typescript-pro

Implements advanced TypeScript type systems, creates custom type guards, utility types, and branded types, and configures tRPC for end-to-end type safety. Use when building TypeScript applications requiring advanced generics, conditional or mapped types, discriminated unions, monorepo setup, or full-stack type safety with tRPC.

1.07x

Quality

100%

Does it follow best practices?

Impact

85%

1.07x

Average score across 6 eval scenarios

Securityby

Passed

No known issues

Evaluation results

90%

Domain Modeling Library for a Healthcare Appointment System

Branded types and strict tsconfig

Criteria

Without context

With context

Branded identifier types

100%

No TypeScript enums

100%

Const object with as const

100%

satisfies operator usage

Discriminated union states

100%

Type predicate guards

100%

Strict mode enabled

100%

Declaration files configured

100%

No explicit any

100%

Type-only imports

100%

Strict null checks not disabled

100%

30%

Payment Processing Module with Robust Error Handling

Result pattern and type narrowing

Criteria

Without context

With context

Result type wrapper

100%

Typed error variants

100%

Discriminated union lifecycle

30%

100%

Type predicate validators

100%

Assertion function usage

100%

Exhaustive switch with assertNever

100%

No unsafe as-casts

62%

100%

No explicit any

100%

Result composition utility

100%

Type-only imports

100%

96%

10%

Monorepo TypeScript Configuration for a SaaS Platform

Monorepo project references and build config

Criteria

Without context

With context

Root references array

100%

composite flag on shared

100%

Package-level references

100%

Declaration files on shared

100%

Incremental compilation

50%

Node module resolution for API

100%

Bundler resolution for web

100%

Strict mode in all packages

100%

No enums in shared types

100%

Build documentation

100%

Root files array

100%

44%

Type-Safe Event Bus for a Microservices Platform

Conditional types, mapped types, template literal types

Criteria

Without context

With context

Conditional type payload derivation

80%

100%

infer keyword usage

Template literal event category types

100%

Mapped type for handler/subscription interface

33%

Key remapping with as clause

Modifier removal or addition

No explicit any

100%

as const for event registry

No enums

100%

Type-only imports

100%

TypeScript Utility Types Package for a Shared Infrastructure Library

Custom utility types and type-level programming

Criteria

Without context

With context

DeepReadonly type

100%

DeepPartial type

100%

PickByType or OmitByType utility

100%

RequireAtLeastOne constraint

100%

ValueOf utility

100%

ConditionalKeys utility

100%

Type-level equality test mechanism

100%

Generic default type parameters

100%

Declaration file generation configured

100%

No explicit any

100%

No enums

100%

84%

-5%

TypeScript Type Safety Audit for a Pre-Release SDK

TypeScript workflow verification and type coverage

Criteria

Without context

With context

tsc --noEmit executed

80%

100%

Zero type errors

100%

type-coverage tool used

100%

Explicit return types on all exports

100%

No explicit any in fixed files

100%

Type predicate syntax in validators

100%

noUncheckedIndexedAccess enabled

exactOptionalPropertyTypes enabled

100%

Declaration files configured

100%

Strict mode enabled

100%

Repository: jeffallan/claude-skills
Commit: 5b76101

Evaluated: 27 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Domain Modeling Library for a Healthcare Appointment System Payment Processing Module with Robust Error Handling Monorepo TypeScript Configuration for a SaaS Platform Type-Safe Event Bus for a Microservices Platform TypeScript Utility Types Package for a Shared Infrastructure Library TypeScript Type Safety Audit for a Pre-Release SDK

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