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);
    });
};