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typescript-best-practices

Use when TypeScript needs shaping toward narrow types, unions, exhaustive variants, and strict flags. Not for error repair: use typescript-type-hardening. Not for non-TS domains: use type-driven.

.devin/skills/typescript-best-practices/SKILL.md

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# TypeScript best practices

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A proactive shaping pass on TypeScript source: narrow types, discriminated unions, readonly fields, exhaustive variants, typed trust boundaries, module resolution, TypeScript 7 strict flags. Not a concrete error report (routes to typescript-type-hardening) and not language-agnostic domain modeling (routes to type-driven). |
| Authority | Reversible local: writes only named TypeScript source files and the named `tsconfig.json`; rollback is version control. No remote mutation. No invented strict flags, no universal branded-type or `as` bans, no unvalidated external shapes. |
| Side effect | Shapes TypeScript source and tsconfig. |
| Done | `tsc --noEmit` passes with no `any`, `!`, or double-assertion introduced: illegal states unrepresentable, variants exhaustive, boundaries validated. |

## Inputs

The in-scope TypeScript source files and the target `tsconfig.json`. Scope must name a proactive shaping pass, not a concrete error report (which routes to typescript-type-hardening) nor language-agnostic domain modeling (which routes to type-driven).