Extending Existing VSDX Files
The VsdxIO class can modify an existing VSDX file. The fromBlob method can parse a VSDX file blob to a VsdxPackage:
// create a vsdxIO instance with a vsdxPackage parsed from a given blob
const vsdxIO = await VsdxIO.fromBlob(blob)
// render the diagram on an existing page
await vsdxIO.addGraph({
graphComponent: graphComponent,
page: vsdxIO.vsdxPackage.pages.first()
})