lang-typescript

TypeScript language patterns and type safety rules — strict mode, no any, discriminated unions. Use when writing TypeScript code, reviewing types, or enforcing type safety.

Install with Tessl CLI

npx tessl i github:ravnhq/ai-toolkit --skill lang-typescript

What are skills?

0.96x

Quality

58%

Does it follow best practices?

Impact

87%

0.96x

Average score across 3 eval scenarios

Optimize this skill with Tessl

npx tessl skill review --optimize ./skills/universal/lang-typescript/SKILL.md

SKILL.md

Review

Evals

Evaluation results

100%

Product Catalog Sync Tool

Type-safe API data processing

Criteria

Without context

With context

No `any` in function signatures

100%

No inline `any` usage

100%

No type assertions on API data

80%

100%

Uses `unknown` for unvalidated data

100%

Zod schema or type guard present

100%

Discriminated union used

100%

No @ts-nocheck

100%

No @ts-ignore

100%

Strict-compatible types

100%

Proper error branch

100%

Interfaces or types defined

100%

Without context: $0.3810 · 1m 29s · 24 turns · 30 in / 5,287 out tokens

With context: $0.6975 · 2m 41s · 29 turns · 3,572 in / 9,575 out tokens

72%

-12%

User Onboarding Notification Service

Async/await and parallel promise handling

Criteria

Without context

With context

No .then() chains

100%

async/await used

100%

Promise.all for parallel ops

100%

Promise.allSettled for fault-tolerant batch

100%

allSettled results inspected

100%

No raw callbacks

100%

try/catch error handling

Sequential vs parallel distinction

100%

No .catch() chains

Failure count reported

100%

Without context: $0.2449 · 1m 1s · 15 turns · 18 in / 2,920 out tokens

With context: $1.2041 · 4m · 46 turns · 49 in / 15,554 out tokens

90%

React Form Utility Library

Named exports and import ordering

Criteria

Without context

With context

No default exports

100%

Named function exports

100%

Named type/interface exports

100%

External imports first

100%

Blank line between import groups

Local/relative imports last

100%

Internal/@-alias imports in middle

100%

Multiple named exports per file

100%

No module.exports

100%

Consistent import names

100%

Without context: $0.3892 · 1m 21s · 24 turns · 30 in / 5,500 out tokens

With context: $0.6725 · 2m 3s · 34 turns · 1,204 in / 8,048 out tokens

Evaluated: 4 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Product Catalog Sync Tool User Onboarding Notification Service React Form Utility Library

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