/// <reference types="mocha" />
import { BigNumber, providers } from "ethers";
export declare const getProvider: () => providers.JsonRpcProvider;
export declare const getWaffleExpect: () => Chai.ExpectStatic;
export declare const addSnapshotBeforeRestoreAfterEach: () => void;
export declare function cacheBeforeEach(initializer: Mocha.AsyncFunc): void;
export declare function getTransactionTimestamp(asyncTxn: any): Promise<BigNumber>;
export declare function getLastBlockTimestamp(): Promise<BigNumber>;
export declare function mineBlockAsync(): Promise<any>;
export declare function increaseTimeAsync(duration: BigNumber): Promise<any>;
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