Type key value as variant number typescript

Question

I have a problem to type an abi key "5777" in typescript. When i get a netwotkId and then set in networks key, the linter show me the next error

i need to type "networkId" and that it is not a always a fixed value as like "5777"

let networkId = await web3.eth.net.getId();

// type network = "5777";

let networkId = await web3.eth.net.getId();

DeluxerContract = new web3.eth.Contract(
      artifact.abi,
      artifact.networks[networkId].address
);

This is not a viable solution because the networkId is variable.

    type network = "5777";

    let networkId: network = await web3.eth.net.getId();

    DeluxerContract = new web3.eth.Contract(
      artifact.abi,
      artifact.networks[networkId].address
    );

Answer 1

Try this: artifact.networks[networkId as network].address

Answer 2

I think that is because web3.eth.net.getId() return value might be undefined (add logic based on return value) . You should add a guard

let networkId=await web3.eth.net.getId()
// continue if networkId exists
if (networkId){
  DeluxerContract = new web3.eth.Contract(
      artifact.abi,
      artifact.networks[networkId].address
);
}