WIP - add extractor, generate snippet_data

node_modules/graphql/execution/execute.js

@@ -0,0 +1,863 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.execute = execute;
+exports.responsePathAsArray = responsePathAsArray;
+exports.addPath = addPath;
+exports.assertValidExecutionArguments = assertValidExecutionArguments;
+exports.buildExecutionContext = buildExecutionContext;
+exports.collectFields = collectFields;
+exports.buildResolveInfo = buildResolveInfo;
+exports.resolveFieldValueOrError = resolveFieldValueOrError;
+exports.getFieldDef = getFieldDef;
+exports.defaultFieldResolver = exports.defaultTypeResolver = void 0;
+
+var _iterall = require("iterall");
+
+var _GraphQLError = require("../error/GraphQLError");
+
+var _locatedError = require("../error/locatedError");
+
+var _inspect = _interopRequireDefault(require("../jsutils/inspect"));
+
+var _invariant = _interopRequireDefault(require("../jsutils/invariant"));
+
+var _isInvalid = _interopRequireDefault(require("../jsutils/isInvalid"));
+
+var _isNullish = _interopRequireDefault(require("../jsutils/isNullish"));
+
+var _isPromise = _interopRequireDefault(require("../jsutils/isPromise"));
+
+var _isObjectLike = _interopRequireDefault(require("../jsutils/isObjectLike"));
+
+var _memoize = _interopRequireDefault(require("../jsutils/memoize3"));
+
+var _promiseForObject = _interopRequireDefault(require("../jsutils/promiseForObject"));
+
+var _promiseReduce = _interopRequireDefault(require("../jsutils/promiseReduce"));
+
+var _getOperationRootType = require("../utilities/getOperationRootType");
+
+var _typeFromAST = require("../utilities/typeFromAST");
+
+var _kinds = require("../language/kinds");
+
+var _values = require("./values");
+
+var _definition = require("../type/definition");
+
+var _introspection = require("../type/introspection");
+
+var _directives = require("../type/directives");
+
+var _validate = require("../type/validate");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function execute(argsOrSchema, document, rootValue, contextValue, variableValues, operationName, fieldResolver, typeResolver) {
+  /* eslint-enable no-redeclare */
+  // Extract arguments from object args if provided.
+  return arguments.length === 1 ? executeImpl(argsOrSchema) : executeImpl({
+    schema: argsOrSchema,
+    document: document,
+    rootValue: rootValue,
+    contextValue: contextValue,
+    variableValues: variableValues,
+    operationName: operationName,
+    fieldResolver: fieldResolver,
+    typeResolver: typeResolver
+  });
+}
+
+function executeImpl(args) {
+  var schema = args.schema,
+      document = args.document,
+      rootValue = args.rootValue,
+      contextValue = args.contextValue,
+      variableValues = args.variableValues,
+      operationName = args.operationName,
+      fieldResolver = args.fieldResolver,
+      typeResolver = args.typeResolver; // If arguments are missing or incorrect, throw an error.
+
+  assertValidExecutionArguments(schema, document, variableValues); // If a valid execution context cannot be created due to incorrect arguments,
+  // a "Response" with only errors is returned.
+
+  var exeContext = buildExecutionContext(schema, document, rootValue, contextValue, variableValues, operationName, fieldResolver, typeResolver); // Return early errors if execution context failed.
+
+  if (Array.isArray(exeContext)) {
+    return {
+      errors: exeContext
+    };
+  } // Return a Promise that will eventually resolve to the data described by
+  // The "Response" section of the GraphQL specification.
+  //
+  // If errors are encountered while executing a GraphQL field, only that
+  // field and its descendants will be omitted, and sibling fields will still
+  // be executed. An execution which encounters errors will still result in a
+  // resolved Promise.
+
+
+  var data = executeOperation(exeContext, exeContext.operation, rootValue);
+  return buildResponse(exeContext, data);
+}
+/**
+ * Given a completed execution context and data, build the { errors, data }
+ * response defined by the "Response" section of the GraphQL specification.
+ */
+
+
+function buildResponse(exeContext, data) {
+  if ((0, _isPromise.default)(data)) {
+    return data.then(function (resolved) {
+      return buildResponse(exeContext, resolved);
+    });
+  }
+
+  return exeContext.errors.length === 0 ? {
+    data: data
+  } : {
+    errors: exeContext.errors,
+    data: data
+  };
+}
+/**
+ * Given a ResponsePath (found in the `path` entry in the information provided
+ * as the last argument to a field resolver), return an Array of the path keys.
+ */
+
+
+function responsePathAsArray(path) {
+  var flattened = [];
+  var curr = path;
+
+  while (curr) {
+    flattened.push(curr.key);
+    curr = curr.prev;
+  }
+
+  return flattened.reverse();
+}
+/**
+ * Given a ResponsePath and a key, return a new ResponsePath containing the
+ * new key.
+ */
+
+
+function addPath(prev, key) {
+  return {
+    prev: prev,
+    key: key
+  };
+}
+/**
+ * Essential assertions before executing to provide developer feedback for
+ * improper use of the GraphQL library.
+ */
+
+
+function assertValidExecutionArguments(schema, document, rawVariableValues) {
+  !document ? (0, _invariant.default)(0, 'Must provide document') : void 0; // If the schema used for execution is invalid, throw an error.
+
+  (0, _validate.assertValidSchema)(schema); // Variables, if provided, must be an object.
+
+  !(rawVariableValues == null || (0, _isObjectLike.default)(rawVariableValues)) ? (0, _invariant.default)(0, 'Variables must be provided as an Object where each property is a variable value. Perhaps look to see if an unparsed JSON string was provided.') : void 0;
+}
+/**
+ * Constructs a ExecutionContext object from the arguments passed to
+ * execute, which we will pass throughout the other execution methods.
+ *
+ * Throws a GraphQLError if a valid execution context cannot be created.
+ */
+
+
+function buildExecutionContext(schema, document, rootValue, contextValue, rawVariableValues, operationName, fieldResolver, typeResolver) {
+  var errors = [];
+  var operation;
+  var hasMultipleAssumedOperations = false;
+  var fragments = Object.create(null);
+
+  for (var i = 0; i < document.definitions.length; i++) {
+    var definition = document.definitions[i];
+
+    switch (definition.kind) {
+      case _kinds.Kind.OPERATION_DEFINITION:
+        if (!operationName && operation) {
+          hasMultipleAssumedOperations = true;
+        } else if (!operationName || definition.name && definition.name.value === operationName) {
+          operation = definition;
+        }
+
+        break;
+
+      case _kinds.Kind.FRAGMENT_DEFINITION:
+        fragments[definition.name.value] = definition;
+        break;
+    }
+  }
+
+  if (!operation) {
+    if (operationName) {
+      errors.push(new _GraphQLError.GraphQLError("Unknown operation named \"".concat(operationName, "\".")));
+    } else {
+      errors.push(new _GraphQLError.GraphQLError('Must provide an operation.'));
+    }
+  } else if (hasMultipleAssumedOperations) {
+    errors.push(new _GraphQLError.GraphQLError('Must provide operation name if query contains multiple operations.'));
+  }
+
+  var variableValues;
+
+  if (operation) {
+    var coercedVariableValues = (0, _values.getVariableValues)(schema, operation.variableDefinitions || [], rawVariableValues || {});
+
+    if (coercedVariableValues.errors) {
+      errors.push.apply(errors, coercedVariableValues.errors);
+    } else {
+      variableValues = coercedVariableValues.coerced;
+    }
+  }
+
+  if (errors.length !== 0) {
+    return errors;
+  }
+
+  !operation ? (0, _invariant.default)(0, 'Has operation if no errors.') : void 0;
+  !variableValues ? (0, _invariant.default)(0, 'Has variables if no errors.') : void 0;
+  return {
+    schema: schema,
+    fragments: fragments,
+    rootValue: rootValue,
+    contextValue: contextValue,
+    operation: operation,
+    variableValues: variableValues,
+    fieldResolver: fieldResolver || defaultFieldResolver,
+    typeResolver: typeResolver || defaultTypeResolver,
+    errors: errors
+  };
+}
+/**
+ * Implements the "Evaluating operations" section of the spec.
+ */
+
+
+function executeOperation(exeContext, operation, rootValue) {
+  var type = (0, _getOperationRootType.getOperationRootType)(exeContext.schema, operation);
+  var fields = collectFields(exeContext, type, operation.selectionSet, Object.create(null), Object.create(null));
+  var path = undefined; // Errors from sub-fields of a NonNull type may propagate to the top level,
+  // at which point we still log the error and null the parent field, which
+  // in this case is the entire response.
+  //
+  // Similar to completeValueCatchingError.
+
+  try {
+    var result = operation.operation === 'mutation' ? executeFieldsSerially(exeContext, type, rootValue, path, fields) : executeFields(exeContext, type, rootValue, path, fields);
+
+    if ((0, _isPromise.default)(result)) {
+      return result.then(undefined, function (error) {
+        exeContext.errors.push(error);
+        return Promise.resolve(null);
+      });
+    }
+
+    return result;
+  } catch (error) {
+    exeContext.errors.push(error);
+    return null;
+  }
+}
+/**
+ * Implements the "Evaluating selection sets" section of the spec
+ * for "write" mode.
+ */
+
+
+function executeFieldsSerially(exeContext, parentType, sourceValue, path, fields) {
+  return (0, _promiseReduce.default)(Object.keys(fields), function (results, responseName) {
+    var fieldNodes = fields[responseName];
+    var fieldPath = addPath(path, responseName);
+    var result = resolveField(exeContext, parentType, sourceValue, fieldNodes, fieldPath);
+
+    if (result === undefined) {
+      return results;
+    }
+
+    if ((0, _isPromise.default)(result)) {
+      return result.then(function (resolvedResult) {
+        results[responseName] = resolvedResult;
+        return results;
+      });
+    }
+
+    results[responseName] = result;
+    return results;
+  }, Object.create(null));
+}
+/**
+ * Implements the "Evaluating selection sets" section of the spec
+ * for "read" mode.
+ */
+
+
+function executeFields(exeContext, parentType, sourceValue, path, fields) {
+  var results = Object.create(null);
+  var containsPromise = false;
+
+  for (var i = 0, keys = Object.keys(fields); i < keys.length; ++i) {
+    var responseName = keys[i];
