SonarQube alerting you to "Eliminate this unnecessary casting"

Can someone help me understand why SonarQube is flagging this error and suggest a resolution?

The unnecessary cast should be removed.

Promise.all([
  this.customerViewCmr4tProvider.getData(activeNumber),
  this.customerBillManagementProvider.getData(individualPublicId, billingAccountId, false),
  this.agreementProvider.getData(this.activeCustomerServiceProvider.getPhoneNumber(), this.activeCustomerServiceProvider.getCmsProfile()
  )]
)
  .then(
    (results) => {
      let customerViewRootCrm4tModel = new CustomerViewRootCrm4tModel();
      let customerBillModel = new CustomerBillRootModel();
      let agreementRoot = new AgreementRoot();

      if (results[0] instanceof CustomerViewRootCrm4tModel) {
        customerViewRootCrm4tModel = results[0] as CustomerViewRootCrm4tModel;
      }

      if (results[1] instanceof CustomerBillRootModel) {
        customerBillModel = results[1] as CustomerBillRootModel;
      }

      if (results[2] instanceof AgreementRoot) {
        agreementRoot = results[2] as AgreementRoot;
      }

      const numberDevices = this.customerViewCmr4tProvider.getProductByActiveNumber(customerViewRootCrm4tModel, activeNumber).length;
      const lastBill = this.customerBillManagementProvider.getLastCustomerBill(customerBillModel).amountDue.value;
      const agreement = this.getAgreementMonthsLeft(agreementRoot);
      this.sendGoogleAnalyticsPageView(numberDevices.toString(), agreement, lastBill);
    },
    () => {
      // error
      this.sendGoogleAnalyticsPageView("", "", null);
    }
  );

https://i.stack.imgur.com/E0mGX.png

Answer №1

If you encounter a similar error in any programming language like Java, C#, or others, it typically means that the variable you are trying to cast is already of the type you are attempting to cast it to. In simple terms, they are suggesting that you remove the unnecessary cast. Instead of:

customerViewRootCrm4tModel = results[0] as CustomerViewRootCrm4tModel;

You should simply assign it like this:

customerViewRootCrm4tModel = results[0];

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