NestJS util in order to obtain "side-effects"

sideEffects.ts

/**
 * Little helper for creating "side effects" with TypeScript
 * @param effect {Promise<T> | Function} Function or promise to call independently
 * @param caller {string} Name of side effect, useful for logging
 */

export function sideEffect(effect: Promise<any> | Function, caller: string): void {
    if (effect instanceof Promise) {
        effect
            .then(() => console.log(`Side effect "${caller}" completed without errors.`))
            .catch((e) => console.log(`Side effect "${caller}" completed with errors: ${e.message || JSON.stringify(e)}`));
        return;
    }
    if (effect instanceof Function) {
        try {
            effect();
            console.log(`Side effect "${caller}" completed without errors.`)
        } catch (e) {
            console.log(`Side effect "${caller}" completed with errors: ${e.message || JSON.stringify(e)}`)
        }
        return;
    }
    console.log(`Side effect "${caller}" completed with errors: (given arg) is not a promise neither a function!`);
}


   
// Example usage:
// In this case {status: true} will be returned exactly after await markUserCartAsCompleted and deleteCustomerPaymentMethod will be executed "in background" 
   
await this.guestcartDatabase.markUserCartAsCompleted(req.guestCartId);
if (req.nativePaymentToken) {
    sideEffect(this.stripeService.deleteCustomerPaymentMethod(firebaseToken, stripe_token.split(':')[0]), "ORDER_DELETE_CUSTOMER_PM");
}

return { status: true };