Guide TypeScript type design, boundary validation, and type-safety reviews when implementing or changing TypeScript code.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# TypeScript best practices
Follow the repository's TypeScript conventions and compiler settings. Strengthen types where they prevent a concrete invalid state or unsafe operation; avoid adding type machinery without a caller that needs it.
- Use discriminated unions for mutually exclusive states and exhaustive handling for closed variants.
- Parse external data from `unknown` at trust boundaries. Use established schemas and derive types from their authoritative definitions.
- Prefer narrowing or `satisfies` to assertions that hide a mismatch. When an assertion is unavoidable, keep it local to a verified invariant. `as const` is not an unsafe cast.
- Use branded primitives when confusing identifiers is a real risk, and non-empty collections only where an operation requires one.
- Preserve established function signatures, logging conventions, and test patterns unless the requested change requires otherwise.
Read [patterns](references/patterns.md) when a concrete example is needed. This skill does not require loading a second principle skill or running unrelated runtime tests.
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Source
GitHub
shiwenbin1617/pstack · 4 stars · license a license file GitHub does not identify · pushed 2026-09-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cpxp3fqjwfvhl5io
GET https://markdownregistry.com/api/v1/resolve?ref=shiwenbin1617/pstack/typescript-best-practices
GET https://markdownregistry.com/api/v1/blob/d593cd13cf39cb60db955f4050707da4e02274e34ed689faec6920a7cbb53298
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