How to use the apollo-utilities.assign function in apollo-utilities

variables?: Object;
    dataIdFromObject?: IdGetter;
    fragmentMatcherFunction?: FragmentMatcher;
  }): NormalizedCache {
    // XXX TODO REFACTOR: this is a temporary workaround until query normalization is made to work with documents.
    const operationDefinition = getOperationDefinition(document)!;

    try {
      return this.writeSelectionSetToStore({
        result,
        dataId,
        selectionSet: operationDefinition.selectionSet,
        context: {
          store,
          processedData: {},
          variables: assign(
            {},
            getDefaultValues(operationDefinition),
            variables,
          ),
          dataIdFromObject,
          fragmentMap: createFragmentMap(getFragmentDefinitions(document)),
          fragmentMatcherFunction,
        },
      });
    } catch (e) {
      throw enhanceErrorWithDocument(e, document);
    }
  }

optimisticResponse,
    updateQueries: updateQueriesByName,
    refetchQueries = [],
    update: updateWithProxyFn,
    errorPolicy = 'ignore',
  }: MutationOptions): Promise> {
    if (!mutation) {
      throw new Error(
        'mutation option is required. You must specify your GraphQL document in the mutation option.',
      );
    }

    const mutationId = this.generateQueryId();
    mutation = this.dataStore.getCache().transformDocument(mutation);

    variables = assign(
      {},
      getDefaultValues(getMutationDefinition(mutation)),
      variables,
    );

    const mutationString = print(mutation);
    const request = {
      query: mutation,
      variables,
      operationName: getOperationName(mutation) || undefined,
    } as Request;

    this.setQuery(mutationId, () => ({ document: mutation }));

    // Create a map of update queries by id to the query instead of by name.
    const generateUpdateQueriesInfo: () => {

public diffQueryAgainstStore({
    store,
    query,
    variables,
    previousResult,
    returnPartialData = true,
    rootId = 'ROOT_QUERY',
    fragmentMatcherFunction,
    config,
  }: DiffQueryAgainstStoreOptions): Cache.DiffResult {
    // Throw the right validation error by trying to find a query in the document
    const queryDefinition = getQueryDefinition(query);

    variables = assign({}, getDefaultValues(queryDefinition), variables);

    const context: ReadStoreContext = {
      // Global settings
      store,
      dataIdFromObject: config && config.dataIdFromObject,
      cacheRedirects: (config && config.cacheRedirects) || {},
    };

    const execResult = this.executeStoreQuery({
      query,
      rootValue: {
        type: 'id',
        id: rootId,
        generated: true,
        typename: 'Query',
      },

throw new Error(
        'client.watchQuery cannot be called with fetchPolicy set to "standby"',
      );
    }

    // get errors synchronously
    const queryDefinition = getQueryDefinition(options.query);

    // assign variable default values if supplied
    if (
      queryDefinition.variableDefinitions &&
      queryDefinition.variableDefinitions.length
    ) {
      const defaultValues = getDefaultValues(queryDefinition);

      options.variables = assign({}, defaultValues, options.variables);
    }

    if (typeof options.notifyOnNetworkStatusChange === 'undefined') {
      options.notifyOnNetworkStatusChange = false;
    }

    let transformedOptions = { ...options } as WatchQueryOptions;

    return new ObservableQuery({
      scheduler: this.scheduler,
      options: transformedOptions,
      shouldSubscribe: shouldSubscribe,
    });
  }

export function writeResultToStore(_a) {
    var dataId = _a.dataId, result = _a.result, document = _a.document, _b = _a.storeFactory, storeFactory = _b === void 0 ? defaultNormalizedCacheFactory : _b, _c = _a.store, store = _c === void 0 ? storeFactory() : _c, variables = _a.variables, dataIdFromObject = _a.dataIdFromObject, fragmentMatcherFunction = _a.fragmentMatcherFunction;
    var operationDefinition = getOperationDefinition(document);
    var selectionSet = operationDefinition.selectionSet;
    var fragmentMap = createFragmentMap(getFragmentDefinitions(document));
    variables = assign({}, getDefaultValues(operationDefinition), variables);
    try {
        return writeSelectionSetToStore({
            result: result,
            dataId: dataId,
            selectionSet: selectionSet,
            context: {
                store: store,
                storeFactory: storeFactory,
                processedData: {},
                variables: variables,
                dataIdFromObject: dataIdFromObject,
                fragmentMap: fragmentMap,
                fragmentMatcherFunction: fragmentMatcherFunction,
            },
        });
    }

