packages/contracts/migrations/4_configure_proxy.ts


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import { Artifacts } from '../util/artifacts';
import { ContractInstance } from '../util/types';
const { TokenTransferProxy, Exchange, TokenRegistry } = new Artifacts(artifacts);

let tokenTransferProxy: ContractInstance;
module.exports = (deployer: any) => {
    deployer
        .then(async () => {
            return Promise.all([TokenTransferProxy.deployed(), TokenRegistry.deployed()]);
        })
        .then((instances: ContractInstance[]) => {
            let tokenRegistry: ContractInstance;
            [tokenTransferProxy, tokenRegistry] = instances;
            return tokenRegistry.getTokenAddressBySymbol('ZRX');
        })
        .then((ptAddress: string) => {
            return deployer.deploy(Exchange, ptAddress, tokenTransferProxy.address);
        })
        .then(() => {
            return tokenTransferProxy.addAuthorizedAddress(Exchange.address);
        });
};