Engineering
Stop Reaching for any: Narrowing unknown in TypeScript
Why unknown is the type-safe replacement for any, and the narrowing patterns that make it practical in real code.
·4 min read
Tags
Type Safety
12 articles
Engineering
Template Literal Types: Expressive, Type-Safe APIs
Use TypeScript template literal types to encode event names, route patterns and permission sets in the type system — no runtime checks, no string drift.
·4 min read
Engineering
TypeScript satisfies: Type Safety Without Losing Inference
The satisfies operator validates that a value matches a type while preserving literal inference — why that distinction matters and where to apply it.
·4 min read
Backend
Type-Safe Event Emitters in TypeScript
Replace Node's stringly-typed EventEmitter with a generic typed alternative that catches event name typos and payload mismatches at compile time.
·4 min read
Engineering
TypeScript Branded Types: Compile-Time Domain Modeling
Eliminate a whole class of runtime bugs by teaching TypeScript the difference between a UserId and an OrderId — even when both are strings underneath.
·5 min read
Engineering
Runtime Type Safety with Zod: Validating at Every Boundary
TypeScript's type system stops at compile time — Zod closes the gap by validating data at the runtime boundaries where it actually matters.
·4 min read
Engineering
Error Handling in TypeScript: Patterns That Scale
Move beyond try-catch soup: discriminated unions, Result types, and error boundaries that make TypeScript codebases more reliable and maintainable.
·3 min read
Engineering
TypeScript Patterns for Large Codebases
Advanced TypeScript patterns I use daily: discriminated unions, branded types, the builder pattern and utility types that keep large codebases safe.
·3 min read
Backend
Building Type-Safe GraphQL APIs with Code Generation
A practical guide to end-to-end type safety in GraphQL with schema-first code generation: typed resolvers, client query types and no runtime mismatches.
·3 min read
Tutorials
Building a Full-Stack Type-Safe API with tRPC and Next.js
A complete tutorial on end-to-end type-safe APIs with tRPC and the Next.js App Router: router setup, middleware, input validation and subscriptions.
·5 min read
Tutorials
Building a Type-Safe Form Library from Scratch
Build a type-safe form library in TypeScript with runtime validation, field-level error tracking, dirty state and a composable API that catches errors early.
·5 min read
Tutorials
Building a Type-Safe API Client Generator from OpenAPI Specs
Build a code generator that reads OpenAPI specs and emits fully typed TypeScript API clients with request validation, error handling and type inference.
·5 min read