Common Bugs in Supermaven-Generated Code

Supermaven's completions are probabilistic — it predicts the most likely continuation, which is usually correct but occasionally produces plausible-looking errors. With 1M context, it can also be influenced by distant code that superficially resembles the current context

Supermaven's long-context completions sometimes extrapolate from patterns in the file and produce code that looks right but has subtle logical errors — an off-by-one in a loop, a negated condition, or a return value that should be the opposite sign. It may also complete function calls with argument order matching a different but similar API

Start by running your app through its complete user flow — sign up, use every feature, try edge cases like empty inputs and invalid data. Most Supermaven bugs surface when you go off the happy path. Use your browser's developer tools to watch for console errors, failed network requests, and unhandled promise rejections. TypeScript's strict mode will catch many issues at compile time if it's not already enabled.

For async errors, wrap every server-side operation in try/catch blocks and return meaningful error messages. For state bugs, consider whether the state belongs in the URL, in a server component, or in client state — Supermaven often defaults to client state when server state would be more appropriate. For data fetching issues, implement proper loading and error states for every data-dependent component.

The best way to prevent Supermaven bugs from reaching production: enable TypeScript strict mode, add ESLint rules for common mistakes (no-floating-promises, exhaustive-deps), and write tests for critical user flows. Even basic smoke tests catch the majority of issues.