+    var fieldNodes = fields[responseName];
+    var fieldPath = addPath(path, responseName);
+    var result = resolveField(exeContext, parentType, sourceValue, fieldNodes, fieldPath);
+
+    if (result !== undefined) {
+      results[responseName] = result;
+
+      if (!containsPromise && (0, _isPromise.default)(result)) {
+        containsPromise = true;
+      }
+    }
+  } // If there are no promises, we can just return the object
+
+
+  if (!containsPromise) {
+    return results;
+  } // Otherwise, results is a map from field name to the result of resolving that
+  // field, which is possibly a promise. Return a promise that will return this
+  // same map, but with any promises replaced with the values they resolved to.
+
+
+  return (0, _promiseForObject.default)(results);
+}
+/**
+ * Given a selectionSet, adds all of the fields in that selection to
+ * the passed in map of fields, and returns it at the end.
+ *
+ * CollectFields requires the "runtime type" of an object. For a field which
+ * returns an Interface or Union type, the "runtime type" will be the actual
+ * Object type returned by that field.
+ */
+
+
+function collectFields(exeContext, runtimeType, selectionSet, fields, visitedFragmentNames) {
+  for (var i = 0; i < selectionSet.selections.length; i++) {
+    var selection = selectionSet.selections[i];
+
+    switch (selection.kind) {
+      case _kinds.Kind.FIELD:
+        {
+          if (!shouldIncludeNode(exeContext, selection)) {
+            continue;
+          }
+
+          var name = getFieldEntryKey(selection);
+
+          if (!fields[name]) {
+            fields[name] = [];
+          }
+
+          fields[name].push(selection);
+          break;
+        }
+
+      case _kinds.Kind.INLINE_FRAGMENT:
+        {
+          if (!shouldIncludeNode(exeContext, selection) || !doesFragmentConditionMatch(exeContext, selection, runtimeType)) {
+            continue;
+          }
+
+          collectFields(exeContext, runtimeType, selection.selectionSet, fields, visitedFragmentNames);
+          break;
+        }
+
+      case _kinds.Kind.FRAGMENT_SPREAD:
+        {
+          var fragName = selection.name.value;
+
+          if (visitedFragmentNames[fragName] || !shouldIncludeNode(exeContext, selection)) {
+            continue;
+          }
+
+          visitedFragmentNames[fragName] = true;
+          var fragment = exeContext.fragments[fragName];
+
+          if (!fragment || !doesFragmentConditionMatch(exeContext, fragment, runtimeType)) {
+            continue;
+          }
+
+          collectFields(exeContext, runtimeType, fragment.selectionSet, fields, visitedFragmentNames);
+          break;
+        }
+    }
+  }
+
+  return fields;
+}
+/**
+ * Determines if a field should be included based on the @include and @skip
+ * directives, where @skip has higher precedence than @include.
+ */
+
+
+function shouldIncludeNode(exeContext, node) {
+  var skip = (0, _values.getDirectiveValues)(_directives.GraphQLSkipDirective, node, exeContext.variableValues);
+
+  if (skip && skip.if === true) {
+    return false;
+  }
+
+  var include = (0, _values.getDirectiveValues)(_directives.GraphQLIncludeDirective, node, exeContext.variableValues);
+
+  if (include && include.if === false) {
+    return false;
+  }
+
+  return true;
+}
+/**
+ * Determines if a fragment is applicable to the given type.
+ */
+
+
+function doesFragmentConditionMatch(exeContext, fragment, type) {
+  var typeConditionNode = fragment.typeCondition;
+
+  if (!typeConditionNode) {
+    return true;
+  }
+
+  var conditionalType = (0, _typeFromAST.typeFromAST)(exeContext.schema, typeConditionNode);
+
+  if (conditionalType === type) {
+    return true;
+  }
+
+  if ((0, _definition.isAbstractType)(conditionalType)) {
+    return exeContext.schema.isPossibleType(conditionalType, type);
+  }
+
+  return false;
+}
+/**
+ * Implements the logic to compute the key of a given field's entry
+ */
+
+
+function getFieldEntryKey(node) {
+  return node.alias ? node.alias.value : node.name.value;
+}
+/**
+ * Resolves the field on the given source object. In particular, this
+ * figures out the value that the field returns by calling its resolve function,
+ * then calls completeValue to complete promises, serialize scalars, or execute
+ * the sub-selection-set for objects.
+ */
+
+
+function resolveField(exeContext, parentType, source, fieldNodes, path) {
+  var fieldNode = fieldNodes[0];
+  var fieldName = fieldNode.name.value;
+  var fieldDef = getFieldDef(exeContext.schema, parentType, fieldName);
+
+  if (!fieldDef) {
+    return;
+  }
+
+  var resolveFn = fieldDef.resolve || exeContext.fieldResolver;
+  var info = buildResolveInfo(exeContext, fieldDef, fieldNodes, parentType, path); // Get the resolve function, regardless of if its result is normal
+  // or abrupt (error).
+
+  var result = resolveFieldValueOrError(exeContext, fieldDef, fieldNodes, resolveFn, source, info);
+  return completeValueCatchingError(exeContext, fieldDef.type, fieldNodes, info, path, result);
+}
+
+function buildResolveInfo(exeContext, fieldDef, fieldNodes, parentType, path) {
+  // The resolve function's optional fourth argument is a collection of
+  // information about the current execution state.
+  return {
+    fieldName: fieldDef.name,
+    fieldNodes: fieldNodes,
+    returnType: fieldDef.type,
+    parentType: parentType,
+    path: path,
+    schema: exeContext.schema,
+    fragments: exeContext.fragments,
+    rootValue: exeContext.rootValue,
+    operation: exeContext.operation,
+    variableValues: exeContext.variableValues
+  };
+} // Isolates the "ReturnOrAbrupt" behavior to not de-opt the `resolveField`
+// function. Returns the result of resolveFn or the abrupt-return Error object.
+
+
+function resolveFieldValueOrError(exeContext, fieldDef, fieldNodes, resolveFn, source, info) {
+  try {
+    // Build a JS object of arguments from the field.arguments AST, using the
+    // variables scope to fulfill any variable references.
+    // TODO: find a way to memoize, in case this field is within a List type.
+    var args = (0, _values.getArgumentValues)(fieldDef, fieldNodes[0], exeContext.variableValues); // The resolve function's optional third argument is a context value that
+    // is provided to every resolve function within an execution. It is commonly
+    // used to represent an authenticated user, or request-specific caches.
+
+    var _contextValue = exeContext.contextValue;
+    var result = resolveFn(source, args, _contextValue, info);
+    return (0, _isPromise.default)(result) ? result.then(undefined, asErrorInstance) : result;
+  } catch (error) {
+    return asErrorInstance(error);
+  }
+} // Sometimes a non-error is thrown, wrap it as an Error instance to ensure a
+// consistent Error interface.
+
+
+function asErrorInstance(error) {
+  if (error instanceof Error) {
+    return error;
+  }
+
+  return new Error('Unexpected error value: ' + (0, _inspect.default)(error));
+} // This is a small wrapper around completeValue which detects and logs errors
+// in the execution context.
+
+
+function completeValueCatchingError(exeContext, returnType, fieldNodes, info, path, result) {
+  try {
+    var completed;
+
+    if ((0, _isPromise.default)(result)) {
+      completed = result.then(function (resolved) {
+        return completeValue(exeContext, returnType, fieldNodes, info, path, resolved);
+      });
+    } else {
+      completed = completeValue(exeContext, returnType, fieldNodes, info, path, result);
+    }
+
+    if ((0, _isPromise.default)(completed)) {
+      // Note: we don't rely on a `catch` method, but we do expect "thenable"
+      // to take a second callback for the error case.
+      return completed.then(undefined, function (error) {
+        return handleFieldError(error, fieldNodes, path, returnType, exeContext);
+      });
+    }
+
+    return completed;
+  } catch (error) {
+    return handleFieldError(error, fieldNodes, path, returnType, exeContext);
+  }
+}
+
+function handleFieldError(rawError, fieldNodes, path, returnType, exeContext) {
+  var error = (0, _locatedError.locatedError)(asErrorInstance(rawError), fieldNodes, responsePathAsArray(path)); // If the field type is non-nullable, then it is resolved without any
+  // protection from errors, however it still properly locates the error.
+
+  if ((0, _definition.isNonNullType)(returnType)) {
+    throw error;
+  } // Otherwise, error protection is applied, logging the error and resolving
+  // a null value for this field if one is encountered.
+
+
+  exeContext.errors.push(error);
+  return null;
+}
+/**
+ * Implements the instructions for completeValue as defined in the
+ * "Field entries" section of the spec.
+ *
+ * If the field type is Non-Null, then this recursively completes the value
+ * for the inner type. It throws a field error if that completion returns null,
+ * as per the "Nullability" section of the spec.
+ *
+ * If the field type is a List, then this recursively completes the value
+ * for the inner type on each item in the list.
+ *
+ * If the field type is a Scalar or Enum, ensures the completed value is a legal
+ * value of the type by calling the `serialize` method of GraphQL type
+ * definition.
+ *
+ * If the field is an abstract type, determine the runtime type of the value
+ * and then complete based on that type
+ *
+ * Otherwise, the field type expects a sub-selection set, and will complete the
+ * value by evaluating all sub-selections.
+ */
+
+
+function completeValue(exeContext, returnType, fieldNodes, info, path, result) {
+  // If result is an Error, throw a located error.
+  if (result instanceof Error) {
+    throw result;
+  } // If field type is NonNull, complete for inner type, and throw field error
+  // if result is null.
+
+
+  if ((0, _definition.isNonNullType)(returnType)) {
+    var completed = completeValue(exeContext, returnType.ofType, fieldNodes, info, path, result);
+
+    if (completed === null) {
+      throw new Error("Cannot return null for non-nullable field ".concat(info.parentType.name, ".").concat(info.fieldName, "."));
+    }
+
+    return completed;
+  } // If result value is null-ish (null, undefined, or NaN) then return null.
+
+
+  if ((0, _isNullish.default)(result)) {
+    return null;
+  } // If field type is List, complete each item in the list with the inner type
+
+
+  if ((0, _definition.isListType)(returnType)) {
