@graphql-mesh/handler-federation/index.esm.js

import { ApolloGateway } from '@apollo/gateway';
import { print, Kind } from 'graphql';
import { makeRemoteExecutableSchema, delegateToSchema } from 'graphql-tools';
import { fetchache, Request } from 'fetchache';

const handler = {
    async getMeshSource({ config, hooks, cache }) {
        const gateway = new ApolloGateway({
            fetcher: (info, init) => fetchache(typeof info === 'string' ? new Request(info, init) : info, cache),
            ...config,
        });
        const { schema, executor } = await gateway.load();
        const fetcher = ({ query, operationName, variables, context }) => executor({
            document: query,
            request: {
                query: print(query),
                variables,
            },
            operationName,
            cache,
            context,
            queryHash: print(query) + '_' + JSON.stringify(variables),
            logger: console,
            metrics: {},
            source: print(query),
            operation: query.definitions.find(definition => { var _a; return definition.kind === Kind.OPERATION_DEFINITION && ((_a = definition.name) === null || _a === void 0 ? void 0 : _a.value) === operationName; }),
        });
        const remoteSchemaOptions = {
            schema,
            fetcher,
        };
        const remoteSchema = makeRemoteExecutableSchema(remoteSchemaOptions);
        hooks.on('buildSdkFn', ({ fieldName, replaceFn, schema }) => {
            replaceFn((args, context, info) => {
                const delegationOptions = {
                    operation: info.operation.operation,
                    fieldName,
                    schema,
                    args,
                    info,
                    context,
                };
                return delegateToSchema(delegationOptions);
            });
        });
        hooks.on('destroy', () => gateway.stop());
        return {
            schema: remoteSchema,
        };
    },
};

export default handler;
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