A personal story about a frustrating tax form highlights common UX failures like unclear requirements and delayed feedback.
Existing validation solutions often lack structure, are hard to test, and create tight coupling with UI frameworks.
Vest is inspired by unit testing libraries like Mocha and Jest to create declarative, readable, and separate validation suites.
Learn how to create a validation suite with Vest, connect it to a React form, and display error messages for individual fields.
Use Vest's `only` function to validate a single field on interaction and implement non-blocking warnings for optional suggestions.
Manage asynchronous server-side checks, skip them conditionally with `skipWhen`, and prevent redundant calls using memoization.
Vest is a tiny, stateful library that offers declarative, framework-agnostic validations, with a full TypeScript rewrite in version 4.
Learn how to handle debounced async calls, define global rules by extending `enforce`, and manage dynamic forms with `test.each` or manual cleanup.
Jobs that call for the skills explored in this talk.