+    return completeListValue(exeContext, returnType, fieldNodes, info, path, result);
+  } // If field type is a leaf type, Scalar or Enum, serialize to a valid value,
+  // returning null if serialization is not possible.
+
+
+  if ((0, _definition.isLeafType)(returnType)) {
+    return completeLeafValue(returnType, result);
+  } // If field type is an abstract type, Interface or Union, determine the
+  // runtime Object type and complete for that type.
+
+
+  if ((0, _definition.isAbstractType)(returnType)) {
+    return completeAbstractValue(exeContext, returnType, fieldNodes, info, path, result);
+  } // If field type is Object, execute and complete all sub-selections.
+
+
+  if ((0, _definition.isObjectType)(returnType)) {
+    return completeObjectValue(exeContext, returnType, fieldNodes, info, path, result);
+  } // Not reachable. All possible output types have been considered.
+
+  /* istanbul ignore next */
+
+
+  throw new Error("Cannot complete value of unexpected output type: \"".concat((0, _inspect.default)(returnType), "\"."));
+}
+/**
+ * Complete a list value by completing each item in the list with the
+ * inner type
+ */
+
+
+function completeListValue(exeContext, returnType, fieldNodes, info, path, result) {
+  !(0, _iterall.isCollection)(result) ? (0, _invariant.default)(0, "Expected Iterable, but did not find one for field ".concat(info.parentType.name, ".").concat(info.fieldName, ".")) : void 0; // This is specified as a simple map, however we're optimizing the path
+  // where the list contains no Promises by avoiding creating another Promise.
+
+  var itemType = returnType.ofType;
+  var containsPromise = false;
+  var completedResults = [];
+  (0, _iterall.forEach)(result, function (item, index) {
+    // No need to modify the info object containing the path,
+    // since from here on it is not ever accessed by resolver functions.
+    var fieldPath = addPath(path, index);
+    var completedItem = completeValueCatchingError(exeContext, itemType, fieldNodes, info, fieldPath, item);
+
+    if (!containsPromise && (0, _isPromise.default)(completedItem)) {
+      containsPromise = true;
+    }
+
+    completedResults.push(completedItem);
+  });
+  return containsPromise ? Promise.all(completedResults) : completedResults;
+}
+/**
+ * Complete a Scalar or Enum by serializing to a valid value, returning
+ * null if serialization is not possible.
+ */
+
+
+function completeLeafValue(returnType, result) {
+  !returnType.serialize ? (0, _invariant.default)(0, 'Missing serialize method on type') : void 0;
+  var serializedResult = returnType.serialize(result);
+
+  if ((0, _isInvalid.default)(serializedResult)) {
+    throw new Error("Expected a value of type \"".concat((0, _inspect.default)(returnType), "\" but ") + "received: ".concat((0, _inspect.default)(result)));
+  }
+
+  return serializedResult;
+}
+/**
+ * Complete a value of an abstract type by determining the runtime object type
+ * of that value, then complete the value for that type.
+ */
+
+
+function completeAbstractValue(exeContext, returnType, fieldNodes, info, path, result) {
+  var resolveTypeFn = returnType.resolveType || exeContext.typeResolver;
+  var contextValue = exeContext.contextValue;
+  var runtimeType = resolveTypeFn(result, contextValue, info, returnType);
+
+  if ((0, _isPromise.default)(runtimeType)) {
+    return runtimeType.then(function (resolvedRuntimeType) {
+      return completeObjectValue(exeContext, ensureValidRuntimeType(resolvedRuntimeType, exeContext, returnType, fieldNodes, info, result), fieldNodes, info, path, result);
+    });
+  }
+
+  return completeObjectValue(exeContext, ensureValidRuntimeType(runtimeType, exeContext, returnType, fieldNodes, info, result), fieldNodes, info, path, result);
+}
+
+function ensureValidRuntimeType(runtimeTypeOrName, exeContext, returnType, fieldNodes, info, result) {
+  var runtimeType = typeof runtimeTypeOrName === 'string' ? exeContext.schema.getType(runtimeTypeOrName) : runtimeTypeOrName;
+
+  if (!(0, _definition.isObjectType)(runtimeType)) {
+    throw new _GraphQLError.GraphQLError("Abstract type ".concat(returnType.name, " must resolve to an Object type at runtime for field ").concat(info.parentType.name, ".").concat(info.fieldName, " with ") + "value ".concat((0, _inspect.default)(result), ", received \"").concat((0, _inspect.default)(runtimeType), "\". ") + "Either the ".concat(returnType.name, " type should provide a \"resolveType\" function or each possible type should provide an \"isTypeOf\" function."), fieldNodes);
+  }
+
+  if (!exeContext.schema.isPossibleType(returnType, runtimeType)) {
+    throw new _GraphQLError.GraphQLError("Runtime Object type \"".concat(runtimeType.name, "\" is not a possible type for \"").concat(returnType.name, "\"."), fieldNodes);
+  }
+
+  return runtimeType;
+}
+/**
+ * Complete an Object value by executing all sub-selections.
+ */
+
+
+function completeObjectValue(exeContext, returnType, fieldNodes, info, path, result) {
+  // If there is an isTypeOf predicate function, call it with the
+  // current result. If isTypeOf returns false, then raise an error rather
+  // than continuing execution.
+  if (returnType.isTypeOf) {
+    var isTypeOf = returnType.isTypeOf(result, exeContext.contextValue, info);
+
+    if ((0, _isPromise.default)(isTypeOf)) {
+      return isTypeOf.then(function (resolvedIsTypeOf) {
+        if (!resolvedIsTypeOf) {
+          throw invalidReturnTypeError(returnType, result, fieldNodes);
+        }
+
+        return collectAndExecuteSubfields(exeContext, returnType, fieldNodes, path, result);
+      });
+    }
+
+    if (!isTypeOf) {
+      throw invalidReturnTypeError(returnType, result, fieldNodes);
+    }
+  }
+
+  return collectAndExecuteSubfields(exeContext, returnType, fieldNodes, path, result);
+}
+
+function invalidReturnTypeError(returnType, result, fieldNodes) {
+  return new _GraphQLError.GraphQLError("Expected value of type \"".concat(returnType.name, "\" but got: ").concat((0, _inspect.default)(result), "."), fieldNodes);
+}
+
+function collectAndExecuteSubfields(exeContext, returnType, fieldNodes, path, result) {
+  // Collect sub-fields to execute to complete this value.
+  var subFieldNodes = collectSubfields(exeContext, returnType, fieldNodes);
+  return executeFields(exeContext, returnType, result, path, subFieldNodes);
+}
+/**
+ * A memoized collection of relevant subfields with regard to the return
+ * type. Memoizing ensures the subfields are not repeatedly calculated, which
+ * saves overhead when resolving lists of values.
+ */
+
+
+var collectSubfields = (0, _memoize.default)(_collectSubfields);
+
+function _collectSubfields(exeContext, returnType, fieldNodes) {
+  var subFieldNodes = Object.create(null);
+  var visitedFragmentNames = Object.create(null);
+
+  for (var i = 0; i < fieldNodes.length; i++) {
+    var selectionSet = fieldNodes[i].selectionSet;
+
+    if (selectionSet) {
+      subFieldNodes = collectFields(exeContext, returnType, selectionSet, subFieldNodes, visitedFragmentNames);
+    }
+  }
+
+  return subFieldNodes;
+}
+/**
+ * If a resolveType function is not given, then a default resolve behavior is
+ * used which attempts two strategies:
+ *
+ * First, See if the provided value has a `__typename` field defined, if so, use
+ * that value as name of the resolved type.
+ *
+ * Otherwise, test each possible type for the abstract type by calling
+ * isTypeOf for the object being coerced, returning the first type that matches.
+ */
+
+
+var defaultTypeResolver = function defaultTypeResolver(value, contextValue, info, abstractType) {
+  // First, look for `__typename`.
+  if ((0, _isObjectLike.default)(value) && typeof value.__typename === 'string') {
+    return value.__typename;
+  } // Otherwise, test each possible type.
+
+
+  var possibleTypes = info.schema.getPossibleTypes(abstractType);
+  var promisedIsTypeOfResults = [];
+
+  for (var i = 0; i < possibleTypes.length; i++) {
+    var type = possibleTypes[i];
+
+    if (type.isTypeOf) {
+      var isTypeOfResult = type.isTypeOf(value, contextValue, info);
+
+      if ((0, _isPromise.default)(isTypeOfResult)) {
+        promisedIsTypeOfResults[i] = isTypeOfResult;
+      } else if (isTypeOfResult) {
+        return type;
+      }
+    }
+  }
+
+  if (promisedIsTypeOfResults.length) {
+    return Promise.all(promisedIsTypeOfResults).then(function (isTypeOfResults) {
+      for (var _i = 0; _i < isTypeOfResults.length; _i++) {
+        if (isTypeOfResults[_i]) {
+          return possibleTypes[_i];
+        }
+      }
+    });
+  }
+};
+/**
+ * If a resolve function is not given, then a default resolve behavior is used
+ * which takes the property of the source object of the same name as the field
+ * and returns it as the result, or if it's a function, returns the result
+ * of calling that function while passing along args and context value.
+ */
+
+
+exports.defaultTypeResolver = defaultTypeResolver;
+
+var defaultFieldResolver = function defaultFieldResolver(source, args, contextValue, info) {
+  // ensure source is a value for which property access is acceptable.
+  if ((0, _isObjectLike.default)(source) || typeof source === 'function') {
+    var property = source[info.fieldName];
+
+    if (typeof property === 'function') {
+      return source[info.fieldName](args, contextValue, info);
+    }
+
+    return property;
+  }
+};
+/**
+ * This method looks up the field on the given type definition.
+ * It has special casing for the two introspection fields, __schema
+ * and __typename. __typename is special because it can always be
+ * queried as a field, even in situations where no other fields
+ * are allowed, like on a Union. __schema could get automatically
+ * added to the query type, but that would require mutating type
+ * definitions, which would cause issues.
+ */
+
+
+exports.defaultFieldResolver = defaultFieldResolver;
+
+function getFieldDef(schema, parentType, fieldName) {
+  if (fieldName === _introspection.SchemaMetaFieldDef.name && schema.getQueryType() === parentType) {
+    return _introspection.SchemaMetaFieldDef;
+  } else if (fieldName === _introspection.TypeMetaFieldDef.name && schema.getQueryType() === parentType) {
+    return _introspection.TypeMetaFieldDef;
+  } else if (fieldName === _introspection.TypeNameMetaFieldDef.name) {
+    return _introspection.TypeNameMetaFieldDef;
+  }
+
+  return parentType.getFields()[fieldName];
+}

