node_modules.graphql.validation.rules.PossibleFragmentSpreads.mjs Maven / Gradle / Ivy

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Maven plugin for generating graphql clients

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import { GraphQLError } from '../../error'; /**
                                             * 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.
                                             *
                                             *  strict
                                             */

import { doTypesOverlap } from '../../utilities/typeComparators';
import { typeFromAST } from '../../utilities/typeFromAST';
import { isCompositeType } from '../../type/definition';


export function typeIncompatibleSpreadMessage(fragName, parentType, fragType) {
  return 'Fragment "' + fragName + '" cannot be spread here as objects of ' + ('type "' + String(parentType) + '" can never be of type "' + String(fragType) + '".');
}

export function typeIncompatibleAnonSpreadMessage(parentType, fragType) {
  return 'Fragment cannot be spread here as objects of ' + ('type "' + String(parentType) + '" can never be of type "' + String(fragType) + '".');
}

/**
 * Possible fragment spread
 *
 * A fragment spread is only valid if the type condition could ever possibly
 * be true: if there is a non-empty intersection of the possible parent types,
 * and possible types which pass the type condition.
 */
export function PossibleFragmentSpreads(context) {
  return {
    InlineFragment: function InlineFragment(node) {
      var fragType = context.getType();
      var parentType = context.getParentType();
      if (isCompositeType(fragType) && isCompositeType(parentType) && !doTypesOverlap(context.getSchema(), fragType, parentType)) {
        context.reportError(new GraphQLError(typeIncompatibleAnonSpreadMessage(parentType, fragType), [node]));
      }
    },
    FragmentSpread: function FragmentSpread(node) {
      var fragName = node.name.value;
      var fragType = getFragmentType(context, fragName);
      var parentType = context.getParentType();
      if (fragType && parentType && !doTypesOverlap(context.getSchema(), fragType, parentType)) {
        context.reportError(new GraphQLError(typeIncompatibleSpreadMessage(fragName, parentType, fragType), [node]));
      }
    }
  };
}

function getFragmentType(context, name) {
  var frag = context.getFragment(name);
  if (frag) {
    var type = typeFromAST(context.getSchema(), frag.typeCondition);
    if (isCompositeType(type)) {
      return type;
    }
  }
}