I encountered an issue where TypeScript's generics function was unable to locate a property within an interface

I am attempting to define a function in typescript using generics, but I encountered the following error:

"Property 'id' does not exist on type 'CustomerInterface'" This occurs at: customer.id === +id

        getCustomer<CustomerInterface>(id: number | string){
            return this.getCustomers<CustomerInterface>('')
                .then(customers => customers.find(customer => customer.id === +id));
        }

The interface is outlined as follows:

export interface CustomerInterface {
    id: number
    name: string
    display_name: string
    address: string
    city: string
    phone_number: string
}

Answer №1

After some time, I finally cracked the code by implementing Generics constraints =P Here's how it should look:

fetchUser<T extends UserInterface>(id: number | string){
    return this.getUsersNearby<T>('')
        .then(users => users.find(user => user.id === +id));
}

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