GRelDAL custom operations without Database interactions

index.js

const { mapSchema } = require("greldal");
const { graphql, GraphQLString } = require("graphql");

const customOperation = {
    operationType: "query",
    name: "printHello",
    fieldConfig: {
        type: GraphQLString,
        description: "Prints hello",
        resolve: (obj, args, context, info) => {
            return "hello";
        }
    }
}

const customOperationWithArgs = {
    operationType: "query",
    name: "printGreeting",
    fieldConfig: {
        type: GraphQLString,
        args: {
            name: {
                type: GraphQLString,
                defaultValue: "Markus"
            }
        },
        description: "Prints hello",
        resolve: (obj, args, context, info) => {
            return `hello ${args.name}`;
        }
    }
}

const generatedSchema = mapSchema([
    customOperation,
    customOperationWithArgs
]);

(async () => {
    const result1 = await graphql(generatedSchema, `
        query {
            printHello
        }
    `);

    console.log('result1: ', result1);

    const result2 = await graphql(generatedSchema, `
        query {
            printGreeting
        }
    `);

    console.log('result2: ', result2);

    const result3 = await graphql(generatedSchema, `
        query {
            printGreeting(name: "Lorefnon")
        }
    `);

    console.log('result3: ', result3);
})();