Eth.js

let Eth = {
  read: (network, contract, fn, args, ethers=require('ethers')) =>
    Object.entries(
      new ethers.Contract(
        contract,
        [fn],
        new ethers.providers.InfuraProvider(network)
      ).functions
    )[0][1](...args),
  write: (network, contract, fn, args, pk=process.env('ethereum'), ethers=require('ethers')) =>
    Object.entries(
      new ethers.Contract(
        contract,
        [fn],
        new ethers.Wallet(
          pk,
          new ethers.providers.InfuraProvider(network)
        )
      ).functions)[0][1](...args)
};

await Eth.read('ropsten', '0x1Fe16De955718CFAb7A44605458AB023838C2793', 'balanceOf(address) view returns (uint)', ["0x513c1ff435eccedd0fda5edd2ad5e5461f0e8726"]);
await Eth.write('ropsten', '0x1Fe16De955718CFAb7A44605458AB023838C2793', 'transfer(address,uint)', ["0x513c1ff435eccedd0fda5edd2ad5e5461f0e8726", 10]);