SKILL.md
Integrate CogniteFileViewer
Add CogniteFileViewer to this Dune app to preview CDF files (PDF, image, text).
Your job
Complete these steps in order. Read each file before modifying it.
Step 1 — Understand the app
Read these files before touching anything:
package.json— detect package manager (packageManagerfield or lock file) and existing deps
vite.config.ts— understand current Vite setup
- The component where the viewer should be added
Step 2 — Install dependencies
- pnpm →
pnpm add "github:cognitedata/dune-industrial-components#semver:*" react-pdf
- npm →
npm install "github:cognitedata/dune-industrial-components#semver:*" react-pdf
- yarn →
yarn add "github:cognitedata/dune-industrial-components#semver:*" react-pdf
pdfjs-dist ships as a dependency of react-pdf at the correct version — do not install it separately.
Step 3 — Configure the PDF.js worker
The consumer app must configure the PDF.js worker. This ensures the worker version matches the pdfjs-dist version shipped with your react-pdf install.
Add this setup in the same file where CogniteFileViewer is used (module execution order matters):
import { pdfjs } from 'react-pdf';
pdfjs.GlobalWorkerOptions.workerSrc = new URL(
'pdfjs-dist/build/pdf.worker.min.mjs',
import.meta.url,
).toString();pnpm users: pnpm's strict linking may prevent the browser from resolving pdfjs-dist. Either add pdfjs-dist as a direct dependency (pnpm add pdfjs-dist), or add public-hoist-pattern[]=pdfjs-dist to .npmrc.
Step 4 — Configure Vite
Add optimizeDeps.exclude: ['pdfjs-dist'] to vite.config.ts to prevent Vite from pre-bundling pdfjs-dist (which breaks the worker):
export default defineConfig({
// ... existing config ...
optimizeDeps: {
exclude: ['pdfjs-dist'],
},
});Step 5 — Use the component
Import and render CogniteFileViewer wherever a file preview is needed.
import { CogniteFileViewer } from '@cognite/dune-industrial-components/file-viewer';Get the sdk from the useDune() hook (already available in every Dune app):
import { useDune } from '@cognite/dune';
const { sdk } = useDune();Supported file types
Type
Formats
.pdf — page navigation, zoom, pan, diagram annotation overlay
Office documents
Word, PowerPoint, Excel, ODS, ODP, ODT, RTF, TSV — converted to PDF via the CDF Document Preview API, then rendered identically to PDF
Image
JPEG, PNG, WebP, SVG, TIFF — zoom, pan, rotation
Text
.txt, .csv, .json — rendered as preformatted text
Other
Falls back to renderUnsupported
Minimal usage
This is all you need — zoom, pan, and touch gestures are handled internally:
<CogniteFileViewer
source={{ type: 'internalId', id: file.id }}
client={sdk}
style={{ width: '100%', height: '600px' }}
/>The component needs a defined height. If the parent has no explicit height, the viewer will collapse to zero. Always set a height via style, className, or the parent container.
