import { Option } from '@fable-org/fable-library-js/Option.js';
/**
 * If function returns `true` then return `Some x` otherwise `None`
 */
export declare function where<$a>(f: ((arg0: $a) => boolean), x: $a): Option<$a>;
/**
 * If function return `true` then return `None` otherwise `Some x`
 */
export declare function whereNot<$a>(f: ((arg0: $a) => boolean), x: $a): Option<$a>;
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