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nancy6547/README.md

Nancy Singh

I work on browser testing tools and LLM reliability. 2026 CS graduate, Delhi.

Open source

8 PRs merged into Google and Hugging Face projects, plus bugs I found in Microsoft Playwright and Twenty that their teams fixed.

  • Puppeteer 路 #15587 WebSocket handshake timeout 路 #15590 setGeolocation(null) clears the override 路 #15595 respond() skips undefined headers on CDP
  • Chrome DevTools MCP 路 #3144 路 #3148 路 #3198 路 #3199 console, network and Lighthouse fixes
  • sentence-transformers 路 #4204 PListMLE custom rank discount received a mask instead of ranks
  • Playwright 路 reported #43459, a codegen escaping bug, fixed in #43472
  • Twenty 路 reported #28342, Links field dropping slashes in query/hash, fixed in #28421

Projects
Junban Finds the API response order that breaks a flaky Playwright test. 6/6 rare races by run 5, vs 2 in 3,000 plain reruns.
Zeitaku Replaces hard-coded sleeps in Playwright tests with network-aware waits over CDP.
HalluGuard Flags RAG answer sentences their sources don't support, using an NLI cross-encoder.
Kensa Metamorphic testing for RAG apps.
DocMind Question answering over PDFs, scanned ones included, with hybrid search.

TypeScript 路 Python 路 Playwright 路 Chrome DevTools Protocol 路 PyTorch

nancy6547.github.io 路 LinkedIn 路 singhnancy2004@gmail.com

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  1. zeitaku zeitaku Public

    Finds hard-coded sleeps in Playwright tests and replaces them with network-aware waits, automatically (TypeScript Compiler API + CDP).

    TypeScript 1

  2. docmind docmind Public

    Ask questions about any PDF, including scanned ones. Hybrid retrieval, answers only from the document, every sentence verified with HalluGuard.

    Python

  3. junban junban Public

    Finds the network response order that breaks a flaky Playwright test and writes a repro that fails every time (CDP Fetch + delta debugging).

    TypeScript

  4. puppeteer/puppeteer puppeteer/puppeteer Public

    JavaScript API for Chrome and Firefox

    TypeScript 95.7k 9.6k

  5. halluguard halluguard Public

    Flags sentences in a RAG answer that its sources don't support, using sentence-level NLI with the backing passage. Evaluated on RAGTruth.

    Python

  6. ChromeDevTools/chrome-devtools-mcp ChromeDevTools/chrome-devtools-mcp Public

    Chrome DevTools for coding agents

    TypeScript 54.2k 5.9k