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@graphql-tools/delegate
Advanced tools
@graphql-tools/delegate is a package that provides utilities for schema delegation in GraphQL. It allows you to delegate execution of a query to a different schema, enabling schema stitching, remote schema execution, and more.
Schema Delegation
This feature allows you to delegate a query to another schema. In this example, a simple schema is created and a query is delegated to it, returning 'Hello world!'.
const { delegateToSchema } = require('@graphql-tools/delegate');
const { makeExecutableSchema } = require('@graphql-tools/schema');
const schema = makeExecutableSchema({
typeDefs: `
type Query {
hello: String
}
`,
resolvers: {
Query: {
hello: () => 'Hello world!'
}
}
});
const result = await delegateToSchema({
schema,
operation: 'query',
fieldName: 'hello',
context: {},
info: {}
});
console.log(result); // Outputs: Hello world!
Remote Schema Execution
This feature allows you to execute queries against a remote schema. In this example, a remote schema is made executable and a query is delegated to it.
const { makeRemoteExecutableSchema } = require('@graphql-tools/wrap');
const { HttpLink } = require('apollo-link-http');
const fetch = require('node-fetch');
const link = new HttpLink({ uri: 'http://remote-graphql-server.com/graphql', fetch });
const schema = makeRemoteExecutableSchema({ link });
const result = await delegateToSchema({
schema,
operation: 'query',
fieldName: 'remoteField',
context: {},
info: {}
});
console.log(result);
Schema Stitching
This feature allows you to stitch multiple schemas together into a single schema. In this example, two schemas are stitched together and queries are delegated to each of them.
const { stitchSchemas } = require('@graphql-tools/stitch');
const schemaA = makeExecutableSchema({
typeDefs: `
type Query {
fieldA: String
}
`,
resolvers: {
Query: {
fieldA: () => 'Field A'
}
}
});
const schemaB = makeExecutableSchema({
typeDefs: `
type Query {
fieldB: String
}
`,
resolvers: {
Query: {
fieldB: () => 'Field B'
}
}
});
const stitchedSchema = stitchSchemas({
subschemas: [
{ schema: schemaA },
{ schema: schemaB }
]
});
const resultA = await delegateToSchema({
schema: stitchedSchema,
operation: 'query',
fieldName: 'fieldA',
context: {},
info: {}
});
const resultB = await delegateToSchema({
schema: stitchedSchema,
operation: 'query',
fieldName: 'fieldB',
context: {},
info: {}
});
console.log(resultA); // Outputs: Field A
console.log(resultB); // Outputs: Field B
Apollo Server is a community-maintained open-source GraphQL server that works with any GraphQL schema. It provides a straightforward setup for creating a GraphQL server and supports schema stitching and remote schema execution, similar to @graphql-tools/delegate.
GraphQL Yoga is a fully-featured GraphQL server with focus on easy setup, performance, and great developer experience. It supports schema stitching and remote schema execution, making it comparable to @graphql-tools/delegate.
GraphQL Tools is a set of utilities to build and maintain GraphQL schemas and resolvers. It includes schema stitching and delegation capabilities, similar to @graphql-tools/delegate.
Check API Reference for more information about this package; https://www.graphql-tools.com/docs/api/modules/delegate_src
You can also learn more about Schema Delegation in this chapter; https://www.graphql-tools.com/docs/schema-delegation
FAQs
A set of utils for faster development of GraphQL tools
We found that @graphql-tools/delegate demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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