How to Query (Almost) Everything
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Trustfall is a query engine that lets you query almost any data source — APIs, file formats, source code — using a unified graph-based query language. The author describes how their former employer used it to run ~40 cross-domain checks on every pull request, catching bugs like Python version mismatches between pyproject.toml and Dockerfiles, or type hints that are never actually checked by mypy. The system runs in ~0.3s per PR and prevented countless production incidents. Trustfall is architected like a compiler (front-end, IR, back-end) and requires only a small adapter (~hundreds of lines) to plug in a new data source. It now powers cargo-semver-checks for Rust semantic versioning checking.
