Ethereum Web3 helper functions

eth-helpers.js

function $waitForOneBlock(){
  const id = Date.now();

  return new Promise((resolve, reject) => {
    web3Instance.currentProvider.send({
      jsonrpc: "2.0",
      method: "evm_mine",
      params: [], "id": id,
    }, function(e,r){
      if(e) reject(e);
      resolve(r);
    });
  });
};