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apollo-schema-extend

v0.3.0

Published

Extends your Apollo Server Express based graphql server with an external graphql source

Downloads

32

Readme

apollo-schema-extend

Extends your Apollo Server Express based graphql server with an external graphql source. Merges the external schema into the local schema and forwards any (parts of) request to be resolved by the external source. This library is intended for situations where Apollo Federation doesn't provide sufficient control or is not an option for other reasons.

Basic usage:

In this example myExternalSchema is a GraphQLSchema retrieved by using an IntrospectionQuery and GqlDataSource is a derived class of apollo-datasource-graphql.

const withMyExternalSchema = withExternalSchema(myExternalSchema, {
  dataSource: { name: 'external', factory: () => new GqlDataSource('https://myExternal.com/graphql') },
})

const apolloServer = new ApolloServer(withMyExternalSchema(localApolloServerConfig))

Recommended data source:

import { GraphQLDataSource } from 'apollo-datasource-graphql'
import { Context } from '...'

export class GqlDataSource extends GraphQLDataSource<Context> {
  constructor(baseUrl: string) {
    super()
    this.baseURL = baseUrl
  }

  protected willSendRequest(request: any) {
    // Add authorization header
  }
}

Installation

Using npm:

$ npm install apollo-schema-extend

Using yarn:

$ yarn add apollo-schema-extend

Restrictions

The current version requires the apollo server config to contain the following fields:

  • resolvers: must be IResolvers<any, any> (array is not supported)
  • typeDefs
  • dataSources