/**
 * @fileoverview Browser-safe client-side computation of PoUW work units.
 *
 * Accepts an IWorkUnit payload, performs the requested SHA3-512 hash operation
 * (LeafHash or InteriorHash), and returns an IWorkResult with the computed
 * hash, timing metadata, and the original challenge token.
 *
 * Uses `@noble/hashes/sha3` directly for browser compatibility.
 *
 * @see Requirements 7.1, 7.2, 7.3, 7.4, 7.5
 */
import { IWorkResult } from '../interfaces/pouw/workResult';
import { IWorkUnit } from '../interfaces/pouw/workUnit';
/**
 * Callback invoked to report computation progress.
 *
 * @param completed - Number of steps completed so far.
 * @param total     - Total number of steps in this work unit.
 */
export type ProgressCallback = (completed: number, total: number) => void;
/**
 * Compute a single PoUW work unit and return the result.
 *
 * For **LeafHash**: decodes the base64 `inputData`, computes SHA3-512, and
 * returns the 128-character lowercase hex digest.
 *
 * For **InteriorHash**: decodes the base64 `inputData` (concatenated child
 * hashes), computes SHA3-512 over the concatenation, and returns the hex
 * digest.
 *
 * @param workUnit - The work unit to compute.
 * @param onProgress - Optional callback for progress reporting.
 * @returns A promise resolving to the computed IWorkResult.
 *
 * @throws {TranslatableBrightChainError} if the operation type is unsupported
 *   or the input data is not valid base64.
 *
 * @see Requirements 7.1, 7.2, 7.3, 7.4, 7.5
 */
export declare function computeWorkUnit(workUnit: IWorkUnit, onProgress?: ProgressCallback): Promise<IWorkResult>;
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