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Maven plugin for generating graphql clients
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/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict
 */

import type { DirectiveLocationEnum } from '../language/directiveLocation';

export type IntrospectionOptions = {|
  // Whether to include descriptions in the introspection result.
  // Default: true
  descriptions: boolean,
|};

export function getIntrospectionQuery(options?: IntrospectionOptions): string {
  const descriptions = !(options && options.descriptions === false);
  return `
    query IntrospectionQuery {
      __schema {
        queryType { name }
        mutationType { name }
        subscriptionType { name }
        types {
          ...FullType
        }
        directives {
          name
          ${descriptions ? 'description' : ''}
          locations
          args {
            ...InputValue
          }
        }
      }
    }

    fragment FullType on __Type {
      kind
      name
      ${descriptions ? 'description' : ''}
      fields(includeDeprecated: true) {
        name
        ${descriptions ? 'description' : ''}
        args {
          ...InputValue
        }
        type {
          ...TypeRef
        }
        isDeprecated
        deprecationReason
      }
      inputFields {
        ...InputValue
      }
      interfaces {
        ...TypeRef
      }
      enumValues(includeDeprecated: true) {
        name
        ${descriptions ? 'description' : ''}
        isDeprecated
        deprecationReason
      }
      possibleTypes {
        ...TypeRef
      }
    }

    fragment InputValue on __InputValue {
      name
      ${descriptions ? 'description' : ''}
      type { ...TypeRef }
      defaultValue
    }

    fragment TypeRef on __Type {
      kind
      name
      ofType {
        kind
        name
        ofType {
          kind
          name
          ofType {
            kind
            name
            ofType {
              kind
              name
              ofType {
                kind
                name
                ofType {
                  kind
                  name
                  ofType {
                    kind
                    name
                  }
                }
              }
            }
          }
        }
      }
    }
  `;
}

export const introspectionQuery = getIntrospectionQuery();

export type IntrospectionQuery = {|
  +__schema: IntrospectionSchema,
|};

export type IntrospectionSchema = {|
  +queryType: IntrospectionNamedTypeRef,
  +mutationType: ?IntrospectionNamedTypeRef,
  +subscriptionType: ?IntrospectionNamedTypeRef,
  +types: $ReadOnlyArray,
  +directives: $ReadOnlyArray,
|};

export type IntrospectionType =
  | IntrospectionScalarType
  | IntrospectionObjectType
  | IntrospectionInterfaceType
  | IntrospectionUnionType
  | IntrospectionEnumType
  | IntrospectionInputObjectType;

export type IntrospectionOutputType =
  | IntrospectionScalarType
  | IntrospectionObjectType
  | IntrospectionInterfaceType
  | IntrospectionUnionType
  | IntrospectionEnumType;

export type IntrospectionInputType =
  | IntrospectionScalarType
  | IntrospectionEnumType
  | IntrospectionInputObjectType;

export type IntrospectionScalarType = {
  +kind: 'SCALAR',
  +name: string,
  +description?: ?string,
};

export type IntrospectionObjectType = {
  +kind: 'OBJECT',
  +name: string,
  +description?: ?string,
  +fields: $ReadOnlyArray,
  +interfaces: $ReadOnlyArray<
    IntrospectionNamedTypeRef,
  >,
};

export type IntrospectionInterfaceType = {
  +kind: 'INTERFACE',
  +name: string,
  +description?: ?string,
  +fields: $ReadOnlyArray,
  +possibleTypes: $ReadOnlyArray<
    IntrospectionNamedTypeRef,
  >,
};

export type IntrospectionUnionType = {
  +kind: 'UNION',
  +name: string,
  +description?: ?string,
  +possibleTypes: $ReadOnlyArray<
    IntrospectionNamedTypeRef,
  >,
};

export type IntrospectionEnumType = {
  +kind: 'ENUM',
  +name: string,
  +description?: ?string,
  +enumValues: $ReadOnlyArray,
};

export type IntrospectionInputObjectType = {
  +kind: 'INPUT_OBJECT',
  +name: string,
  +description?: ?string,
  +inputFields: $ReadOnlyArray,
};

export type IntrospectionListTypeRef<
  T: IntrospectionTypeRef = IntrospectionTypeRef,
> = {
  +kind: 'LIST',
  +ofType: T,
};

export type IntrospectionNonNullTypeRef<
  T: IntrospectionTypeRef = IntrospectionTypeRef,
> = {
  +kind: 'NON_NULL',
  +ofType: T,
};

export type IntrospectionTypeRef =
  | IntrospectionNamedTypeRef
  | IntrospectionListTypeRef
  | IntrospectionNonNullTypeRef<
      | IntrospectionNamedTypeRef
      | IntrospectionListTypeRef,
    >;

export type IntrospectionOutputTypeRef =
  | IntrospectionNamedTypeRef
  | IntrospectionListTypeRef
  | IntrospectionNonNullTypeRef<
      | IntrospectionNamedTypeRef
      | IntrospectionListTypeRef,
    >;

export type IntrospectionInputTypeRef =
  | IntrospectionNamedTypeRef
  | IntrospectionListTypeRef
  | IntrospectionNonNullTypeRef<
      | IntrospectionNamedTypeRef
      | IntrospectionListTypeRef,
    >;

export type IntrospectionNamedTypeRef<
  T: IntrospectionType = IntrospectionType,
> = {
  +kind: $PropertyType,
  +name: string,
};

export type IntrospectionField = {|
  +name: string,
  +description?: ?string,
  +args: $ReadOnlyArray,
  +type: IntrospectionOutputTypeRef,
  +isDeprecated: boolean,
  +deprecationReason: ?string,
|};

export type IntrospectionInputValue = {|
  +name: string,
  +description?: ?string,
  +type: IntrospectionInputTypeRef,
  +defaultValue: ?string,
|};

export type IntrospectionEnumValue = {|
  +name: string,
  +description?: ?string,
  +isDeprecated: boolean,
  +deprecationReason: ?string,
|};

export type IntrospectionDirective = {|
  +name: string,
  +description?: ?string,
  +locations: $ReadOnlyArray,
  +args: $ReadOnlyArray,
|};