File source
Pass any of three source types:
// By instance ID (data-modelled file — enables annotations)
<CogniteFileViewer
source={{ type: 'instanceId', space: 'my-space', externalId: 'my-file' }}
client={sdk}
/>
// By CDF internal ID
<CogniteFileViewer
source={{ type: 'internalId', id: 12345 }}
client={sdk}
/>
// By direct URL
<CogniteFileViewer
source={{ type: 'url', url: 'https://...', mimeType: 'application/pdf' }}
/>**Prefer instanceId when available** — it's the only source type that enables the diagram annotation overlay. When listing files via sdk.files.list(), check file.instanceId first:
source={
file.instanceId
? { type: 'instanceId', space: file.instanceId.space, externalId: file.instanceId.externalId }
: { type: 'internalId', id: file.id }
}Full props reference
<CogniteFileViewer
// Required
source={source}
client={sdk} // required for instanceId and internalId sources
// PDF pagination
page={page} // controlled current page (1-indexed)
onPageChange={setPage}
onDocumentLoad={({ numPages }) => setNumPages(numPages)}
// Zoom & pan (works on PDF and images)
zoom={zoom} // 1 = 100%; Ctrl/Cmd+wheel, pinch-to-zoom, and middle-click drag built in
onZoomChange={setZoom}
minZoom={0.25} // default
maxZoom={5} // default
panOffset={pan} // controlled pan offset; resets on page change
onPanChange={setPan}
// Fit mode
fitMode="width" // 'width' fits to container width; 'page' fits entire page in container
// Rotation (PDFs and images)
rotation={rotation} // 0 | 90 | 180 | 270
// Diagram annotations (instanceId sources only)
showAnnotations={true} // default
onAnnotationClick={(annotation) => { /* annotation.linkedResource has space + externalId */ }}
onAnnotationHover={(annotation) => {}}
// Custom annotation tooltip (replaces native <title> tooltip)
renderAnnotationTooltip={(annotation, rect) => (
<div style={{
position: 'absolute',
left: rect.x + rect.width,
top: rect.y,
zIndex: 11,
}}>
{annotation.text}
</div>
)}
// Custom overlay (SVG paths, highlights, drawings — works on PDF and images)
renderOverlay={({ width, height, originalWidth, originalHeight, pageNumber, rotation }) => (
<svg
width={width}
height={height}
viewBox={`0 0 ${originalWidth} ${originalHeight}`}
preserveAspectRatio="none"
style={{ position: 'absolute', top: 0, left: 0, pointerEvents: 'all' }}
>
<path d="..." stroke="cyan" fill="none" />
</svg>
)}
// Custom renderers (all optional)
renderLoading={() => <MySpinner />}
renderError={(error) => <MyError message={error.message} />}
renderUnsupported={(mimeType) => <div>Cannot preview {mimeType}</div>}
// Layout
className="..."
style={{ width: '100%', height: '100%' }}
/>Tips & tricks
Reset page, zoom and rotation when the source changes.
The component does not reset these automatically when you switch files — do it yourself:
const navigateToFile = (file: FileInfo) => {
setSelectedFile(file);
setPage(1);
setZoom(1);
setRotation(0);
};**Gate pagination UI on numPages > 0.**
onDocumentLoad only fires for PDFs. Don't render pagination controls until you know there are pages to paginate:
{numPages > 0 && (
<>
<button disabled={page <= 1} onClick={() => setPage(p => p - 1)}>‹</button>
<span>{page} / {numPages}</span>
<button disabled={page >= numPages} onClick={() => setPage(p => p + 1)}>›</button>
</>
)}Annotation click → navigate to linked file.
annotation.linkedResource contains the space and externalId of the linked CDF instance. Match it against file.instanceId to navigate:
onAnnotationClick={(annotation) => {
if (!annotation.linkedResource) return;
const { space, externalId } = annotation.linkedResource;
const linked = files.find(
f => f.instanceId?.space === space && f.instanceId?.externalId === externalId
);
if (linked) navigateToFile(linked);
}}Touch support is built in. Two-finger pinch-to-zoom and two-finger drag-to-pan work on touch devices automatically. No configuration needed.
Pan is middle-click drag (when zoomed in) on desktop. Left-click remains free for annotation clicks and text selection.
Ctrl/Cmd + wheel zooms toward the cursor — also built in. Wire zoom/onZoomChange if you want programmatic zoom buttons or to persist zoom state; otherwise it works fully uncontrolled.
**renderOverlay receives original page dimensions** (originalWidth, originalHeight) so you can set up an SVG viewBox in the original coordinate space. Paths drawn in PDF-point or image-pixel coordinates will map correctly to the rendered page at any zoom level.
Common pitfalls
Problem
Cause
Fix
Failed to resolve module specifier 'pdf.worker.mjs'
Worker not configured
Add the worker setup from Step 3 in the same file that uses CogniteFileViewer
API version does not match Worker version
pdfjs-dist version mismatch between app and react-pdf
Do not install pdfjs-dist separately — let react-pdf provide it. If already installed, remove it
Annotations never show
instanceId is undefined — annotation overlay is disabled without it
Use instanceId source, or fall back and accept no annotations for classic files
Annotations show but are empty
File has no CogniteDiagramAnnotation edges in CDF
Expected — only P&ID/diagram files synced to the data model have annotations
Viewer collapses to zero height
Parent has no explicit height
Set height via style, className, or parent CSS