node_modules/graphql/execution/execute.mjs

@@ -0,0 +1,812 @@
+import { forEach, isCollection } from 'iterall';
+import { GraphQLError } from '../error/GraphQLError';
+import { locatedError } from '../error/locatedError';
+import inspect from '../jsutils/inspect';
+import invariant from '../jsutils/invariant';
+import isInvalid from '../jsutils/isInvalid';
+import isNullish from '../jsutils/isNullish';
+import isPromise from '../jsutils/isPromise';
+import isObjectLike from '../jsutils/isObjectLike';
+import memoize3 from '../jsutils/memoize3';
+import promiseForObject from '../jsutils/promiseForObject';
+import promiseReduce from '../jsutils/promiseReduce';
+import { getOperationRootType } from '../utilities/getOperationRootType';
+import { typeFromAST } from '../utilities/typeFromAST';
+import { Kind } from '../language/kinds';
+import { getVariableValues, getArgumentValues, getDirectiveValues } from './values';
+import { isObjectType, isAbstractType, isLeafType, isListType, isNonNullType } from '../type/definition';
+import { SchemaMetaFieldDef, TypeMetaFieldDef, TypeNameMetaFieldDef } from '../type/introspection';
+import { GraphQLIncludeDirective, GraphQLSkipDirective } from '../type/directives';
+import { assertValidSchema } from '../type/validate';
+export function execute(argsOrSchema, document, rootValue, contextValue, variableValues, operationName, fieldResolver, typeResolver) {
+  /* eslint-enable no-redeclare */
+  // Extract arguments from object args if provided.
+  return arguments.length === 1 ? executeImpl(argsOrSchema) : executeImpl({
+    schema: argsOrSchema,
+    document: document,
+    rootValue: rootValue,
+    contextValue: contextValue,
+    variableValues: variableValues,
+    operationName: operationName,
+    fieldResolver: fieldResolver,
+    typeResolver: typeResolver
+  });
+}
+
+function executeImpl(args) {
+  var schema = args.schema,
+      document = args.document,
+      rootValue = args.rootValue,
+      contextValue = args.contextValue,
+      variableValues = args.variableValues,
+      operationName = args.operationName,
+      fieldResolver = args.fieldResolver,
+      typeResolver = args.typeResolver; // If arguments are missing or incorrect, throw an error.
+
+  assertValidExecutionArguments(schema, document, variableValues); // If a valid execution context cannot be created due to incorrect arguments,
+  // a "Response" with only errors is returned.
+
+  var exeContext = buildExecutionContext(schema, document, rootValue, contextValue, variableValues, operationName, fieldResolver, typeResolver); // Return early errors if execution context failed.
+
+  if (Array.isArray(exeContext)) {
+    return {
+      errors: exeContext
+    };
+  } // Return a Promise that will eventually resolve to the data described by
+  // The "Response" section of the GraphQL specification.
+  //
+  // If errors are encountered while executing a GraphQL field, only that
+  // field and its descendants will be omitted, and sibling fields will still
+  // be executed. An execution which encounters errors will still result in a
+  // resolved Promise.
+
+
+  var data = executeOperation(exeContext, exeContext.operation, rootValue);
+  return buildResponse(exeContext, data);
+}
+/**
+ * Given a completed execution context and data, build the { errors, data }
+ * response defined by the "Response" section of the GraphQL specification.
+ */
+
+
+function buildResponse(exeContext, data) {
+  if (isPromise(data)) {
+    return data.then(function (resolved) {
+      return buildResponse(exeContext, resolved);
+    });
+  }
+
+  return exeContext.errors.length === 0 ? {
+    data: data
+  } : {
+    errors: exeContext.errors,
+    data: data
+  };
+}
+/**
+ * Given a ResponsePath (found in the `path` entry in the information provided
+ * as the last argument to a field resolver), return an Array of the path keys.
+ */
+
+
+export function responsePathAsArray(path) {
+  var flattened = [];
+  var curr = path;
+
+  while (curr) {
+    flattened.push(curr.key);
+    curr = curr.prev;
+  }
+
+  return flattened.reverse();
+}
+/**
+ * Given a ResponsePath and a key, return a new ResponsePath containing the
+ * new key.
+ */
+
+export function addPath(prev, key) {
+  return {
+    prev: prev,
+    key: key
+  };
+}
+/**
+ * Essential assertions before executing to provide developer feedback for
+ * improper use of the GraphQL library.
+ */
+
+export function assertValidExecutionArguments(schema, document, rawVariableValues) {
+  !document ? invariant(0, 'Must provide document') : void 0; // If the schema used for execution is invalid, throw an error.
+
+  assertValidSchema(schema); // Variables, if provided, must be an object.
+
+  !(rawVariableValues == null || isObjectLike(rawVariableValues)) ? invariant(0, 'Variables must be provided as an Object where each property is a variable value. Perhaps look to see if an unparsed JSON string was provided.') : void 0;
+}
+/**
+ * Constructs a ExecutionContext object from the arguments passed to
+ * execute, which we will pass throughout the other execution methods.
+ *
+ * Throws a GraphQLError if a valid execution context cannot be created.
+ */
+
+export function buildExecutionContext(schema, document, rootValue, contextValue, rawVariableValues, operationName, fieldResolver, typeResolver) {
+  var errors = [];
+  var operation;
+  var hasMultipleAssumedOperations = false;
+  var fragments = Object.create(null);
+
+  for (var i = 0; i < document.definitions.length; i++) {
+    var definition = document.definitions[i];
+
+    switch (definition.kind) {
+      case Kind.OPERATION_DEFINITION:
+        if (!operationName && operation) {
+          hasMultipleAssumedOperations = true;
+        } else if (!operationName || definition.name && definition.name.value === operationName) {
+          operation = definition;
+        }
+
+        break;
+
+      case Kind.FRAGMENT_DEFINITION:
+        fragments[definition.name.value] = definition;
+        break;
+    }
+  }
+
+  if (!operation) {
+    if (operationName) {
+      errors.push(new GraphQLError("Unknown operation named \"".concat(operationName, "\".")));
+    } else {
+      errors.push(new GraphQLError('Must provide an operation.'));
+    }
+  } else if (hasMultipleAssumedOperations) {
+    errors.push(new GraphQLError('Must provide operation name if query contains multiple operations.'));
+  }
+
+  var variableValues;
+
+  if (operation) {
+    var coercedVariableValues = getVariableValues(schema, operation.variableDefinitions || [], rawVariableValues || {});
+
+    if (coercedVariableValues.errors) {
+      errors.push.apply(errors, coercedVariableValues.errors);
+    } else {
+      variableValues = coercedVariableValues.coerced;
+    }
+  }
+
+  if (errors.length !== 0) {
+    return errors;
+  }
+
+  !operation ? invariant(0, 'Has operation if no errors.') : void 0;
+  !variableValues ? invariant(0, 'Has variables if no errors.') : void 0;
+  return {
+    schema: schema,
+    fragments: fragments,
+    rootValue: rootValue,
+    contextValue: contextValue,
+    operation: operation,
+    variableValues: variableValues,
+    fieldResolver: fieldResolver || defaultFieldResolver,
+    typeResolver: typeResolver || defaultTypeResolver,
+    errors: errors
+  };
+}
+/**
+ * Implements the "Evaluating operations" section of the spec.
+ */
+
+function executeOperation(exeContext, operation, rootValue) {
+  var type = getOperationRootType(exeContext.schema, operation);
+  var fields = collectFields(exeContext, type, operation.selectionSet, Object.create(null), Object.create(null));
+  var path = undefined; // Errors from sub-fields of a NonNull type may propagate to the top level,
+  // at which point we still log the error and null the parent field, which
+  // in this case is the entire response.
+  //
+  // Similar to completeValueCatchingError.
+
+  try {
+    var result = operation.operation === 'mutation' ? executeFieldsSerially(exeContext, type, rootValue, path, fields) : executeFields(exeContext, type, rootValue, path, fields);
+
+    if (isPromise(result)) {
+      return result.then(undefined, function (error) {
+        exeContext.errors.push(error);
+        return Promise.resolve(null);
+      });
+    }
+
+    return result;
+  } catch (error) {
+    exeContext.errors.push(error);
+    return null;
+  }
+}
+/**
+ * Implements the "Evaluating selection sets" section of the spec
+ * for "write" mode.
+ */
+
+
+function executeFieldsSerially(exeContext, parentType, sourceValue, path, fields) {
+  return promiseReduce(Object.keys(fields), function (results, responseName) {
+    var fieldNodes = fields[responseName];
+    var fieldPath = addPath(path, responseName);
+    var result = resolveField(exeContext, parentType, sourceValue, fieldNodes, fieldPath);
+
+    if (result === undefined) {
+      return results;
+    }
+
+    if (isPromise(result)) {
+      return result.then(function (resolvedResult) {
+        results[responseName] = resolvedResult;
+        return results;
+      });
+    }
+
+    results[responseName] = result;
+    return results;
+  }, Object.create(null));
+}
+/**
+ * Implements the "Evaluating selection sets" section of the spec
+ * for "read" mode.
+ */
+
+
+function executeFields(exeContext, parentType, sourceValue, path, fields) {
+  var results = Object.create(null);
+  var containsPromise = false;
+
+  for (var i = 0, keys = Object.keys(fields); i < keys.length; ++i) {
+    var responseName = keys[i];
+    var fieldNodes = fields[responseName];
+    var fieldPath = addPath(path, responseName);
+    var result = resolveField(exeContext, parentType, sourceValue, fieldNodes, fieldPath);
+
+    if (result !== undefined) {
+      results[responseName] = result;
+
+      if (!containsPromise && isPromise(result)) {
+        containsPromise = true;
+      }
+    }
+  } // If there are no promises, we can just return the object
+
+
+  if (!containsPromise) {
+    return results;
+  } // Otherwise, results is a map from field name to the result of resolving that
+  // field, which is possibly a promise. Return a promise that will return this
+  // same map, but with any promises replaced with the values they resolved to.
+
+
+  return promiseForObject(results);
+}
+/**
+ * Given a selectionSet, adds all of the fields in that selection to
+ * the passed in map of fields, and returns it at the end.
+ *
+ * CollectFields requires the "runtime type" of an object. For a field which
+ * returns an Interface or Union type, the "runtime type" will be the actual
+ * Object type returned by that field.
+ */
+
+
+export function collectFields(exeContext, runtimeType, selectionSet, fields, visitedFragmentNames) {
+  for (var i = 0; i < selectionSet.selections.length; i++) {
+    var selection = selectionSet.selections[i];
+
+    switch (selection.kind) {
+      case Kind.FIELD:
+        {
+          if (!shouldIncludeNode(exeContext, selection)) {
+            continue;
+          }
+
+          var name = getFieldEntryKey(selection);
+
+          if (!fields[name]) {
+            fields[name] = [];
+          }
+
+          fields[name].push(selection);
+          break;
+        }
+
+      case Kind.INLINE_FRAGMENT:
+        {
+          if (!shouldIncludeNode(exeContext, selection) || !doesFragmentConditionMatch(exeContext, selection, runtimeType)) {
+            continue;
+          }
+
+          collectFields(exeContext, runtimeType, selection.selectionSet, fields, visitedFragmentNames);
+          break;
+        }
+
+      case Kind.FRAGMENT_SPREAD:
+        {
+          var fragName = selection.name.value;
+
+          if (visitedFragmentNames[fragName] || !shouldIncludeNode(exeContext, selection)) {
+            continue;
+          }
+
+          visitedFragmentNames[fragName] = true;
+          var fragment = exeContext.fragments[fragName];
+
+          if (!fragment || !doesFragmentConditionMatch(exeContext, fragment, runtimeType)) {
+            continue;
+          }
+
+          collectFields(exeContext, runtimeType, fragment.selectionSet, fields, visitedFragmentNames);
+          break;
+        }
+    }
+  }
+
+  return fields;
+}
+/**
+ * Determines if a field should be included based on the @include and @skip
+ * directives, where @skip has higher precedence than @include.
+ */
+
+function shouldIncludeNode(exeContext, node) {
+  var skip = getDirectiveValues(GraphQLSkipDirective, node, exeContext.variableValues);
+
+  if (skip && skip.if === true) {
+    return false;
+  }
+
+  var include = getDirectiveValues(GraphQLIncludeDirective, node, exeContext.variableValues);
+
+  if (include && include.if === false) {
+    return false;
+  }
+
+  return true;
+}
+/**
+ * Determines if a fragment is applicable to the given type.
+ */
+
+
+function doesFragmentConditionMatch(exeContext, fragment, type) {
+  var typeConditionNode = fragment.typeCondition;
+
+  if (!typeConditionNode) {
+    return true;
+  }
+
+  var conditionalType = typeFromAST(exeContext.schema, typeConditionNode);
+
+  if (conditionalType === type) {
+    return true;
+  }
+
+  if (isAbstractType(conditionalType)) {
+    return exeContext.schema.isPossibleType(conditionalType, type);
+  }
+
+  return false;
+}
+/**
+ * Implements the logic to compute the key of a given field's entry
+ */
+
+
+function getFieldEntryKey(node) {
+  return node.alias ? node.alias.value : node.name.value;
+}
+/**
+ * Resolves the field on the given source object. In particular, this
+ * figures out the value that the field returns by calling its resolve function,
+ * then calls completeValue to complete promises, serialize scalars, or execute
+ * the sub-selection-set for objects.
+ */
+
+
+function resolveField(exeContext, parentType, source, fieldNodes, path) {
+  var fieldNode = fieldNodes[0];
+  var fieldName = fieldNode.name.value;
+  var fieldDef = getFieldDef(exeContext.schema, parentType, fieldName);
+
+  if (!fieldDef) {
+    return;
+  }
+
+  var resolveFn = fieldDef.resolve || exeContext.fieldResolver;
+  var info = buildResolveInfo(exeContext, fieldDef, fieldNodes, parentType, path); // Get the resolve function, regardless of if its result is normal
+  // or abrupt (error).
+
+  var result = resolveFieldValueOrError(exeContext, fieldDef, fieldNodes, resolveFn, source, info);
+  return completeValueCatchingError(exeContext, fieldDef.type, fieldNodes, info, path, result);
+}
+
+export function buildResolveInfo(exeContext, fieldDef, fieldNodes, parentType, path) {
+  // The resolve function's optional fourth argument is a collection of
+  // information about the current execution state.
+  return {
+    fieldName: fieldDef.name,
+    fieldNodes: fieldNodes,
+    returnType: fieldDef.type,
+    parentType: parentType,
+    path: path,
