Patterns

26 articles · Page 1 of 3

Diagram showing a parent element being styled based on the state of its child using the CSS :has() selector

The CSS :has() Selector: A Practical Guide

How the :has() pseudo-class finally gives CSS a parent selector, and the patterns, pitfalls and performance trade-offs that come with it.

Oct 7, 2026·4 min read

Code editor showing TypeScript unknown type narrowing with type guards

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.

Sep 9, 2026·4 min read

TypeScript code showing template literal types deriving event name unions from domain types

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.

Aug 8, 2026·4 min read

PostgreSQL schema diagram illustrating soft delete complexity and partial index patterns

Backend

Soft Deletes: The Feature That Costs More Than It Saves

Soft deletes look like a simple safety net, but they silently corrupt your schema, poison your queries, and break your constraints — here's what to use instead.

Aug 1, 2026·5 min read

TypeScript code demonstrating the satisfies operator preserving literal types in a config object

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.

Jun 20, 2026·4 min read

TypeScript code showing a strongly-typed event emitter interface with generic constraints and inferred payload types

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.

Jun 13, 2026·4 min read

TypeScript code showing a DataLoader class batching database queries to eliminate N+1 fetch patterns

Backend

The DataLoader Pattern: Killing N+1 Queries Without an ORM

N+1 is not an ORM problem — implement the DataLoader batching pattern in TypeScript to collapse redundant fetches across any source, microservices included.

May 23, 2026·4 min read

TypeScript code demonstrating branded type declarations for UserId, OrderId, and Cents domain types

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.

May 2, 2026·5 min read

TypeScript code showing a composable middleware pipeline with typed context objects

Backend

Composable Middleware Pipelines in TypeScript

Stop bolting middleware onto frameworks and start building type-safe, composable pipeline primitives you can test in isolation and reason about at a glance.

Apr 12, 2026·4 min read

TypeScript code with Zod schema definitions validating API response boundaries

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.

Apr 11, 2026·4 min read

Next.js Server Actions code handling form mutations with TypeScript types

Frontend

React Server Actions: Patterns, Pitfalls, and Production Use

Server Actions bring form handling and mutations back to the server in Next.js — how to use them well, what to avoid and which patterns actually scale.

Apr 1, 2026·4 min read

TypeScript code showing structured error handling with Result types and discriminated unions

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.

Mar 28, 2026·3 min read

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