export declare function getMinMaxValue<T, K extends keyof T>(arr: T[], key: K): [number, number];
/**
 * A map function that takes an array, and a mapper function
 * and returns only Truthy values in the resulting array
 *
 * Note: the resulting array will never be LARGER than the input array
 * but it can be SMALLER than the input array, if there are a few Falsy mapped values
 */
export declare function truthyMap<T, K>(arr: T[], mapperFn: (item: T) => K): K[];
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