union

ts-multidu.ts

type PNGExtension = { extensionType: "PNG", pngRelatedConfig: string }
type JPEGExtension = { extensionType: "JPEG", jpegRelatedConfig: string }

type LineArt = { artType: "lineart", polylines: string[] }
type Shapes = { artType: "shapes", shapes: Shape[] }

type Art = LineArt | Shapes
type Extension = PNGExtension | JPEGExtension

type RenderMetadata = Art & Extension

const test: RenderMetadata = {
    extensionType: "PNG",
    pngRelatedConfig: "...",
    artType: "lineart",
    polylines: ["..."]
}

const getRendererForExtension = (x: Extension) => {
    switch(x.extensionType) {
        case "PNG":
            return getPNGRenderer(x.pngRelatedConfig)
        case "JPEG":
            return getJPEGRenderer(x.jpegRelatedConfig)
    }
}

const getPixelDataForArt = (x: Art) => {
      switch(x.artType) {
        case "lineart":
            return getPixelsForPolylines(x.polylines)
        case "shapes":
            return getPixelsForShapes(x.shapes)
    }
}

getRendererForExtension(test).render(getPixelDataForArt(test))