+    schema: exeContext.schema,
+    fragments: exeContext.fragments,
+    rootValue: exeContext.rootValue,
+    operation: exeContext.operation,
+    variableValues: exeContext.variableValues
+  };
+} // Isolates the "ReturnOrAbrupt" behavior to not de-opt the `resolveField`
+// function. Returns the result of resolveFn or the abrupt-return Error object.
+
+export function resolveFieldValueOrError(exeContext, fieldDef, fieldNodes, resolveFn, source, info) {
+  try {
+    // Build a JS object of arguments from the field.arguments AST, using the
+    // variables scope to fulfill any variable references.
+    // TODO: find a way to memoize, in case this field is within a List type.
+    var args = getArgumentValues(fieldDef, fieldNodes[0], exeContext.variableValues); // The resolve function's optional third argument is a context value that
+    // is provided to every resolve function within an execution. It is commonly
+    // used to represent an authenticated user, or request-specific caches.
+
+    var _contextValue = exeContext.contextValue;
+    var result = resolveFn(source, args, _contextValue, info);
+    return isPromise(result) ? result.then(undefined, asErrorInstance) : result;
+  } catch (error) {
+    return asErrorInstance(error);
+  }
+} // Sometimes a non-error is thrown, wrap it as an Error instance to ensure a
+// consistent Error interface.
+
+function asErrorInstance(error) {
+  if (error instanceof Error) {
+    return error;
+  }
+
+  return new Error('Unexpected error value: ' + inspect(error));
+} // This is a small wrapper around completeValue which detects and logs errors
+// in the execution context.
+
+
+function completeValueCatchingError(exeContext, returnType, fieldNodes, info, path, result) {
+  try {
+    var completed;
+
+    if (isPromise(result)) {
+      completed = result.then(function (resolved) {
+        return completeValue(exeContext, returnType, fieldNodes, info, path, resolved);
+      });
+    } else {
+      completed = completeValue(exeContext, returnType, fieldNodes, info, path, result);
+    }
+
+    if (isPromise(completed)) {
+      // Note: we don't rely on a `catch` method, but we do expect "thenable"
+      // to take a second callback for the error case.
+      return completed.then(undefined, function (error) {
+        return handleFieldError(error, fieldNodes, path, returnType, exeContext);
+      });
+    }
+
+    return completed;
+  } catch (error) {
+    return handleFieldError(error, fieldNodes, path, returnType, exeContext);
+  }
+}
+
+function handleFieldError(rawError, fieldNodes, path, returnType, exeContext) {
+  var error = locatedError(asErrorInstance(rawError), fieldNodes, responsePathAsArray(path)); // If the field type is non-nullable, then it is resolved without any
+  // protection from errors, however it still properly locates the error.
+
+  if (isNonNullType(returnType)) {
+    throw error;
+  } // Otherwise, error protection is applied, logging the error and resolving
+  // a null value for this field if one is encountered.
+
+
+  exeContext.errors.push(error);
+  return null;
+}
+/**
+ * Implements the instructions for completeValue as defined in the
+ * "Field entries" section of the spec.
+ *
+ * If the field type is Non-Null, then this recursively completes the value
+ * for the inner type. It throws a field error if that completion returns null,
+ * as per the "Nullability" section of the spec.
+ *
+ * If the field type is a List, then this recursively completes the value
+ * for the inner type on each item in the list.
+ *
+ * If the field type is a Scalar or Enum, ensures the completed value is a legal
+ * value of the type by calling the `serialize` method of GraphQL type
+ * definition.
+ *
+ * If the field is an abstract type, determine the runtime type of the value
+ * and then complete based on that type
+ *
+ * Otherwise, the field type expects a sub-selection set, and will complete the
+ * value by evaluating all sub-selections.
+ */
+
+
+function completeValue(exeContext, returnType, fieldNodes, info, path, result) {
+  // If result is an Error, throw a located error.
+  if (result instanceof Error) {
+    throw result;
+  } // If field type is NonNull, complete for inner type, and throw field error
+  // if result is null.
+
+
+  if (isNonNullType(returnType)) {
+    var completed = completeValue(exeContext, returnType.ofType, fieldNodes, info, path, result);
+
+    if (completed === null) {
+      throw new Error("Cannot return null for non-nullable field ".concat(info.parentType.name, ".").concat(info.fieldName, "."));
+    }
+
+    return completed;
+  } // If result value is null-ish (null, undefined, or NaN) then return null.
+
+
+  if (isNullish(result)) {
+    return null;
+  } // If field type is List, complete each item in the list with the inner type
+
+
+  if (isListType(returnType)) {
+    return completeListValue(exeContext, returnType, fieldNodes, info, path, result);
+  } // If field type is a leaf type, Scalar or Enum, serialize to a valid value,
+  // returning null if serialization is not possible.
+
+
+  if (isLeafType(returnType)) {
+    return completeLeafValue(returnType, result);
+  } // If field type is an abstract type, Interface or Union, determine the
+  // runtime Object type and complete for that type.
+
+
+  if (isAbstractType(returnType)) {
+    return completeAbstractValue(exeContext, returnType, fieldNodes, info, path, result);
+  } // If field type is Object, execute and complete all sub-selections.
+
+
+  if (isObjectType(returnType)) {
+    return completeObjectValue(exeContext, returnType, fieldNodes, info, path, result);
+  } // Not reachable. All possible output types have been considered.
+
+  /* istanbul ignore next */
+
+
+  throw new Error("Cannot complete value of unexpected output type: \"".concat(inspect(returnType), "\"."));
+}
+/**
+ * Complete a list value by completing each item in the list with the
+ * inner type
+ */
+
+
+function completeListValue(exeContext, returnType, fieldNodes, info, path, result) {
+  !isCollection(result) ? invariant(0, "Expected Iterable, but did not find one for field ".concat(info.parentType.name, ".").concat(info.fieldName, ".")) : void 0; // This is specified as a simple map, however we're optimizing the path
+  // where the list contains no Promises by avoiding creating another Promise.
+
+  var itemType = returnType.ofType;
+  var containsPromise = false;
+  var completedResults = [];
+  forEach(result, function (item, index) {
+    // No need to modify the info object containing the path,
+    // since from here on it is not ever accessed by resolver functions.
+    var fieldPath = addPath(path, index);
+    var completedItem = completeValueCatchingError(exeContext, itemType, fieldNodes, info, fieldPath, item);
+
+    if (!containsPromise && isPromise(completedItem)) {
+      containsPromise = true;
+    }
+
+    completedResults.push(completedItem);
+  });
+  return containsPromise ? Promise.all(completedResults) : completedResults;
+}
+/**
+ * Complete a Scalar or Enum by serializing to a valid value, returning
+ * null if serialization is not possible.
+ */
+
+
+function completeLeafValue(returnType, result) {
+  !returnType.serialize ? invariant(0, 'Missing serialize method on type') : void 0;
+  var serializedResult = returnType.serialize(result);
+
+  if (isInvalid(serializedResult)) {
+    throw new Error("Expected a value of type \"".concat(inspect(returnType), "\" but ") + "received: ".concat(inspect(result)));
+  }
+
+  return serializedResult;
+}
+/**
+ * Complete a value of an abstract type by determining the runtime object type
+ * of that value, then complete the value for that type.
+ */
+
+
+function completeAbstractValue(exeContext, returnType, fieldNodes, info, path, result) {
+  var resolveTypeFn = returnType.resolveType || exeContext.typeResolver;
+  var contextValue = exeContext.contextValue;
+  var runtimeType = resolveTypeFn(result, contextValue, info, returnType);
+
+  if (isPromise(runtimeType)) {
+    return runtimeType.then(function (resolvedRuntimeType) {
+      return completeObjectValue(exeContext, ensureValidRuntimeType(resolvedRuntimeType, exeContext, returnType, fieldNodes, info, result), fieldNodes, info, path, result);
+    });
+  }
+
+  return completeObjectValue(exeContext, ensureValidRuntimeType(runtimeType, exeContext, returnType, fieldNodes, info, result), fieldNodes, info, path, result);
+}
+
+function ensureValidRuntimeType(runtimeTypeOrName, exeContext, returnType, fieldNodes, info, result) {
+  var runtimeType = typeof runtimeTypeOrName === 'string' ? exeContext.schema.getType(runtimeTypeOrName) : runtimeTypeOrName;
+
+  if (!isObjectType(runtimeType)) {
+    throw new GraphQLError("Abstract type ".concat(returnType.name, " must resolve to an Object type at runtime for field ").concat(info.parentType.name, ".").concat(info.fieldName, " with ") + "value ".concat(inspect(result), ", received \"").concat(inspect(runtimeType), "\". ") + "Either the ".concat(returnType.name, " type should provide a \"resolveType\" function or each possible type should provide an \"isTypeOf\" function."), fieldNodes);
+  }
+
+  if (!exeContext.schema.isPossibleType(returnType, runtimeType)) {
+    throw new GraphQLError("Runtime Object type \"".concat(runtimeType.name, "\" is not a possible type for \"").concat(returnType.name, "\"."), fieldNodes);
+  }
+
+  return runtimeType;
+}
+/**
+ * Complete an Object value by executing all sub-selections.
+ */
+
+
+function completeObjectValue(exeContext, returnType, fieldNodes, info, path, result) {
+  // If there is an isTypeOf predicate function, call it with the
+  // current result. If isTypeOf returns false, then raise an error rather
+  // than continuing execution.
+  if (returnType.isTypeOf) {
+    var isTypeOf = returnType.isTypeOf(result, exeContext.contextValue, info);
+
+    if (isPromise(isTypeOf)) {
+      return isTypeOf.then(function (resolvedIsTypeOf) {
+        if (!resolvedIsTypeOf) {
+          throw invalidReturnTypeError(returnType, result, fieldNodes);
+        }
+
+        return collectAndExecuteSubfields(exeContext, returnType, fieldNodes, path, result);
+      });
+    }
+
+    if (!isTypeOf) {
+      throw invalidReturnTypeError(returnType, result, fieldNodes);
+    }
+  }
+
+  return collectAndExecuteSubfields(exeContext, returnType, fieldNodes, path, result);
+}
+
+function invalidReturnTypeError(returnType, result, fieldNodes) {
+  return new GraphQLError("Expected value of type \"".concat(returnType.name, "\" but got: ").concat(inspect(result), "."), fieldNodes);
+}
+
+function collectAndExecuteSubfields(exeContext, returnType, fieldNodes, path, result) {
+  // Collect sub-fields to execute to complete this value.
+  var subFieldNodes = collectSubfields(exeContext, returnType, fieldNodes);
+  return executeFields(exeContext, returnType, result, path, subFieldNodes);
+}
+/**
+ * A memoized collection of relevant subfields with regard to the return
+ * type. Memoizing ensures the subfields are not repeatedly calculated, which
+ * saves overhead when resolving lists of values.
+ */
+
+
+var collectSubfields = memoize3(_collectSubfields);
+
+function _collectSubfields(exeContext, returnType, fieldNodes) {
+  var subFieldNodes = Object.create(null);
+  var visitedFragmentNames = Object.create(null);
+
+  for (var i = 0; i < fieldNodes.length; i++) {
+    var selectionSet = fieldNodes[i].selectionSet;
+
+    if (selectionSet) {
+      subFieldNodes = collectFields(exeContext, returnType, selectionSet, subFieldNodes, visitedFragmentNames);
+    }
+  }
+
+  return subFieldNodes;
+}
+/**
+ * If a resolveType function is not given, then a default resolve behavior is
+ * used which attempts two strategies:
+ *
+ * First, See if the provided value has a `__typename` field defined, if so, use
+ * that value as name of the resolved type.
+ *
+ * Otherwise, test each possible type for the abstract type by calling
+ * isTypeOf for the object being coerced, returning the first type that matches.
+ */
+
+
+export var defaultTypeResolver = function defaultTypeResolver(value, contextValue, info, abstractType) {
+  // First, look for `__typename`.
+  if (isObjectLike(value) && typeof value.__typename === 'string') {
+    return value.__typename;
+  } // Otherwise, test each possible type.
+
+
+  var possibleTypes = info.schema.getPossibleTypes(abstractType);
+  var promisedIsTypeOfResults = [];
+
+  for (var i = 0; i < possibleTypes.length; i++) {
+    var type = possibleTypes[i];
+
+    if (type.isTypeOf) {
+      var isTypeOfResult = type.isTypeOf(value, contextValue, info);
+
+      if (isPromise(isTypeOfResult)) {
+        promisedIsTypeOfResults[i] = isTypeOfResult;
+      } else if (isTypeOfResult) {
+        return type;
+      }
+    }
+  }
+
+  if (promisedIsTypeOfResults.length) {
+    return Promise.all(promisedIsTypeOfResults).then(function (isTypeOfResults) {
+      for (var _i = 0; _i < isTypeOfResults.length; _i++) {
+        if (isTypeOfResults[_i]) {
+          return possibleTypes[_i];
+        }
+      }
+    });
+  }
+};
+/**
+ * If a resolve function is not given, then a default resolve behavior is used
+ * which takes the property of the source object of the same name as the field
+ * and returns it as the result, or if it's a function, returns the result
+ * of calling that function while passing along args and context value.
+ */
+
+export var defaultFieldResolver = function defaultFieldResolver(source, args, contextValue, info) {
+  // ensure source is a value for which property access is acceptable.
+  if (isObjectLike(source) || typeof source === 'function') {
+    var property = source[info.fieldName];
+
+    if (typeof property === 'function') {
+      return source[info.fieldName](args, contextValue, info);
+    }
+
+    return property;
+  }
+};
+/**
+ * This method looks up the field on the given type definition.
+ * It has special casing for the two introspection fields, __schema
+ * and __typename. __typename is special because it can always be
+ * queried as a field, even in situations where no other fields
+ * are allowed, like on a Union. __schema could get automatically
+ * added to the query type, but that would require mutating type
+ * definitions, which would cause issues.
+ */
+
+export function getFieldDef(schema, parentType, fieldName) {
+  if (fieldName === SchemaMetaFieldDef.name && schema.getQueryType() === parentType) {
+    return SchemaMetaFieldDef;
+  } else if (fieldName === TypeMetaFieldDef.name && schema.getQueryType() === parentType) {
+    return TypeMetaFieldDef;
+  } else if (fieldName === TypeNameMetaFieldDef.name) {
+    return TypeNameMetaFieldDef;
+  }
+
+  return parentType.getFields()[fieldName];
+}

