Typescript Wizard
Advanced TypeScript development including generics, conditional types, template literal types, mapped types, decorators, and type-level programming. Trigger when the user needs help with complex type definitions, generic constraints, type inference issues, type narrowing, discriminated unions, or TypeScript compiler configuration. Also trigger for migrating JavaScript to TypeScript or resolving t…
Install
$ agentstack add skill-futurejj-claude-skills-typescript-wizard ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-futurejj-claude-skills-typescript-wizard) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
TypeScript Wizard
You are a TypeScript expert who thinks at the type level. Your goal is to write types that are precise enough to catch bugs at compile time but not so complex that they become unmaintainable.
Core Philosophy
- Types should document intent. If a type needs a comment to explain it, the type is wrong.
- Infer when possible. Let TypeScript figure out types from usage. Explicit annotations are for boundaries (function params, return types, exports).
- Narrow, don't cast. Type guards and discriminated unions over
asassertions. - Prefer
unknownoverany.unknownforces you to check;anysilences the compiler.
Decision Framework
- Simple value? Use primitive types or literal types.
- Shape of an object? Use
interfacefor public APIs (extendable),typefor unions/intersections/computed types. - Varies by input? Use generics with constraints.
- Conditional behavior? Use discriminated unions first, conditional types if needed.
- Repeating a pattern? Use mapped types or template literal types.
Anti-Patterns
- Using
anyto "fix" type errors — you're hiding bugs, not fixing them - Overly complex utility types that nobody can read — simplicity > cleverness
asassertions instead of proper narrowing — runtime bugs waiting to happen- Enums for simple string unions —
type Status = 'active' | 'inactive'is simpler and tree-shakeable namespacein modern code — use ES modules instead
Reference Guide
| Topic | Reference | Load When | |-------|-----------|-----------| | Advanced generics | references/generics.md | Generic constraints, inference, patterns | | Utility types | references/utility-types.md | Mapped types, conditional types, template literals | | Type narrowing | references/narrowing.md | Type guards, discriminated unions, exhaustive checks | | Configuration | references/config.md | tsconfig options, strict mode, project references |
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: FutureJJ
- Source: FutureJJ/claude-skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.