Node.js Production Engineering 06 — Patterns cho Codebase lớn
Thiết kế ranh giới module, dependency injection, transaction, cache, queue và resilience để codebase Node.js tiếp tục thay đổi an toàn khi sản phẩm và đội ngũ cùng lớn lên.
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#design-patterns
11 entries
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Design Patterns in TypeScript · Part 10 — Proxy & Dependency Injection
Control access and wire your app for testability: the JS Proxy for reactivity/validation/lazy loading, Dependency Injection and Inversion of Control, the composition root, and choosing constructor injection over service-locator.
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Design Patterns in TypeScript · Part 9 — State & State Machines
Make impossible states impossible: the State pattern, modeling UI/lifecycle with a finite state machine, type-safe transitions via discriminated unions, and why this kills "loading && error" bugs.
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Design Patterns in TypeScript · Part 8 — Command & Memento
Turn actions into data: the Command pattern for dispatch, queues, and undo/redo, the Memento for snapshotting state, and how reducers (Redux-style) are commands in disguise.
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Design Patterns in TypeScript · Part 7 — Adapter & Facade
Tame third-party and legacy code: the Adapter that makes an incompatible API fit your interface, the Facade that hides a messy subsystem behind one entry point, and the anti-corruption layer that keeps vendor types out of your domain.
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Design Patterns in TypeScript · Part 6 — Decorator & Middleware
Add behavior without touching the original: the Decorator pattern via higher-order functions, wrapping a service to add caching/logging/retry, the middleware chain, and how TS decorators (and the new standard) compare.
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Design Patterns in TypeScript · Part 5 — Observer & Pub/Sub
Decouple "something changed" from "who reacts": the Observer pattern, a fully typed event emitter, the platform EventTarget, Pub/Sub via an event bus, and how signals/reactivity build on the same idea.
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Design Patterns in TypeScript · Part 4 — Strategy
Swap an algorithm at runtime without touching its caller: the Strategy pattern, why a map of functions is the idiomatic TS form, replacing sprawling if/switch, and injecting behavior for testability.
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Design Patterns in TypeScript · Part 3 — Builder & Fluent APIs
Construct complex objects step by step: fluent method chaining, immutable builders, the type-safe staged (phantom-type) builder that makes illegal states unrepresentable, and when an options object is enough.
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Design Patterns in TypeScript · Part 2 — Factory & Abstract Factory
Centralize object creation: factory functions over `new`, discriminated-union driven factories, the Abstract Factory for families of related objects, and where this beats classes in TypeScript.
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Design Patterns in TypeScript · Part 1 — Singleton & the Module Pattern
When (and when not) to share a single instance: the Singleton pattern, why ESM modules are already singletons, lazy init, the testability trap, and typed implementations — with exercises.