elixir-no-placeholders

Eliminate placeholder code by replacing dummy returns and TODOs with explicit error signaling using raise or not_implemented patterns. This enforces fail-fast behavior so errors surface immediately during development and testing rather than silently masking bugs with defaults.

Silent defaults hide missing or invalid data, making bugs harder to detect and debug. Explicit validation and error raising on unexpected inputs ensures you catch problems early and understand exactly where data validation failed.

Write a failing test for the function behavior you need, then replace the placeholder with an implementation that raises a clear error if incomplete. This guarantees the function fails loudly if requirements aren't met, preventing silent failures in production.

Yes, fail-fast applies to function implementations, data schemas, and configuration paths across development, testing, and CI workflows. Enforce explicit validation and error signaling at schema and config levels to catch issues before they propagate.

Avoid catch-all patterns that silently mask unexpected inputs. Use deterministic crashes with explicit error handling so unmatched cases fail loudly, making it clear when your function receives data it cannot handle.

Enforce fail-fast patterns through automated testing and validation in your CI pipeline to catch placeholder code, silent defaults, and unhandled edge cases before deployment, ensuring explicit error signaling throughout the build process.