/**
 * Guard for whether the given value is an object with an optional property
 * with the given name.
 * This variant does not check the value, only that the property exists.
 */
export declare function hasOptional<Name extends string>(obj: unknown, name: Name): obj is {
    [K in Name]?: unknown;
};
/**
 * Guard for whether the given value is an object with an optional property
 * with the given name.
 * This variant checks the value against the given predicate.
 */
export declare function hasOptional<Name extends string, T>(obj: unknown, name: Name, predicate: (value: unknown) => value is T): obj is {
    [K in Name]?: T;
};
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