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| 1 | /**
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| 2 | * @hidden
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| 3 | */
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| 4 | export declare type _OptionalKeys<O extends object> = {
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| 5 | [K in keyof O]-?: {} extends Pick<O, K> ? K : never;
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| 6 | }[keyof O];
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| 7 | /**
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| 8 | * Get the keys of `O` that are optional
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| 9 | * @param O
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| 10 | * @returns [[Key]]
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| 11 | * @example
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| 12 | * ```ts
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| 13 | * ```
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| 14 | */
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| 15 | export declare type OptionalKeys<O extends object> = O extends unknown ? _OptionalKeys<O> : never;
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