Cache key expired or removed throws with "Cannot read properties of undefined (reading 'v')" #329
Description
When using node-cache in a TypeScript/Node.js project, I encounter the following error when calling .get() or .del() on a key that is missing or expired:
{
"type": "TypeError",
"message": "Cannot read properties of undefined (reading 'v')",
"stack":
TypeError: Cannot read properties of undefined (reading 'v')
at NodeCache._unwrap (/app/node_modules/node-cache/lib/node_cache.js:711:19)
at NodeCache.get (/app/node_modules/node-cache/lib/node_cache.js:368:23)
at setDocumentCache (file:///app/dist/utils/document.js:18:36)
at newDocumentFromData (file:///app/dist/utils/document.js:34:9)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async Object.getPdfMetadata (file:///app/dist/plugins/live-document-service.js:36:33)
at async Object.<anonymous> (file:///app/dist/routes/preview/pdf-metadata.js:86:19)
}Steps to Reproduce:
- Create a cache instance with
deleteOnExpire: false - Call .get() on a key that does not exist or has expired.
- The error occurs inside the library when it tries to access .v of undefined.
const documentCache = new NodeCache({
stdTTL: 60 * 2, // 2 minutes
useClones: false,
deleteOnExpire: false,
});
documentCache.on("expired", (key, pdfDocument) => {
if (typeof pdfDocument?.cleanup === "function") {
pdfDocument.cleanup();
}
documentCache.del(key);
});
function setDocumentCache(cacheKey: string, pdfDocument: PDFDocumentProxy) {
const existing = documentCache.get<PDFDocumentProxy>(cacheKey);
if (typeof existing?.cleanup === "function") {
existing.cleanup();
}
documentCache.set(cacheKey, pdfDocument);
}Expected Behavior:
Calling .get() on a missing or expired key should return undefined without throwing an error.
Environment:
- node-cache version: 5.1.2
- Node.js version: lts-bullseye
Additional Context:
Seems to be triggered by the library’s internal _unwrap method.