@graphql-tools/mock/esm/mockServer.js

A set of utils for faster development of GraphQL tools

import { graphql, isSchema } from 'graphql';
import { makeExecutableSchema } from '@graphql-tools/schema';
import { addMocksToSchema } from './addMocksToSchema.js';
/**
 * A convenience wrapper on top of `addMocksToSchema`. It adds your mock resolvers
 * to your schema and returns a client that will correctly execute your query with
 * variables. Note: when executing queries from the returned server, context and
 * root will both equal `{}`.
 * @param schema The schema to which to add mocks. This can also be a set of type
 * definitions instead.
 * @param mocks The mocks to add to the schema.
 * @param preserveResolvers Set to `true` to prevent existing resolvers from being
 * overwritten to provide mock data. This can be used to mock some parts of the
 * server and not others.
 * @param mockGenerationBehavior Set to `'deterministic'` if the default random
 * mock generation behavior causes flakiness.
 */
export function mockServer(schema, mocks, preserveResolvers = false, mockGenerationBehavior) {
    const mockedSchema = addMocksToSchema({
        schema: isSchema(schema)
            ? schema
            : makeExecutableSchema({
                typeDefs: schema,
            }),
        mocks,
        mockGenerationBehavior,
        preserveResolvers,
    });
    return {
        query: (query, vars) => graphql({
            schema: mockedSchema,
            source: query,
            rootValue: {},
            contextValue: {},
            variableValues: vars,
        }),
    };
}