Microsoft Shared instructions: shared-instructions.md - read first.
Add PDF Report
Internal helper. Users should invoke /add-native pdf-report, /add-native generate-pdf, or /add-native pdf-export; /add-native routes here after resolving the capability.
Generate or verify a local PDF report wrapper for app-owned PDFs created from records, evidence, certificates, receipts, or summaries. This helper uses expo-print to create a local PDF file URI. It may use expo-sharing only when that package is already present. It never installs packages or imports the native PDF viewer directly.
Capability boundaries
| User need | Correct path |
|---|---|
| Generate/export/print a report from app data | This helper: expo-print -> local PDF URI |
| Share the generated local PDF from the device | Add share method only if expo-sharing is already in package.json |
| Retain the generated PDF in Dataverse | Create/update parent row first, then upload to a Dataverse File column with generated services |
| Open an existing HTTPS or local file PDF in the Power Apps native viewer | /add-native pdf-viewer, only if @microsoft/power-apps-native-pdf-viewer 0.2.9+ is already present |
| Pick/import/upload a user-selected PDF | /add-native document-picker or host <FilePicker> for Dataverse File columns |
Local generated PDFs are usually file:// URIs and can be passed to openHttpsPdf(...) with @microsoft/power-apps-native-pdf-viewer 0.2.9+.
Steps
1. Verify app
test -f app.config.js && test -f power.config.json && test -f package.json && test -d src
If this fails, tell the user to run /create-mobile-app first and STOP.
2. Verify packages are already present
expo-print is required. expo-sharing is optional unless the plan specifically needs sharing behavior.
node -e "const p=require('./package.json'); const deps={...p.dependencies,...p.devDependencies}; const required='expo-print'; if (!deps[required]) { console.error('MISSING: expo-print is not in package.json. The template/app must already ship it for /add-native pdf-report. This skill will not install it or edit native config. Capability not added.'); process.exit(1); } console.log('OK: expo-print package present'); console.log(deps['expo-sharing'] ? 'OK: expo-sharing package present' : 'OPTIONAL_MISSING: expo-sharing is not in package.json; generated PDFs can be created/viewed/uploaded, but sharing helpers must not be generated.');"
If expo-print is missing, STOP. Do not run npm install, npx expo install, pod install, or edit app.config.js. Do not add pdf-report to the plan or generated wrappers for this app.
If expo-sharing is missing:
- Continue for generate-only, native-viewer preview, or Dataverse-upload flows.
- Do not import
expo-sharing. - Do not generate
sharePdfReport(...). - If the user's requirement specifically includes sharing, STOP and say sharing is not supported by this template.
3. Write or verify src/native/pdfReport.ts
Create src/native/pdfReport.ts if it does not exist. If it already exists, inspect it and patch only if it throws instead of returning a result, imports missing packages, or routes local URIs to the native PDF viewer.
The wrapper MUST:
- Import
expo-printonly after Step 2 confirms it is present. - Import
expo-sharingonly when Step 2 confirms it is present. - Return discriminated unions and never throw.
- Treat generated local PDFs as local files for view/share/upload flows.
- Never import
@microsoft/power-apps-native-pdf-viewerdirectly from this wrapper. - Keep HTML generation deterministic and app-owned; do not fetch remote HTML inside the wrapper.
