New to ts

[hardy blade]

How do I fix this error? migrating from js.

const URL = process.env.mongourl;
const mongoClient = new MongoClient(URL, { useNewUrlParser: true, useUnifiedTopology: true });

Argument of type 'string | undefined' is not assignable to parameter of type 'string'.
Type 'undefined' is not assignable to type 'string'.

[loud shadow]

const URL = process.env.mongourl!;

if you're sure the environment variable is always there

[hardy blade]

it sometimes won't be there if the env file is not there, what do I do?

[loud shadow]

then the typescript error is correct

what should the app do when the env var is not there?

[hardy blade]

throw an error maybe?

war/inform the user somwhow

[loud shadow]

yeah if you make it throw an error

that should make typescript happy

[hardy blade]

hmm ok

wait the error went away itself? hmm?

[loud shadow]

?!

how?!

[hardy blade]

I had changed the js requires to imports

(I am migrating to ts from js)

[loud shadow]

thonk

[hardy blade]

soo er do I need to handle the case where it might be undefined or leave it?

[loud shadow]

you probably should

[hardy blade]

ok ty

something like this good?

if (URL) {
    const mongoClient = new MongoClient(URL, { useNewUrlParser: true, useUnifiedTopology: true });
} else {
    throw new Error("Env file not configured properly. 'mongourl' not defined.")
}

[loud shadow]

not really

you can't access mongoclient outside the if that way

just do if (!URL) { throw the error }

[hardy blade]

ah yea sorry