@graphql-mesh/serve-runtime/esm/createServeRuntime.js

import { createYoga } from 'graphql-yoga';
import { convertSupergraphToFusiongraph } from '@graphql-mesh/fusion-federation';
import { useFusiongraph } from '@graphql-mesh/fusion-runtime';
// eslint-disable-next-line import/no-extraneous-dependencies
import { DefaultLogger, getHeadersObj, wrapFetchWithHooks } from '@graphql-mesh/utils';
import { buildHTTPExecutor } from '@graphql-tools/executor-http';
import { useExecutor } from '@graphql-tools/executor-yoga';
import { isPromise } from '@graphql-tools/utils';
import { handleUnifiedGraphConfig } from './handleUnifiedGraphConfig.js';
export function createServeRuntime(config) {
    let fetchAPI = config.fetchAPI;
    // eslint-disable-next-line prefer-const
    let logger;
    let wrappedFetchFn;
    const configContext = {
        get fetch() {
            return wrappedFetchFn;
        },
        get logger() {
            return logger;
        },
        cwd: globalThis.process?.cwd(),
        cache: 'cache' in config ? config.cache : undefined,
        pubsub: 'pubsub' in config ? config.pubsub : undefined,
    };
    let supergraphYogaPlugin;
    if ('fusiongraph' in config) {
        supergraphYogaPlugin = useFusiongraph({
            getFusiongraph: () => handleUnifiedGraphConfig(config.fusiongraph, configContext),
            transports: config.transports,
            polling: config.polling,
            additionalResolvers: config.additionalResolvers,
            transportBaseContext: configContext,
        });
    }
    else if ('supergraph' in config) {
        supergraphYogaPlugin = useFusiongraph({
            getFusiongraph() {
                const supergraph$ = handleUnifiedGraphConfig(config.supergraph, configContext);
                configContext.logger?.info?.(`Converting Federation Supergraph to Fusiongraph`);
                if (isPromise(supergraph$)) {
                    return supergraph$.then(supergraph => convertSupergraphToFusiongraph(supergraph));
                }
                return convertSupergraphToFusiongraph(supergraph$);
            },
            transports: config.transports,
            polling: config.polling,
            additionalResolvers: config.additionalResolvers,
            transportBaseContext: configContext,
        });
    }
    else if ('proxy' in config) {
        const executor = buildHTTPExecutor({
            fetch: fetchAPI?.fetch,
            ...config.proxy,
        });
        supergraphYogaPlugin = useExecutor(executor);
    }
    const defaultFetchPlugin = {
        onFetch({ setFetchFn }) {
            setFetchFn(fetchAPI.fetch);
        },
        onYogaInit({ yoga }) {
            const onFetchHooks = [];
            for (const plugin of yoga.getEnveloped._plugins) {
                if (plugin.onFetch) {
                    onFetchHooks.push(plugin.onFetch);
                }
            }
            wrappedFetchFn = wrapFetchWithHooks(onFetchHooks);
        },
    };
    const yoga = createYoga({
        fetchAPI: config.fetchAPI,
        logging: config.logging == null ? new DefaultLogger() : config.logging,
        plugins: [defaultFetchPlugin, supergraphYogaPlugin, ...(config.plugins?.(configContext) || [])],
        context: ({ request, req, connectionParams }) => ({
            ...configContext,
            headers: 
            // Maybe Node-like environment
            req?.headers
                ? getHeadersObj(req.headers)
                : // Fetch environment
                    request?.headers
                        ? getHeadersObj(request.headers)
                        : // Unknown environment
                            {},
            connectionParams,
        }),
        cors: config.cors,
        graphiql: config.graphiql,
        batching: config.batching,
        graphqlEndpoint: config.graphqlEndpoint,
        maskedErrors: config.maskedErrors,
    });
    fetchAPI ||= yoga.fetchAPI;
    logger = yoga.logger;
    Object.defineProperty(yoga, 'invalidateUnifiedGraph', {
        value: supergraphYogaPlugin.invalidateUnifiedGraph,
        configurable: true,
    });
    return yoga;
}