node_modules/graphql/execution/index.js

@@ -0,0 +1,39 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "execute", {
+  enumerable: true,
+  get: function get() {
+    return _execute.execute;
+  }
+});
+Object.defineProperty(exports, "defaultFieldResolver", {
+  enumerable: true,
+  get: function get() {
+    return _execute.defaultFieldResolver;
+  }
+});
+Object.defineProperty(exports, "defaultTypeResolver", {
+  enumerable: true,
+  get: function get() {
+    return _execute.defaultTypeResolver;
+  }
+});
+Object.defineProperty(exports, "responsePathAsArray", {
+  enumerable: true,
+  get: function get() {
+    return _execute.responsePathAsArray;
+  }
+});
+Object.defineProperty(exports, "getDirectiveValues", {
+  enumerable: true,
+  get: function get() {
+    return _values.getDirectiveValues;
+  }
+});
+
+var _execute = require("./execute");
+
+var _values = require("./values");

node_modules/graphql/execution/index.js.flow

@@ -0,0 +1,11 @@
+// @flow strict
+
+export {
+  execute,
+  defaultFieldResolver,
+  defaultTypeResolver,
+  responsePathAsArray,
+} from './execute';
+export type { ExecutionArgs, ExecutionResult } from './execute';
+
+export { getDirectiveValues } from './values';

node_modules/graphql/execution/index.mjs

@@ -0,0 +1,2 @@
+export { execute, defaultFieldResolver, defaultTypeResolver, responsePathAsArray } from './execute';
+export { getDirectiveValues } from './values';

