graphql/validation/rules/FragmentsOnCompositeTypesRule.js

A Query Language and Runtime which can target any service.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.FragmentsOnCompositeTypesRule = FragmentsOnCompositeTypesRule;

var _GraphQLError = require("../../error/GraphQLError.js");

var _printer = require("../../language/printer.js");

var _definition = require("../../type/definition.js");

var _typeFromAST = require("../../utilities/typeFromAST.js");

/**
 * Fragments on composite type
 *
 * Fragments use a type condition to determine if they apply, since fragments
 * can only be spread into a composite type (object, interface, or union), the
 * type condition must also be a composite type.
 */
function FragmentsOnCompositeTypesRule(context) {
  return {
    InlineFragment: function InlineFragment(node) {
      var typeCondition = node.typeCondition;

      if (typeCondition) {
        var type = (0, _typeFromAST.typeFromAST)(context.getSchema(), typeCondition);

        if (type && !(0, _definition.isCompositeType)(type)) {
          var typeStr = (0, _printer.print)(typeCondition);
          context.reportError(new _GraphQLError.GraphQLError("Fragment cannot condition on non composite type \"".concat(typeStr, "\"."), typeCondition));
        }
      }
    },
    FragmentDefinition: function FragmentDefinition(node) {
      var type = (0, _typeFromAST.typeFromAST)(context.getSchema(), node.typeCondition);

      if (type && !(0, _definition.isCompositeType)(type)) {
        var typeStr = (0, _printer.print)(node.typeCondition);
        context.reportError(new _GraphQLError.GraphQLError("Fragment \"".concat(node.name.value, "\" cannot condition on non composite type \"").concat(typeStr, "\"."), node.typeCondition));
      }
    }
  };
}