Case Studyindexeddbwptllmtypescript
LLM Builds IndexedDB Implementation Passing Tests
8.2
An experiment used an LLM in a 'Ralph' agent loop to implement the IndexedDB API in TypeScript on Node.js over SQLite, targeting Web Platform Tests (WPT) compliance. The multi-agent run completed in a few hours and achieved roughly a 95% pass rate—1,208 of 1,272 targeted tests—demonstrating acceptance-test-driven LLM workflows can produce spec-compliant implementations.
Key Points
- 1Implemented IndexedDB in TypeScript on Node.js using an LLM and SQLite, reaching a 95% WPT pass rate
- 2Leveraged Web Platform Tests as formal acceptance tests to precisely measure web-compatibility and spec compliance
- 3Suggests test-driven LLM loops can produce production-grade, spec-compliant implementations with minimal human supervision
Scoring Rationale
Strong demonstrable LLM-driven engineering with concrete 95% WPT results, limited by single-project anecdotal evidence.
Sources
Public references used for this report.
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