node_modules/graphql/execution/values.js

@@ -0,0 +1,231 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getVariableValues = getVariableValues;
+exports.getArgumentValues = getArgumentValues;
+exports.getDirectiveValues = getDirectiveValues;
+
+var _find = _interopRequireDefault(require("../polyfills/find"));
+
+var _GraphQLError = require("../error/GraphQLError");
+
+var _inspect = _interopRequireDefault(require("../jsutils/inspect"));
+
+var _invariant = _interopRequireDefault(require("../jsutils/invariant"));
+
+var _keyMap = _interopRequireDefault(require("../jsutils/keyMap"));
+
+var _coerceValue = require("../utilities/coerceValue");
+
+var _typeFromAST = require("../utilities/typeFromAST");
+
+var _valueFromAST = require("../utilities/valueFromAST");
+
+var _kinds = require("../language/kinds");
+
+var _printer = require("../language/printer");
+
+var _definition = require("../type/definition");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Prepares an object map of variableValues of the correct type based on the
+ * provided variable definitions and arbitrary input. If the input cannot be
+ * parsed to match the variable definitions, a GraphQLError will be thrown.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+function getVariableValues(schema, varDefNodes, inputs) {
+  var errors = [];
+  var coercedValues = {};
+
+  for (var i = 0; i < varDefNodes.length; i++) {
+    var varDefNode = varDefNodes[i];
+    var varName = varDefNode.variable.name.value;
+    var varType = (0, _typeFromAST.typeFromAST)(schema, varDefNode.type);
+
+    if (!(0, _definition.isInputType)(varType)) {
+      // Must use input types for variables. This should be caught during
+      // validation, however is checked again here for safety.
+      errors.push(new _GraphQLError.GraphQLError("Variable \"$".concat(varName, "\" expected value of type ") + "\"".concat((0, _printer.print)(varDefNode.type), "\" which cannot be used as an input type."), varDefNode.type));
+    } else {
+      var hasValue = hasOwnProperty(inputs, varName);
+      var value = hasValue ? inputs[varName] : undefined;
+
+      if (!hasValue && varDefNode.defaultValue) {
+        // If no value was provided to a variable with a default value,
+        // use the default value.
+        coercedValues[varName] = (0, _valueFromAST.valueFromAST)(varDefNode.defaultValue, varType);
+      } else if ((!hasValue || value === null) && (0, _definition.isNonNullType)(varType)) {
+        // If no value or a nullish value was provided to a variable with a
+        // non-null type (required), produce an error.
+        errors.push(new _GraphQLError.GraphQLError(hasValue ? "Variable \"$".concat(varName, "\" of non-null type ") + "\"".concat((0, _inspect.default)(varType), "\" must not be null.") : "Variable \"$".concat(varName, "\" of required type ") + "\"".concat((0, _inspect.default)(varType), "\" was not provided."), varDefNode));
+      } else if (hasValue) {
+        if (value === null) {
+          // If the explicit value `null` was provided, an entry in the coerced
+          // values must exist as the value `null`.
+          coercedValues[varName] = null;
+        } else {
+          // Otherwise, a non-null value was provided, coerce it to the expected
+          // type or report an error if coercion fails.
+          var coerced = (0, _coerceValue.coerceValue)(value, varType, varDefNode);
+          var coercionErrors = coerced.errors;
+
+          if (coercionErrors) {
+            var _iteratorNormalCompletion = true;
+            var _didIteratorError = false;
+            var _iteratorError = undefined;
+
+            try {
+              for (var _iterator = coercionErrors[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+                var error = _step.value;
+                error.message = "Variable \"$".concat(varName, "\" got invalid value ").concat((0, _inspect.default)(value), "; ") + error.message;
+              }
+            } catch (err) {
+              _didIteratorError = true;
+              _iteratorError = err;
+            } finally {
+              try {
+                if (!_iteratorNormalCompletion && _iterator.return != null) {
+                  _iterator.return();
+                }
+              } finally {
+                if (_didIteratorError) {
+                  throw _iteratorError;
+                }
+              }
+            }
+
+            errors.push.apply(errors, coercionErrors);
+          } else {
+            coercedValues[varName] = coerced.value;
+          }
+        }
+      }
+    }
+  }
+
+  return errors.length === 0 ? {
+    errors: undefined,
+    coerced: coercedValues
+  } : {
+    errors: errors,
+    coerced: undefined
+  };
+}
+/**
+ * Prepares an object map of argument values given a list of argument
+ * definitions and list of argument AST nodes.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+
+
+function getArgumentValues(def, node, variableValues) {
+  var coercedValues = {};
+  var argDefs = def.args;
+  var argNodes = node.arguments;
+
+  if (!argDefs || !argNodes) {
+    return coercedValues;
+  }
+
+  var argNodeMap = (0, _keyMap.default)(argNodes, function (arg) {
+    return arg.name.value;
+  });
+
+  for (var i = 0; i < argDefs.length; i++) {
+    var argDef = argDefs[i];
+    var name = argDef.name;
+    var argType = argDef.type;
+    var argumentNode = argNodeMap[name];
+    var hasValue = void 0;
+    var isNull = void 0;
+
+    if (argumentNode && argumentNode.value.kind === _kinds.Kind.VARIABLE) {
+      var variableName = argumentNode.value.name.value;
+      hasValue = variableValues != null && hasOwnProperty(variableValues, variableName);
+      isNull = variableValues != null && variableValues[variableName] === null;
+    } else {
+      hasValue = argumentNode != null;
+      isNull = argumentNode != null && argumentNode.value.kind === _kinds.Kind.NULL;
+    }
+
+    if (!hasValue && argDef.defaultValue !== undefined) {
+      // If no argument was provided where the definition has a default value,
+      // use the default value.
+      coercedValues[name] = argDef.defaultValue;
+    } else if ((!hasValue || isNull) && (0, _definition.isNonNullType)(argType)) {
+      // If no argument or a null value was provided to an argument with a
+      // non-null type (required), produce a field error.
+      if (isNull) {
+        throw new _GraphQLError.GraphQLError("Argument \"".concat(name, "\" of non-null type \"").concat((0, _inspect.default)(argType), "\" ") + 'must not be null.', argumentNode.value);
+      } else if (argumentNode && argumentNode.value.kind === _kinds.Kind.VARIABLE) {
+        var _variableName = argumentNode.value.name.value;
+        throw new _GraphQLError.GraphQLError("Argument \"".concat(name, "\" of required type \"").concat((0, _inspect.default)(argType), "\" ") + "was provided the variable \"$".concat(_variableName, "\" which was not provided a runtime value."), argumentNode.value);
+      } else {
+        throw new _GraphQLError.GraphQLError("Argument \"".concat(name, "\" of required type \"").concat((0, _inspect.default)(argType), "\" ") + 'was not provided.', node);
+      }
+    } else if (hasValue) {
+      if (argumentNode.value.kind === _kinds.Kind.NULL) {
+        // If the explicit value `null` was provided, an entry in the coerced
+        // values must exist as the value `null`.
+        coercedValues[name] = null;
+      } else if (argumentNode.value.kind === _kinds.Kind.VARIABLE) {
+        var _variableName2 = argumentNode.value.name.value;
+        !variableValues ? (0, _invariant.default)(0, 'Must exist for hasValue to be true.') : void 0; // Note: This does no further checking that this variable is correct.
+        // This assumes that this query has been validated and the variable
+        // usage here is of the correct type.
+
+        coercedValues[name] = variableValues[_variableName2];
+      } else {
+        var valueNode = argumentNode.value;
+        var coercedValue = (0, _valueFromAST.valueFromAST)(valueNode, argType, variableValues);
+
+        if (coercedValue === undefined) {
+          // Note: ValuesOfCorrectType validation should catch this before
+          // execution. This is a runtime check to ensure execution does not
+          // continue with an invalid argument value.
+          throw new _GraphQLError.GraphQLError("Argument \"".concat(name, "\" has invalid value ").concat((0, _printer.print)(valueNode), "."), argumentNode.value);
+        }
+
+        coercedValues[name] = coercedValue;
+      }
+    }
+  }
+
+  return coercedValues;
+}
+/**
+ * Prepares an object map of argument values given a directive definition
+ * and a AST node which may contain directives. Optionally also accepts a map
+ * of variable values.
+ *
+ * If the directive does not exist on the node, returns undefined.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+
+
+function getDirectiveValues(directiveDef, node, variableValues) {
+  var directiveNode = node.directives && (0, _find.default)(node.directives, function (directive) {
+    return directive.name.value === directiveDef.name;
+  });
+
+  if (directiveNode) {
+    return getArgumentValues(directiveDef, directiveNode, variableValues);
+  }
+}
+
+function hasOwnProperty(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}

node_modules/graphql/execution/values.js.flow

@@ -0,0 +1,238 @@
+// @flow strict
+
+import find from '../polyfills/find';
+import { GraphQLError } from '../error/GraphQLError';
+import inspect from '../jsutils/inspect';
+import invariant from '../jsutils/invariant';
+import keyMap from '../jsutils/keyMap';
+import { coerceValue } from '../utilities/coerceValue';
+import { typeFromAST } from '../utilities/typeFromAST';
+import { valueFromAST } from '../utilities/valueFromAST';
+import { Kind } from '../language/kinds';
+import { print } from '../language/printer';
+import {
+  type GraphQLField,
+  isInputType,
+  isNonNullType,
+} from '../type/definition';
+import { type GraphQLDirective } from '../type/directives';
+import { type ObjMap } from '../jsutils/ObjMap';
+import { type GraphQLSchema } from '../type/schema';
+import {
+  type FieldNode,
+  type DirectiveNode,
+  type VariableDefinitionNode,
+} from '../language/ast';
+
+type CoercedVariableValues = {|
+  errors: $ReadOnlyArray<GraphQLError> | void,
+  coerced: { [variable: string]: mixed, ... } | void,
+|};
+
+/**
+ * Prepares an object map of variableValues of the correct type based on the
+ * provided variable definitions and arbitrary input. If the input cannot be
+ * parsed to match the variable definitions, a GraphQLError will be thrown.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+export function getVariableValues(
+  schema: GraphQLSchema,
+  varDefNodes: $ReadOnlyArray<VariableDefinitionNode>,
+  inputs: { +[variable: string]: mixed, ... },
+): CoercedVariableValues {
+  const errors = [];
+  const coercedValues = {};
+  for (let i = 0; i < varDefNodes.length; i++) {
+    const varDefNode = varDefNodes[i];
+    const varName = varDefNode.variable.name.value;
+    const varType = typeFromAST(schema, varDefNode.type);
+    if (!isInputType(varType)) {
+      // Must use input types for variables. This should be caught during
+      // validation, however is checked again here for safety.
+      errors.push(
+        new GraphQLError(
+          `Variable "$${varName}" expected value of type ` +
+            `"${print(
+              varDefNode.type,
+            )}" which cannot be used as an input type.`,
+          varDefNode.type,
+        ),
+      );
+    } else {
+      const hasValue = hasOwnProperty(inputs, varName);
+      const value = hasValue ? inputs[varName] : undefined;
+      if (!hasValue && varDefNode.defaultValue) {
+        // If no value was provided to a variable with a default value,
+        // use the default value.
+        coercedValues[varName] = valueFromAST(varDefNode.defaultValue, varType);
+      } else if ((!hasValue || value === null) && isNonNullType(varType)) {
+        // If no value or a nullish value was provided to a variable with a
+        // non-null type (required), produce an error.
+        errors.push(
+          new GraphQLError(
+            hasValue
+              ? `Variable "$${varName}" of non-null type ` +
+                `"${inspect(varType)}" must not be null.`
+              : `Variable "$${varName}" of required type ` +
+                `"${inspect(varType)}" was not provided.`,
+            varDefNode,
+          ),
+        );
+      } else if (hasValue) {
+        if (value === null) {
+          // If the explicit value `null` was provided, an entry in the coerced
+          // values must exist as the value `null`.
+          coercedValues[varName] = null;
+        } else {
+          // Otherwise, a non-null value was provided, coerce it to the expected
+          // type or report an error if coercion fails.
+          const coerced = coerceValue(value, varType, varDefNode);
+          const coercionErrors = coerced.errors;
+          if (coercionErrors) {
+            for (const error of coercionErrors) {
+              error.message =
+                `Variable "$${varName}" got invalid value ${inspect(value)}; ` +
+                error.message;
+            }
+            errors.push(...coercionErrors);
+          } else {
+            coercedValues[varName] = coerced.value;
+          }
+        }
+      }
+    }
+  }
+  return errors.length === 0
+    ? { errors: undefined, coerced: coercedValues }
+    : { errors, coerced: undefined };
+}
+
+/**
+ * Prepares an object map of argument values given a list of argument
+ * definitions and list of argument AST nodes.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+export function getArgumentValues(
+  def: GraphQLField<*, *> | GraphQLDirective,
+  node: FieldNode | DirectiveNode,
+  variableValues?: ?ObjMap<mixed>,
+): { [argument: string]: mixed, ... } {
+  const coercedValues = {};
+  const argDefs = def.args;
+  const argNodes = node.arguments;
+  if (!argDefs || !argNodes) {
+    return coercedValues;
+  }
+  const argNodeMap = keyMap(argNodes, arg => arg.name.value);
+  for (let i = 0; i < argDefs.length; i++) {
+    const argDef = argDefs[i];
+    const name = argDef.name;
+    const argType = argDef.type;
+    const argumentNode = argNodeMap[name];
+    let hasValue;
+    let isNull;
+    if (argumentNode && argumentNode.value.kind === Kind.VARIABLE) {
+      const variableName = argumentNode.value.name.value;
+      hasValue =
+        variableValues != null && hasOwnProperty(variableValues, variableName);
+      isNull = variableValues != null && variableValues[variableName] === null;
+    } else {
+      hasValue = argumentNode != null;
+      isNull = argumentNode != null && argumentNode.value.kind === Kind.NULL;
+    }
+
+    if (!hasValue && argDef.defaultValue !== undefined) {
+      // If no argument was provided where the definition has a default value,
+      // use the default value.
+      coercedValues[name] = argDef.defaultValue;
+    } else if ((!hasValue || isNull) && isNonNullType(argType)) {
+      // If no argument or a null value was provided to an argument with a
+      // non-null type (required), produce a field error.
+      if (isNull) {
+        throw new GraphQLError(
+          `Argument "${name}" of non-null type "${inspect(argType)}" ` +
+            'must not be null.',
+          argumentNode.value,
+        );
+      } else if (argumentNode && argumentNode.value.kind === Kind.VARIABLE) {
+        const variableName = argumentNode.value.name.value;
+        throw new GraphQLError(
+          `Argument "${name}" of required type "${inspect(argType)}" ` +
+            `was provided the variable "$${variableName}" which was not provided a runtime value.`,
+          argumentNode.value,
+        );
+      } else {
+        throw new GraphQLError(
+          `Argument "${name}" of required type "${inspect(argType)}" ` +
+            'was not provided.',
+          node,
+        );
+      }
+    } else if (hasValue) {
+      if (argumentNode.value.kind === Kind.NULL) {
+        // If the explicit value `null` was provided, an entry in the coerced
+        // values must exist as the value `null`.
+        coercedValues[name] = null;
+      } else if (argumentNode.value.kind === Kind.VARIABLE) {
+        const variableName = argumentNode.value.name.value;
+        invariant(variableValues, 'Must exist for hasValue to be true.');
+        // Note: This does no further checking that this variable is correct.
+        // This assumes that this query has been validated and the variable
+        // usage here is of the correct type.
+        coercedValues[name] = variableValues[variableName];
+      } else {
+        const valueNode = argumentNode.value;
+        const coercedValue = valueFromAST(valueNode, argType, variableValues);
+        if (coercedValue === undefined) {
+          // Note: ValuesOfCorrectType validation should catch this before
+          // execution. This is a runtime check to ensure execution does not
+          // continue with an invalid argument value.
+          throw new GraphQLError(
+            `Argument "${name}" has invalid value ${print(valueNode)}.`,
+            argumentNode.value,
+          );
+        }
+        coercedValues[name] = coercedValue;
+      }
+    }
+  }
+  return coercedValues;
+}
+
+/**
+ * Prepares an object map of argument values given a directive definition
+ * and a AST node which may contain directives. Optionally also accepts a map
+ * of variable values.
+ *
+ * If the directive does not exist on the node, returns undefined.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+export function getDirectiveValues(
+  directiveDef: GraphQLDirective,
+  node: { +directives?: $ReadOnlyArray<DirectiveNode>, ... },
+  variableValues?: ?ObjMap<mixed>,
+): void | { [argument: string]: mixed, ... } {
+  const directiveNode =
+    node.directives &&
+    find(
+      node.directives,
+      directive => directive.name.value === directiveDef.name,
+    );
+
+  if (directiveNode) {
+    return getArgumentValues(directiveDef, directiveNode, variableValues);
+  }
+}
+
+function hasOwnProperty(obj: mixed, prop: string): boolean {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}

