Free Cursor rule
Strict TypeScript
Turn strict on. Handle every case in a union so a new case fails the build.
Download strict-typescript.mdc
The rule
--- description: TypeScript strict mode and exhaustive unions. globs: "**/*.ts,**/*.tsx" alwaysApply: false --- # Strict TypeScript - Keep `"strict": true`. Do not silence a new error with `any`. - For a union, the default branch should assign the value to `never` so a new case breaks the build. - Prefer a named type for a form payload over a bag of optional strings. - Parse outside data at the boundary. Inside the app, the type should already be true.
How to use it
Copy the rule into .cursor/rules/strict-typescript.mdc in your own project. It is free to use. It is a working habit from [Wann Labs](/), the public notes of BrandMatchGrowth, not a promise that your codebase will pass an audit.
If you want the same standard applied to a product people pay for, book a working session. The public product that came out of this shop-and-software work is OpenSign.