/**
 * Shared helpers for education commands.
 *
 * EducationHub facts (verified contracts origin/main src/EducationHub.sol):
 *   - getModule(id) returns (uint256 payout, bool exists) and REVERTS
 *     ModuleUnknown for unknown ids — so a failed eth_call means "does not
 *     exist", not an RPC problem, in checkModuleExists.
 *   - hasCompleted(learner, id) is the per-account completion bitmap;
 *     completeModule reverts AlreadyCompleted on a second attempt.
 *   - Module metadata (title bytes + contentHash) is EVENT-ONLY — the chain
 *     stores just {answerHash, payout, exists}, so current title/metadata
 *     must come from the subgraph/IPFS.
 */
import { ethers } from 'ethers';
import type { PreflightCheck } from '../../lib/preflight';
export declare const EDU_READ_IFACE: ethers.utils.Interface;
/**
 * Module exists on-chain. getModule reverts ModuleUnknown for unknown ids,
 * so an unsuccessful call IS the "not found" signal.
 */
export declare function checkModuleExists(educationHubAddr: string, moduleId: ethers.BigNumberish): PreflightCheck;
/**
 * Learner has NOT already completed the module (completeModule reverts
 * AlreadyCompleted otherwise — each module pays out once per account).
 */
export declare function checkNotCompleted(educationHubAddr: string, learner: string, moduleId: ethers.BigNumberish): PreflightCheck;