jsmanifest

Deterministic validation hooks for AI-generated code. Stop type errors, security holes, and test failures before Claude commits them to your repository.

Master keyof typeof to build type-safe config objects, route maps, and registries. Learn when this pattern beats enums and where runtime validation takes over.

The downlevelIteration flag controls how TypeScript transpiles Map, Set, and array iteration to older JavaScript. Production builds still break without it because the default transpilation produces index-based loops that fail on iterables. Here's what actually happens and when you must enable it.