@envelop/execute-subscription-event/esm/index.js

Utilities for hooking into the [ExecuteSubscriptionEvent](<https://spec.graphql.org/draft/#ExecuteSubscriptionEvent()>) phase.

import { execute } from 'graphql';
import { makeExecute } from '@envelop/core';
import { subscribe } from './subscribe.js';
export const useExtendContextValuePerExecuteSubscriptionEvent = (createContext) => {
    return {
        onSubscribe({ args, setSubscribeFn }) {
            const executeNew = makeExecute(async (executionArgs) => {
                const context = await createContext({ args });
                try {
                    return await execute({
                        ...executionArgs,
                        // GraphQL.js 16 changed the type of contextValue to unknown
                        // eslint-disable-next-line @typescript-eslint/ban-ts-comment
                        // @ts-ignore
                        contextValue: { ...executionArgs.contextValue, ...context?.contextPartial },
                    });
                }
                finally {
                    context?.onEnd?.();
                }
            });
            setSubscribeFn(subscribe(executeNew));
        },
    };
};