Cannot assign argument of type 'string | undefined' to parameter expecting type 'string'. Typescript is being strict

While attempting to update an object using the SDK and having 'strict' mode enabled in typescript, I encountered the following error:

const offer = client.offer(oldOfferDefinition!.id);
await offer.replace(newOfferDefinition);

error TS2345: Argument of type 'string | undefined' is not assignable to parameter of type 'string'. Type 'undefined' is not assignable to type 'string'.

const offer = client.offer(oldOfferDefinition!.id);

I am confident that oldOfferDefinition contains an id with a value. How can I solve this compilation error?

javascripttypescript

Answer №1

To ensure that the value is present, throw an exception if it is not.

const identifier = previousOffer!.id;
if (typeof identifier === "undefined") {
    throw new Error("Identifier for previous offer is not defined");
}
const currentOffer = client.offer(identifier);

If the value remains undefined, the TS compiler will approve since the runtime cannot access the line where it is passed to client.offer.

Answer №2

Revise oldOfferDefinition by removing the exclamation mark and enclose it within a condition block

if(oldOfferDefinition){
    const offer: string = client.offer(oldOfferDefinition.id);
    await offer.replace(newOfferDefinition);
}

Ensure that the return type of the offer() function is strictly defined as a string

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