# cartDiscountCodesUpdateDefault
Creates a function that accepts an array of strings and adds the discount codes to a cart
### example

```js
import {cartDiscountCodesUpdateDefault} from '@shopify/hydrogen';

const cartDiscount = cartDiscountCodesUpdateDefault({
  storefront,
  getCartId,
});

const result = await cartDiscount(['FREE_SHIPPING']);

```


## cartDiscountCodesUpdateDefault

### CartDiscountCodesUpdateDefaultGeneratedType

#### Returns: CartDiscountCodesUpdateFunction

#### Params:
- options: CartQueryOptions
export function cartDiscountCodesUpdateDefault(
  options: CartQueryOptions,
): CartDiscountCodesUpdateFunction {
  return async (discountCodes, optionalParams) => {
    // Ensure the discount codes are unique
    const uniqueCodes = discountCodes.filter((value, index, array) => {
      return array.indexOf(value) === index;
    });

    const {cartDiscountCodesUpdate, errors} = await options.storefront.mutate<{
      cartDiscountCodesUpdate: CartQueryData;
      errors: StorefrontApiErrors;
    }>(CART_DISCOUNT_CODE_UPDATE_MUTATION(options.cartFragment), {
      variables: {
        cartId: options.getCartId(),
        discountCodes: uniqueCodes,
        ...optionalParams,
      },
    });
    return formatAPIResult(cartDiscountCodesUpdate, errors);
  };
}
### CartQueryOptions

### storefront
The storefront client instance created by [`createStorefrontClient`](docs/api/hydrogen/latest/utilities/createstorefrontclient).
### getCartId
A function that returns the cart ID.
### cartFragment
The cart fragment to override the one used in this query.
### Storefront
Interface to interact with the Storefront API.
### query

### mutate

### cache

### CacheNone

### CacheLong

### CacheShort

### CacheCustom

### generateCacheControlHeader

### getPublicTokenHeaders

### getPrivateTokenHeaders

### getShopifyDomain

### getApiUrl

### isApiError

### i18n

### StorefrontQueries
Maps all the queries found in the project to variables and return types.
export interface StorefrontQueries {
  // Example of how a generated query type looks like:
  // '#graphql query q1 {...}': {return: Q1Query; variables: Q1QueryVariables};
}
### AutoAddedVariableNames

'country' | 'language'
### StorefrontCommonExtraParams

### headers

### storefrontApiVersion

### displayName

### StorefrontQueryOptions

StorefrontCommonExtraParams & {
  query: string;
  mutation?: never;
  cache?: CachingStrategy;
}
### CachingStrategy
Use the `CachingStrategy` to define a custom caching mechanism for your data. Or use one of the pre-defined caching strategies: CacheNone, CacheShort, CacheLong.
### mode
The caching mode, generally `public`, `private`, or `no-store`.
### maxAge
The maximum amount of time in seconds that a resource will be considered fresh. See `max-age` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#:~:text=Response%20Directives-,max%2Dage,-The%20max%2Dage).
### staleWhileRevalidate
Indicate that the cache should serve the stale response in the background while revalidating the cache. See `stale-while-revalidate` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#stale-while-revalidate).
### sMaxAge
Similar to `maxAge` but specific to shared caches. See `s-maxage` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#s-maxage).
### staleIfError
Indicate that the cache should serve the stale response if an error occurs while revalidating the cache. See `stale-if-error` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#stale-if-error).
### StorefrontError

### errors

### StorefrontApiErrors

JsonGraphQLError[] | undefined
### StorefrontMutations
Maps all the mutations found in the project to variables and return types.
export interface StorefrontMutations {
  // Example of how a generated mutation type looks like:
  // '#graphql mutation m1 {...}': {return: M1Mutation; variables: M1MutationVariables};
}
### NoStoreStrategy

### mode

### AllCacheOptions
Override options for a cache strategy.
### mode
The caching mode, generally `public`, `private`, or `no-store`.
### maxAge
The maximum amount of time in seconds that a resource will be considered fresh. See `max-age` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#:~:text=Response%20Directives-,max%2Dage,-The%20max%2Dage).
### staleWhileRevalidate
Indicate that the cache should serve the stale response in the background while revalidating the cache. See `stale-while-revalidate` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#stale-while-revalidate).
### sMaxAge
Similar to `maxAge` but specific to shared caches. See `s-maxage` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#s-maxage).
### staleIfError
Indicate that the cache should serve the stale response if an error occurs while revalidating the cache. See `stale-if-error` in the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#stale-if-error).
### CartDiscountCodesUpdateFunction

#### Returns: Promise<CartQueryDataReturn>

#### Params:
- discountCodes: string[]
- optionalParams: CartOptionalInput
export type CartDiscountCodesUpdateFunction = (
  discountCodes: string[],
  optionalParams?: CartOptionalInput,
) => Promise<CartQueryDataReturn>;
### CartOptionalInput

### cartId
The cart id.
### country
The country code.
### language
The language code.
### CartQueryDataReturn

CartQueryData & {
  errors?: StorefrontApiErrors;
}
### CartQueryData

### cart

### userErrors

### Cart

Cart
### CartUserError

CartUserError
### MetafieldsSetUserError

MetafieldsSetUserError
### MetafieldDeleteUserError

MetafieldDeleteUserError