buildAST.js

buildAST.js

const { buildSchema, execute, parse } = require('graphql');

const idl = `
type Query {
  version: String!
  name: String!
}

extend type Query {
  hello: String!
}
`;

const fullTypeFragment = `
  fragment FullType on __Type {
    fields(includeDeprecated: true) {
      name
      description
      args {
        ...InputValue
      }
      type {
        ...TypeRef
      }
      isDeprecated
      deprecationReason
    }
    inputFields {
      ...InputValue
    }
    interfaces {
      ...TypeRef
    }
    enumValues(includeDeprecated: true) {
      name
      description
      isDeprecated
      deprecationReason
    }
    possibleTypes {
      ...TypeRef
    }
  }`;

const inputValueFragment = `
  fragment InputValue on __InputValue {
    name
    description
    type { ...TypeRef }
    defaultValue
  }`;

const typeRefFragment = `
  fragment TypeRef on __Type {
    kind
    name
    description
    ofType {
      kind
      name
      description
      ofType {
        kind
        name
        description
        ofType {
          kind
          name
          description
          ofType {
            kind
            name
            description
            ofType {
              kind
              name
              description
              ofType {
                kind
                name
                description
                ofType {
                  kind
                  name
                  description
                }
              }
            }
          }
        }
      }
    }
  }`;

const query = `
query IntrospectionQuery {
  __schema {
    queryType { name description kind}
    mutationType { name description kind }
    subscriptionType { name description kind }
    types {
      name
      kind
      description
      ...FullType
    }
    directives {
      name
      description
      locations
      args {
        ...InputValue
      }
    }
  }
}

${fullTypeFragment}
${inputValueFragment}
${typeRefFragment}
`;

const parsed = parse(query);
const schema = buildSchema(idl);

const introspection = execute(schema, parsed);

console.log(JSON.stringify(introspection, null, 2));