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What are indexed access types?

Q: What are indexed access types?

**Indexed access types** look up a property type by key: `Person['name']` gives the type of `name`. With `keyof` and unions you can get a union of value types (`Person[keyof Person]`) — central to generic, type-safe accessors.

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Indexed access types look up a property type by key: Person['name'] gives the type of name. With keyof and unions you can get a union of value types (Person[keyof Person]) — central to generic, type-safe accessors.

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