node_modules/graphql/execution/values.mjs

@@ -0,0 +1,208 @@
+import find from '../polyfills/find';
+import { GraphQLError } from '../error/GraphQLError';
+import inspect from '../jsutils/inspect';
+import invariant from '../jsutils/invariant';
+import keyMap from '../jsutils/keyMap';
+import { coerceValue } from '../utilities/coerceValue';
+import { typeFromAST } from '../utilities/typeFromAST';
+import { valueFromAST } from '../utilities/valueFromAST';
+import { Kind } from '../language/kinds';
+import { print } from '../language/printer';
+import { isInputType, isNonNullType } from '../type/definition';
+
+/**
+ * Prepares an object map of variableValues of the correct type based on the
+ * provided variable definitions and arbitrary input. If the input cannot be
+ * parsed to match the variable definitions, a GraphQLError will be thrown.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+export function getVariableValues(schema, varDefNodes, inputs) {
+  var errors = [];
+  var coercedValues = {};
+
+  for (var i = 0; i < varDefNodes.length; i++) {
+    var varDefNode = varDefNodes[i];
+    var varName = varDefNode.variable.name.value;
+    var varType = typeFromAST(schema, varDefNode.type);
+
+    if (!isInputType(varType)) {
+      // Must use input types for variables. This should be caught during
+      // validation, however is checked again here for safety.
+      errors.push(new GraphQLError("Variable \"$".concat(varName, "\" expected value of type ") + "\"".concat(print(varDefNode.type), "\" which cannot be used as an input type."), varDefNode.type));
+    } else {
+      var hasValue = hasOwnProperty(inputs, varName);
+      var value = hasValue ? inputs[varName] : undefined;
+
+      if (!hasValue && varDefNode.defaultValue) {
+        // If no value was provided to a variable with a default value,
+        // use the default value.
+        coercedValues[varName] = valueFromAST(varDefNode.defaultValue, varType);
+      } else if ((!hasValue || value === null) && isNonNullType(varType)) {
+        // If no value or a nullish value was provided to a variable with a
+        // non-null type (required), produce an error.
+        errors.push(new GraphQLError(hasValue ? "Variable \"$".concat(varName, "\" of non-null type ") + "\"".concat(inspect(varType), "\" must not be null.") : "Variable \"$".concat(varName, "\" of required type ") + "\"".concat(inspect(varType), "\" was not provided."), varDefNode));
+      } else if (hasValue) {
+        if (value === null) {
+          // If the explicit value `null` was provided, an entry in the coerced
+          // values must exist as the value `null`.
+          coercedValues[varName] = null;
+        } else {
+          // Otherwise, a non-null value was provided, coerce it to the expected
+          // type or report an error if coercion fails.
+          var coerced = coerceValue(value, varType, varDefNode);
+          var coercionErrors = coerced.errors;
+
+          if (coercionErrors) {
+            var _iteratorNormalCompletion = true;
+            var _didIteratorError = false;
+            var _iteratorError = undefined;
+
+            try {
+              for (var _iterator = coercionErrors[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+                var error = _step.value;
+                error.message = "Variable \"$".concat(varName, "\" got invalid value ").concat(inspect(value), "; ") + error.message;
+              }
+            } catch (err) {
+              _didIteratorError = true;
+              _iteratorError = err;
+            } finally {
+              try {
+                if (!_iteratorNormalCompletion && _iterator.return != null) {
+                  _iterator.return();
+                }
+              } finally {
+                if (_didIteratorError) {
+                  throw _iteratorError;
+                }
+              }
+            }
+
+            errors.push.apply(errors, coercionErrors);
+          } else {
+            coercedValues[varName] = coerced.value;
+          }
+        }
+      }
+    }
+  }
+
+  return errors.length === 0 ? {
+    errors: undefined,
+    coerced: coercedValues
+  } : {
+    errors: errors,
+    coerced: undefined
+  };
+}
+/**
+ * Prepares an object map of argument values given a list of argument
+ * definitions and list of argument AST nodes.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+
+export function getArgumentValues(def, node, variableValues) {
+  var coercedValues = {};
+  var argDefs = def.args;
+  var argNodes = node.arguments;
+
+  if (!argDefs || !argNodes) {
+    return coercedValues;
+  }
+
+  var argNodeMap = keyMap(argNodes, function (arg) {
+    return arg.name.value;
+  });
+
+  for (var i = 0; i < argDefs.length; i++) {
+    var argDef = argDefs[i];
+    var name = argDef.name;
+    var argType = argDef.type;
+    var argumentNode = argNodeMap[name];
+    var hasValue = void 0;
+    var isNull = void 0;
+
+    if (argumentNode && argumentNode.value.kind === Kind.VARIABLE) {
+      var variableName = argumentNode.value.name.value;
+      hasValue = variableValues != null && hasOwnProperty(variableValues, variableName);
+      isNull = variableValues != null && variableValues[variableName] === null;
+    } else {
+      hasValue = argumentNode != null;
+      isNull = argumentNode != null && argumentNode.value.kind === Kind.NULL;
+    }
+
+    if (!hasValue && argDef.defaultValue !== undefined) {
+      // If no argument was provided where the definition has a default value,
+      // use the default value.
+      coercedValues[name] = argDef.defaultValue;
+    } else if ((!hasValue || isNull) && isNonNullType(argType)) {
+      // If no argument or a null value was provided to an argument with a
+      // non-null type (required), produce a field error.
+      if (isNull) {
+        throw new GraphQLError("Argument \"".concat(name, "\" of non-null type \"").concat(inspect(argType), "\" ") + 'must not be null.', argumentNode.value);
+      } else if (argumentNode && argumentNode.value.kind === Kind.VARIABLE) {
+        var _variableName = argumentNode.value.name.value;
+        throw new GraphQLError("Argument \"".concat(name, "\" of required type \"").concat(inspect(argType), "\" ") + "was provided the variable \"$".concat(_variableName, "\" which was not provided a runtime value."), argumentNode.value);
+      } else {
+        throw new GraphQLError("Argument \"".concat(name, "\" of required type \"").concat(inspect(argType), "\" ") + 'was not provided.', node);
+      }
+    } else if (hasValue) {
+      if (argumentNode.value.kind === Kind.NULL) {
+        // If the explicit value `null` was provided, an entry in the coerced
+        // values must exist as the value `null`.
+        coercedValues[name] = null;
+      } else if (argumentNode.value.kind === Kind.VARIABLE) {
+        var _variableName2 = argumentNode.value.name.value;
+        !variableValues ? invariant(0, 'Must exist for hasValue to be true.') : void 0; // Note: This does no further checking that this variable is correct.
+        // This assumes that this query has been validated and the variable
+        // usage here is of the correct type.
+
+        coercedValues[name] = variableValues[_variableName2];
+      } else {
+        var valueNode = argumentNode.value;
+        var coercedValue = valueFromAST(valueNode, argType, variableValues);
+
+        if (coercedValue === undefined) {
+          // Note: ValuesOfCorrectType validation should catch this before
+          // execution. This is a runtime check to ensure execution does not
+          // continue with an invalid argument value.
+          throw new GraphQLError("Argument \"".concat(name, "\" has invalid value ").concat(print(valueNode), "."), argumentNode.value);
+        }
+
+        coercedValues[name] = coercedValue;
+      }
+    }
+  }
+
+  return coercedValues;
+}
+/**
+ * Prepares an object map of argument values given a directive definition
+ * and a AST node which may contain directives. Optionally also accepts a map
+ * of variable values.
+ *
+ * If the directive does not exist on the node, returns undefined.
+ *
+ * Note: The returned value is a plain Object with a prototype, since it is
+ * exposed to user code. Care should be taken to not pull values from the
+ * Object prototype.
+ */
+
+export function getDirectiveValues(directiveDef, node, variableValues) {
+  var directiveNode = node.directives && find(node.directives, function (directive) {
+    return directive.name.value === directiveDef.name;
+  });
+
+  if (directiveNode) {
+    return getArgumentValues(directiveDef, directiveNode, variableValues);
+  }
+}
+
+function hasOwnProperty(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}