class ApolloClient

Constructs an instance of ApolloClient.

This watches the cache store of the query according to the options specified and returns an ObservableQuery. We can subscribe to this ObservableQuery and receive updated results through an observer when the cache store changes.

Note that this method is not an implementation of GraphQL subscriptions. Rather, it uses Apollo's store in order to reactively deliver updates to your query results.

For example, suppose you call watchQuery on a GraphQL query that fetches a person's first and last name and this person has a particular object identifier, provided by dataIdFromObject. Later, a different query fetches that same person's first and last name and the first name has now changed. Then, any observers associated with the results of the first query will be updated with a new result object.

Note that if the cache does not change, the subscriber will not be notified.

See here for a description of store reactivity.

This resolves a single query according to the options specified and returns a Promise which is either resolved with the resulting data or rejected with an error.

This resolves a single mutation according to the options specified and returns a Promise which is either resolved with the resulting data or rejected with an error. In some cases both data and errors might be undefined, for example when errorPolicy is set to 'ignore'.

It takes options as an object with the following keys and values:

This subscribes to a graphql subscription according to the options specified and returns an Observable which either emits received data or an error.

Tries to read some data from the store in the shape of the provided GraphQL query without making a network request. This method will start at the root query. To start at a specific id returned by dataIdFromObject use readFragment.

Tries to read some data from the store in the shape of the provided GraphQL fragment without making a network request. This method will read a GraphQL fragment from any arbitrary id that is currently cached, unlike readQuery which will only read from the root query.

You must pass in a GraphQL document with a single fragment or a document with multiple fragments that represent what you are reading. If you pass in a document with multiple fragments then you must also specify a fragmentName.

Writes some data in the shape of the provided GraphQL query directly to the store. This method will start at the root query. To start at a specific id returned by dataIdFromObject then use writeFragment.

Writes some data in the shape of the provided GraphQL fragment directly to the store. This method will write to a GraphQL fragment from any arbitrary id that is currently cached, unlike writeQuery which will only write from the root query.

You must pass in a GraphQL document with a single fragment or a document with multiple fragments that represent what you are writing. If you pass in a document with multiple fragments then you must also specify a fragmentName.

Resets your entire store by clearing out your cache and then re-executing all of your active queries. This makes it so that you may guarantee that there is no data left in your store from a time before you called this method.

resetStore() is useful when your user just logged out. You’ve removed the user session, and you now want to make sure that any references to data you might have fetched while the user session was active is gone.

It is important to remember that resetStore() will refetch any active queries. This means that any components that might be mounted will execute their queries again using your network interface. If you do not want to re-execute any queries then you should make sure to stop watching any active queries.

Allows callbacks to be registered that are executed when the store is reset. onResetStore returns an unsubscribe function that can be used to remove registered callbacks.

Remove all data from the store. Unlike resetStore, clearStore will not refetch any active queries.

Allows callbacks to be registered that are executed when the store is cleared. onClearStore returns an unsubscribe function that can be used to remove registered callbacks.

Call this method to terminate any active client processes, making it safe to dispose of this ApolloClient instance.

Refetches all of your active queries.

reFetchObservableQueries() is useful if you want to bring the client back to proper state in case of a network outage

It is important to remember that reFetchObservableQueries() will refetch any active queries. This means that any components that might be mounted will execute their queries again using your network interface. If you do not want to re-execute any queries then you should make sure to stop watching any active queries. Takes optional parameter includeStandby which will include queries in standby-mode when refetching.

Update the variables of this observable query, and fetch the new results. This method should be preferred over setVariables in most use cases.

Update the variables of this observable query, and fetch the new results if they've changed. Most users should prefer refetch instead of setVariables in order to to be properly notified of results even when they come from the cache.

Note: the next callback will not fire if the variables have not changed or if the result is coming from cache.

Note: the promise will return the old results immediately if the variables have not changed.

Note: the promise will return null immediately if the query is not active (there are no subscribers).

A function that helps you fetch the next set of results for a paginated list field.

A function that enables you to update the query's cached result without executing a followup GraphQL operation.

See using updateQuery and updateFragment for additional information.

A function that instructs the query to begin re-executing at a specified interval (in milliseconds).

A function that instructs the query to stop polling after a previous call to startPolling.

A function that enables you to execute a subscription, usually to subscribe to specific fields that were included in the query.

This function returns another function that you can call to terminate the subscription.

The current status of a query’s execution in our system.