Base wrapper when expo-sharing is present:
// src/native/pdfReport.ts
import * as Print from 'expo-print';
import * as Sharing from 'expo-sharing';
export type PdfReportResult =
| { ok: true; uri: string; numberOfPages?: number; base64?: string }
| { ok: false; reason: 'EMPTY_HTML' | 'PRINT_FAILED'; message?: string };
export type PdfShareResult =
| { ok: true }
| { ok: false; reason: 'INVALID_URI' | 'SHARING_UNAVAILABLE' | 'SHARE_FAILED'; message?: string };
export function escapePdfHtml(value: string): string {
return value
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/"/g, '"')
.replace(/'/g, ''');
}
export function wrapPdfDocument(input: { title: string; bodyHtml: string; styles?: string }): string {
const title = escapePdfHtml(input.title.trim() || 'Report');
return `<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>${title}</title>
<style>
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; margin: 32px; color: #111827; }
h1, h2, h3 { margin: 0 0 12px; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid #e5e7eb; padding: 8px; text-align: left; }
${input.styles ?? ''}
</style>
</head>
<body>${input.bodyHtml}</body>
</html>`;
}
export async function createPdfReport(
html: string,
options?: { includeBase64?: boolean },
): Promise<PdfReportResult> {
if (!html.trim()) {
return { ok: false, reason: 'EMPTY_HTML', message: 'PDF report HTML is empty.' };
}
try {
const result = await Print.printToFileAsync({
html,
base64: options?.includeBase64 ?? false,
});
return {
ok: true,
uri: result.uri,
numberOfPages: result.numberOfPages,
base64: result.base64,
};
} catch (error: any) {
return { ok: false, reason: 'PRINT_FAILED', message: error?.message ?? String(error) };
}
}
export async function sharePdfReport(uri: string, options?: { dialogTitle?: string }): Promise<PdfShareResult> {
if (!uri || !uri.startsWith('file://')) {
return { ok: false, reason: 'INVALID_URI', message: 'Generated PDF reports must be shared from a local file URI.' };
}
try {
const available = await Sharing.isAvailableAsync();
if (!available) {
return { ok: false, reason: 'SHARING_UNAVAILABLE', message: 'Sharing is not available on this platform.' };
}
await Sharing.shareAsync(uri, {
mimeType: 'application/pdf',
UTI: 'com.adobe.pdf',
dialogTitle: options?.dialogTitle ?? 'Share PDF report',
});
return { ok: true };
} catch (error: any) {
return { ok: false, reason: 'SHARE_FAILED', message: error?.message ?? String(error) };
}
}
When expo-sharing is absent, generate the same file without the expo-sharing import, without PdfShareResult, and without sharePdfReport(...). Keep createPdfReport(...), wrapPdfDocument(...), and escapePdfHtml(...).
4. Use the wrapper
Screens import the wrapper, not Expo modules directly:
import { createPdfReport, escapePdfHtml, sharePdfReport, wrapPdfDocument } from '@/native/pdfReport';
const html = wrapPdfDocument({
title: 'Inspection report',
bodyHtml: `<h1>Inspection report</h1><p>${escapePdfHtml(summary)}</p>`,
});
const report = await createPdfReport(html);
if (!report.ok) {
showError(report.message ?? 'Report PDF was not generated.');
return;
}
const share = await sharePdfReport(report.uri, { dialogTitle: 'Share inspection report' });
if (!share.ok) {
showError(share.message ?? 'Report PDF was generated but could not be shared.');
}
If expo-sharing is absent, screens may still call createPdfReport(...), preview the returned file:// URI through native PDF viewer 0.2.9+, or upload it to a Dataverse File column through generated services. They must not render a Share button.
5. Optional Dataverse upload
Retained PDFs use Dataverse File columns. Save or update the parent row first, verify success, then upload a payload compatible with the generated service's upload(id, columnName, file, fileDisplayName?) signature. Never put File column bytes in create/update JSON.
const save = await Cr123_inspectionService.update(inspectionId, {
cr123_reportgeneratedat: new Date().toISOString(),
});
if (!save.success) {
showError(save.error?.message ?? 'Inspection was not saved.');
return;
}
const report = await createPdfReport(html, { includeBase64: true });
if (!report.ok) {
showError(report.message ?? 'Report PDF was not generated.');
return;
}
if (!report.base64) {
showError('Report PDF was generated but could not be prepared for upload.');
return;
}
// Convert report.base64 into the File/blob/picked-file shape expected by the generated service.
// Do not pass report.uri unless the generated service explicitly documents URI support.
const reportFile = createUploadFileFromBase64(report.base64, 'inspection-report.pdf', 'application/pdf');
const upload = await Cr123_inspectionService.upload(
inspectionId,
'cr123_reportfile',
reportFile,
'inspection-report.pdf',
);
if (!upload.success) {
showError(upload.error?.message ?? 'Report PDF was not uploaded.');
}
createUploadFileFromBase64(...) is intentionally app-specific because generated upload helpers may expect a browser File, a host PickedFileInfo, bytes, or another service-specific payload shape. Use the model/service types generated for that table and do not edit generated services.
6. Type-check
npx tsc --noEmit
Fix any TypeScript errors before rebuilding.
7. Native rebuild note
This skill does not install native code. If expo-print or expo-sharing was just added outside the skill, the app needs a native rebuild outside this workflow. If the packages were already in the build, Metro hot reload is enough for wrapper edits.
8. Summary
Tell the user:
PDF report helper added
Required package : expo-print
Optional share : expo-sharing <present | absent>
Wrapper : src/native/pdfReport.ts
Output : local PDF file URI
Native viewer : optional; 0.2.9+ can open the generated file:// URI
Type-check : PASS
Native rebuild : not performed by this skill
Update memory-bank.md under Controls:
- PDF report helper added - expo-print local generation, expo-sharing <present|absent> (<ISO date>)