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Lint Rule Stress Testing

1 post · Sep 2025

What this trail covers

Vercel partners with Biome to stress test and strengthen their `noFloatingPromises` lint rule, developing creative test cases to identify subtle edge cases and ensure robust error handling in JavaScript and TypeScript.

All Vercel trails
  1. Stress testing Biome's noFloatingPromises lint ruleThis post details Vercel engineers' creative test cases for Biome's `noFloatingPromises` lint rule, including examples involving arrays of Promises, Promise-like objects, structural typing tricks, conditional type aliases, Proxy-based Promises, frozen Promise objects, Promise-returning object members, property getters, type remapping with getters, short-circuit operators, randomized expressions, and optional chaining fallbacks. It explains how these edge cases can lead to unhandled Promises and silent errors in production.