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The foundational guide to mastering TypeScript. Learn how the type inference engine works, master type narrowing with typeof, instanceof, in, and custom type predicates (is), build type-safe discriminated unions, and use as const assertions.

The ultimate TypeScript masterclass roadmap. Master primitive types, type narrowing, generics, mapped types, conditional types, infer keyword, template literal types, type-level state machines, and functional Effect-TS architecture.