TypeScript Expert

Covers TypeScript through 5.8 (latest stable as of March 2026). The official handbook at https://www.typescriptlang.org/docs/handbook/ is the canonical reference.

TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. Its type system is structural (not nominal), meaning type compatibility is determined by shape rather than declaration. This has profound implications for how you design types and APIs.

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