The use of a variable occurs prior to it being assigned through the fetch operation

While working on my function, I encountered an error message in Typescript specifically pointing to the second last line:

The error stated that 'organizationInfoResponse' is being used before it is assigned.

I'm unsure about how to address this issue since I am assigning 'organizationInfoResponse' within a try-catch block while making a fetch call. Can you provide some guidance on resolving this situation?

interface OrganizationInfoResponse {
  organization_name: string;
  organization_id: string;
  errorCode?: string;
}

export const handleGetOrganization = async (
  organizationName: string,
): Promise<OrganizationInfoResponse> => {
  let organizationInfoResponse: OrganizationInfoResponse;

  try {
    const rawRes = await fetch(
      `/sometestendpoint/${organizationName}`,
      {
        method: 'GET',
        headers: {
          'Content-Type': 'application/json',
        },
      },
    );

    organizationInfoResponse = await rawRes.json();

    if (rawRes.status >= 400) {
      if (organizationInfoResponse.errorCode === ErrorCodes.INVALID_ORG_NAME) {
        throw new Error('Given Organization Name is invalid');
      }
    }
  } catch (error) {
    // Do something
  }

  return organizationInfoResponse;
};

Answer №1

In your comment, you explained that the issue lies in assigning a value to the organizationInfoResponse variable within a try-catch block and then attempting to return it outside of this block. If an error is caught within the try-catch, the variable will remain unassigned and cannot be returned. To resolve this, make sure to provide a default value for the variable when declaring it.

Answer №2

In the event that you do not provide a valid OrganizationResponseInfo and refrain from throwing an error, it becomes necessary to alter the return type to be nullable. This means changing it to

Promise<OrganizationResponseInfo?>
.

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