The Command Pattern with Discriminated Unions: A 90-Line Undo/Redo
Book: The TypeScript Type System — From Generics to DSL-Level Types Also by me: The TypeScript Library — the 5-book collection My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub You open a drawing app. Draw
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