import type { INTERNAL_Snapshot } from '../vanilla';
/**
 * proxyWithComputed
 *
 * This is to create a proxy with initial object and additional object,
 * which specifies getters for computed values with dependency tracking.
 * It also accepts optional setters for computed values.
 *
 * [Notes]
 * This comes with a cost and overlaps with useSnapshot.
 * Do not try to optimize too early. It can worsen the performance.
 * Measurement and comparison will be very important.
 *
 * @example
 * import { proxyWithComputed } from 'valtio/utils'
 * const state = proxyWithComputed({
 *   count: 1,
 * }, {
 *   doubled: snap => snap.count * 2, // getter only
 *   tripled: {
 *     get: snap => snap.count * 3,
 *     set: (state, newValue) => { state.count = newValue / 3 }
 *   }, // with optional setter
 * })
 */
export declare function proxyWithComputed<T extends object, U extends object>(initialObject: T, computedFns: {
    [K in keyof U]: ((snap: INTERNAL_Snapshot<T>) => U[K]) | {
        get: (snap: INTERNAL_Snapshot<T>) => U[K];
        set?: (state: T, newValue: U[K]) => void;
    };
}): T & U;