QueryManager.prototype.mutate = function (_a) {
        var _this = this;
        var mutation = _a.mutation, variables = _a.variables, optimisticResponse = _a.optimisticResponse, updateQueriesByName = _a.updateQueries, _b = _a.refetchQueries, refetchQueries = _b === void 0 ? [] : _b, updateWithProxyFn = _a.update, _c = _a.errorPolicy, errorPolicy = _c === void 0 ? 'none' : _c, _d = _a.context, context = _d === void 0 ? {} : _d;
        if (!mutation) {
            throw new Error('mutation option is required. You must specify your GraphQL document in the mutation option.');
        }
        var mutationId = this.generateQueryId();
        var cache = this.dataStore.getCache();
        (mutation = cache.transformDocument(mutation)),
            (variables = assign({}, getDefaultValues(getMutationDefinition(mutation)), variables));
        var mutationString = print(mutation);
        var request = {
            query: mutation,
            variables: variables,
            operationName: getOperationName(mutation) || undefined,
            context: context,
        };
        this.setQuery(mutationId, function () { return ({ document: mutation }); });
        var generateUpdateQueriesInfo = function () {
            var ret = {};
            if (updateQueriesByName) {
                Object.keys(updateQueriesByName).forEach(function (queryName) {
                    return (_this.queryIdsByName[queryName] || []).forEach(function (queryId) {
                        ret[queryId] = {
                            updater: updateQueriesByName[queryName],
                            query: _this.queryStore.get(queryId),

export function diffQueryAgainstStore(_a) {
    var store = _a.store, query = _a.query, variables = _a.variables, previousResult = _a.previousResult, _b = _a.returnPartialData, returnPartialData = _b === void 0 ? true : _b, _c = _a.rootId, rootId = _c === void 0 ? 'ROOT_QUERY' : _c, fragmentMatcherFunction = _a.fragmentMatcherFunction, config = _a.config;
    var queryDefinition = getQueryDefinition(query);
    variables = assign({}, getDefaultValues(queryDefinition), variables);
    var context = {
        store: store,
        returnPartialData: returnPartialData,
        cacheResolvers: (config && config.cacheResolvers) || {},
        hasMissingField: false,
    };
    var rootIdValue = {
        type: 'id',
        id: rootId,
        previousResult: previousResult,
    };
    var result = graphqlAnywhere(readStoreResolver, query, rootIdValue, context, variables, {
        fragmentMatcher: fragmentMatcherFunction,
        resultMapper: resultMapper,
    });
    return {

QueryManager.prototype.watchQuery = function (options, shouldSubscribe) {
        if (shouldSubscribe === void 0) { shouldSubscribe = true; }
        if (options.fetchPolicy === 'standby') {
            throw new Error('client.watchQuery cannot be called with fetchPolicy set to "standby"');
        }
        var queryDefinition = getQueryDefinition(options.query);
        if (queryDefinition.variableDefinitions &&
            queryDefinition.variableDefinitions.length) {
            var defaultValues = getDefaultValues(queryDefinition);
            options.variables = assign({}, defaultValues, options.variables);
        }
        if (typeof options.notifyOnNetworkStatusChange === 'undefined') {
            options.notifyOnNetworkStatusChange = false;
        }
        var transformedOptions = __assign({}, options);
        return new ObservableQuery({
            scheduler: this.scheduler,
            options: transformedOptions,
            shouldSubscribe: shouldSubscribe,
        });
    };
    QueryManager.prototype.query = function (options) {