/**
 * Spec where each key maps to a function that will be called with the input.
 */
export type ApplySpecSpec<T, R> = {
    [K in keyof R]: (input: T) => R[K];
};
/**
 * Create a function that applies a spec of functions to an input,
 * returning an object with the results.
 *
 * @param spec - Object where values are functions to apply
 * @returns Function that applies all spec functions to its input
 *
 * @example
 * const getStats = applySpecFast({
 *   min: (arr: number[]) => Math.min(...arr),
 *   max: (arr: number[]) => Math.max(...arr),
 *   sum: (arr: number[]) => arr.reduce((a, b) => a + b, 0),
 * });
 * getStats([1, 2, 3, 4, 5]); // { min: 1, max: 5, sum: 15 }
 *
 * @example
 * const parseUser = applySpecFast({
 *   name: (u: RawUser) => u.firstName + ' ' + u.lastName,
 *   age: (u: RawUser) => new Date().getFullYear() - u.birthYear,
 * });
 */
export declare function applySpecFast<T, R extends object>(spec: ApplySpecSpec<T, R>): (input: T) => R;
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