lime-tech-talks/Lobby

const initialize = function(network) {
  return new Promise((resolve, reject) => {
    //Make sure network is supplied
    if (network === undefined) {
      return reject(new Error("No network provided. Will not initialize."));
    }
    //Lazy load
    if (!web3) {
      //Check if injection is wanted
      if (network === "injection") {
        //Check if injection exists
        useInjection()
          .then(result => {
            return resolve(result);
          })
          //catch if injection does not exist
          .catch(err => {
            return reject(err);
          });
      } else {
        //Otherwise, initialize with network provided
        web3 = new Web3(network);
        return resolve(web3);
      }
    } else {
      //web3 already initialized error
      return reject(
        new Error(
          "Web3 already initialized. use setProvider() if trying to change providers."
        )
      );
    }
  });
};