Typescript: Select just one option from the union

There is a specific Query type that contains the getBankAccounts property:

export type Query = {
  getBankAccounts: GetBankAccountsResponseOrUserInputRequest,
};

This property can return either a GetAccountsResponse or a UserInputRequest:

export type GetBankAccountsResponseOrUserInputRequest = GetAccountsResponse | UserInputRequest;

I am trying to extract only the response type of GetAccountsResponse using 

Pick<Query, "getBankAccounts">
.

Your assistance on this matter would be greatly appreciated.

typescript

Answer №1

const BankAccountQuery = Pick<Query, Exclude<keyof Query, 'getBankAccounts'>> & { getBankAccounts: GetAccountsResponse }

To achieve the same result, you can also utilize an Overwrite helper:

type Overwrite<T, U extends { [K in keyof T]?: any }> = U & Pick<T, Exclude<keyof T, keyof U>>;
type BankAccountQuery = Overwrite<Query, {getBankAccounts: GetAccountsResponse }>;

Please note that this approach will select any additional field from the Query type if present. If you only wish to select exactly one field, it might be simpler to declare another separate type?

type BankAccountQuery = {
  getBankAccounts: GetAccountsResponse;
}

Typescript Playground

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