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SitePoint15 min readtutorialintermediate

Eliminating AI Code Hallucinations with TypeScript Compiler Diagnostics and TDD Loops

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Summary

The article shows how to replace raw TypeScript compiler output with a programmatic JSON feedback loop that merges diagnostics and Vitest test failures, feeding the structured data back to an LLM coding agent for self‑correction. It provides concrete code for extracting, enriching, validating, and de‑duplicating errors, and demonstrates token savings and deterministic iteration until compilation…

  • Use TypeScript's Compiler API (createProgram) to get typed diagnostics instead of parsing tsc CLI output.
  • Enrich each diagnostic with surrounding symbol info via ts-morph to give the agent clearer context.
  • Validate diagnostic and test‑failure payloads with Zod schemas before sending them to the LLM.
  • Merge diagnostics and Vitest programmatic test results into a compact JSON payload, reducing token usage by ~60% compared to raw output.

Teams building AI‑assisted code generation need deterministic, low‑token feedback to keep LLM agents from hallucinating TypeScript code.

6/10
llmtypescripttestingdiagnosticstdd

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