TypeScript best practices. Use when reading or editing any .ts or .tsx file.
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What the file says
# TypeScript best practices
Apply **principle-type-system-discipline** (`${CLAUDE_SKILL_DIR}/../poteto-mode/principles/principle-type-system-discipline.md`) first.
| Rule | Summary |
|------|---------|
| Discriminated unions | Model variants with a `kind` literal discriminant so impossible states can't be represented. No optional-field bags. |
| Branded types | Brand primitives with `& { readonly __brand: "X" }` so they can't be mixed up. Validate once at the boundary. |
| Constructive modeling | Build the shape so the illegal value can't be constructed. `[T, ...T[]]` for non-empty, `[T, T][]` for even length, `start` plus `duration` for a range. Not a runtime guard, not a wish for refinement types. |
| Simplest total type | Keep `T[]` while every operation on it stays total. Strengthen to `NonEmpty<T>` only where the loose type forces `!`, a cast, or a "should never happen" throw. |
| `unknown` over `any` | External data is `unknown`. |
| Schemas before guards | Before hand-writing a property-by-property type guard, use the repository's runtime schema library and infer the type from the schema, such as `z.infer`. |
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The line at the top of this page pins the label git:20260923.11fd787, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_ntppumkwrew4xq56
GET https://markdownregistry.com/api/v1/resolve?ref=lucasheriques/pstack/typescript-best-practices
GET https://markdownregistry.com/api/v1/blob/08a59ab1b2e1d6c72f13fb0716abb04b005a24cf9c4a8084ed1a4836c6275a62
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