import type { UncertainNumber } from '../UncertainNumber';
import type { Usage } from '../Usage';
/**
 * Minimal usage information required to calculate worktime
 */
type PartialUsage = Pick<Usage, 'input' | 'output'> & {
    input: Pick<Usage['input'], 'wordsCount'>;
    output: Pick<Usage['output'], 'wordsCount'>;
};
/**
 * Function usageToWorktime will take usage and estimate saved worktime in hours of reading / writing
 *
 * Note: This is an estimate based of these sources:
 * - https://jecas.cz/doba-cteni
 * - https://www.originalnitonery.cz/blog/psani-vsemi-deseti-se-muzete-naucit-i-sami-doma
 *
 * @public exported from `@promptbook/core`
 */
export declare function usageToWorktime(usage: PartialUsage): UncertainNumber;
export {};