Case study: reducing a noisy TypeScript compiler message without losing the real mismatch

TypeScript errors often grow until the actual mismatch is hidden behind a wall of inferred types and repeated references. A smaller prompt works better when it preserves the file path, line number, error code, expected type, and received type while dropping the rest of the duplicate compiler output.

The lesson from this kind of example is that prompt compression should serve diagnosis, not aesthetics. The shorter version is useful because it exposes the mismatch faster, not because it looks cleaner.