graphile-build

import { makeSchema, Plugin } from 'graphile-build'; import { GraphQLSchema, GraphQLObjectType, GraphQLString } from 'graphql'; // Define a simple plugin that adds a 'hello' field to the Query type const HelloPlugin: Plugin = (builder) => { builder.hook("GraphQLObjectType:fields", (fields, build, context) => { const { Self, scope } = context; // Ensure we are modifying the root Query type if (scope.isRootQuery) { return { ...fields, hello: { type: GraphQLString, resolve: () => "Hello from Graphile Build!", description: "A simple greeting field." }, }; } return fields; }); }; async function main() { try { const schema: GraphQLSchema = await makeSchema({ plugins: [HelloPlugin], // Additional options can be passed here }); console.log("GraphQL schema built successfully!"); // Verify the 'hello' field exists on the Query type const queryType = schema.getQueryType(); if (queryType) { const helloField = queryType.getFields().hello; console.log(`Query type has 'hello' field: ${!!helloField}`); if (helloField) { console.log(`Hello field description: "${helloField.description}"`); } } // Example: You could now use this schema with a GraphQL server // import { graphql } from 'graphql'; // const result = await graphql({ schema, source: '{ hello }' }); // console.log(result.data?.hello); } catch (error) { console.error("Error building schema:", error); } } main();