Explain common built-in utility types.
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What are utility types like Partial, Pick, and Omit?
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utility-types
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Built-in generic helpers transform types: Partial<T> makes all props optional, Required<T> the reverse, Pick<T,K> selects keys, Omit<T,K> removes keys, Record<K,V> builds a map type, and Readonly<T> makes props immutable. They reduce repetitive type definitions.
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