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isObjectLike from '../jsutils/isObjectLike';\nimport { getLocation } from '../language/location';\nimport { printLocation, printSourceLocation } from '../language/printLocation';\n/**\n * A GraphQLError describes an Error found during the parse, validate, or\n * execute phases of performing a GraphQL operation. In addition to a message\n * and stack trace, it also includes information about the locations in a\n * GraphQL document and/or execution result that correspond to the Error.\n */\n\nexport function GraphQLError( // eslint-disable-line no-redeclare\nmessage, nodes, source, positions, path, originalError, extensions) {\n  // Compute list of blame nodes.\n  var _nodes = Array.isArray(nodes) ? nodes.length !== 0 ? nodes : undefined : nodes ? [nodes] : undefined; // Compute locations in the source for the given nodes/positions.\n\n\n  var _source = source;\n\n  if (!_source && _nodes) {\n    var node = _nodes[0];\n    _source = node && node.loc && node.loc.source;\n  }\n\n  var _positions = positions;\n\n  if (!_positions && _nodes) {\n    _positions = _nodes.reduce(function (list, node) {\n      if (node.loc) {\n        list.push(node.loc.start);\n      }\n\n      return list;\n    }, []);\n  }\n\n  if (_positions && _positions.length === 0) {\n    _positions = undefined;\n  }\n\n  var _locations;\n\n  if (positions && source) {\n    _locations = positions.map(function (pos) {\n      return getLocation(source, pos);\n    });\n  } else if (_nodes) {\n    _locations = _nodes.reduce(function (list, node) {\n      if (node.loc) {\n        list.push(getLocation(node.loc.source, node.loc.start));\n      }\n\n      return list;\n    }, []);\n  }\n\n  var _extensions = extensions;\n\n  if (_extensions == null && originalError != null) {\n    var originalExtensions = originalError.extensions;\n\n    if (isObjectLike(originalExtensions)) {\n      _extensions = originalExtensions;\n    }\n  }\n\n  Object.defineProperties(this, {\n    message: {\n      value: message,\n      // By being enumerable, JSON.stringify will include `message` in the\n      // resulting output. This ensures that the simplest possible GraphQL\n      // service adheres to the spec.\n      enumerable: true,\n      writable: true\n    },\n    locations: {\n      // Coercing falsey values to undefined ensures they will not be included\n      // in JSON.stringify() when not provided.\n      value: _locations || undefined,\n      // By being enumerable, JSON.stringify will include `locations` in the\n      // resulting output. This ensures that the simplest possible GraphQL\n      // service adheres to the spec.\n      enumerable: Boolean(_locations)\n    },\n    path: {\n      // Coercing falsey values to undefined ensures they will not be included\n      // in JSON.stringify() when not provided.\n      value: path || undefined,\n      // By being enumerable, JSON.stringify will include `path` in the\n      // resulting output. This ensures that the simplest possible GraphQL\n      // service adheres to the spec.\n      enumerable: Boolean(path)\n    },\n    nodes: {\n      value: _nodes || undefined\n    },\n    source: {\n      value: _source || undefined\n    },\n    positions: {\n      value: _positions || undefined\n    },\n    originalError: {\n      value: originalError\n    },\n    extensions: {\n      // Coercing falsey values to undefined ensures they will not be included\n      // in JSON.stringify() when not provided.\n      value: _extensions || undefined,\n      // By being enumerable, JSON.stringify will include `path` in the\n      // resulting output. This ensures that the simplest possible GraphQL\n      // service adheres to the spec.\n      enumerable: Boolean(_extensions)\n    }\n  }); // Include (non-enumerable) stack trace.\n\n  if (originalError && originalError.stack) {\n    Object.defineProperty(this, 'stack', {\n      value: originalError.stack,\n      writable: true,\n      configurable: true\n    });\n  } else if (Error.captureStackTrace) {\n    Error.captureStackTrace(this, GraphQLError);\n  } else {\n    Object.defineProperty(this, 'stack', {\n      value: Error().stack,\n      writable: true,\n      configurable: true\n    });\n  }\n}\nGraphQLError.prototype = Object.create(Error.prototype, {\n  constructor: {\n    value: GraphQLError\n  },\n  name: {\n    value: 'GraphQLError'\n  },\n  toString: {\n    value: function toString() {\n      return printError(this);\n    }\n  }\n});\n/**\n * Prints a GraphQLError to a string, representing useful location information\n * about the error's position in the source.\n */\n\nexport function printError(error) {\n  var output = error.message;\n\n  if (error.nodes) {\n    for (var _i2 = 0, _error$nodes2 = error.nodes; _i2 < _error$nodes2.length; _i2++) {\n      var node = _error$nodes2[_i2];\n\n      if (node.loc) {\n        output += '\\n\\n' + printLocation(node.loc);\n      }\n    }\n  } else if (error.source && error.locations) {\n    for (var _i4 = 0, _error$locations2 = error.locations; _i4 < _error$locations2.length; _i4++) {\n      var location = _error$locations2[_i4];\n      output += '\\n\\n' + printSourceLocation(error.source, location);\n    }\n  }\n\n  return output;\n}\n","import { GraphQLError } from './GraphQLError';\n/**\n * Produces a GraphQLError representing a syntax error, containing useful\n * descriptive information about the syntax error's position in the source.\n */\n\nexport function syntaxError(source, position, description) {\n  return new GraphQLError(\"Syntax Error: \".concat(description), undefined, source, [position]);\n}\n","import nodejsCustomInspectSymbol from './nodejsCustomInspectSymbol';\n/**\n * The `defineToJSON()` function defines toJSON() and inspect() prototype\n * methods, if no function provided they become aliases for toString().\n */\n\nexport default function defineToJSON(classObject) {\n  var fn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : classObject.prototype.toString;\n  classObject.prototype.toJSON = fn;\n  classObject.prototype.inspect = fn;\n\n  if (nodejsCustomInspectSymbol) {\n    classObject.prototype[nodejsCustomInspectSymbol] = fn;\n  }\n}\n","/**\n * The `defineToStringTag()` function checks first to see if the runtime\n * supports the `Symbol` class and then if the `Symbol.toStringTag` constant\n * is defined as a `Symbol` instance. If both conditions are met, the\n * Symbol.toStringTag property is defined as a getter that returns the\n * supplied class constructor's name.\n *\n * @method defineToStringTag\n *\n * @param {Class<any>} classObject a class such as Object, String, Number but\n * typically one of your own creation through the class keyword; `class A {}`,\n * for example.\n */\nexport default function defineToStringTag(classObject) {\n  if (typeof Symbol === 'function' && Symbol.toStringTag) {\n    Object.defineProperty(classObject.prototype, Symbol.toStringTag, {\n      get: function get() {\n        return this.constructor.name;\n      }\n    });\n  }\n}\n","export default function devAssert(condition, message) {\n  var booleanCondition = Boolean(condition);\n\n  if (!booleanCondition) {\n    throw new Error(message);\n  }\n}\n","function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nimport nodejsCustomInspectSymbol from './nodejsCustomInspectSymbol';\nvar MAX_ARRAY_LENGTH = 10;\nvar MAX_RECURSIVE_DEPTH = 2;\n/**\n * Used to print values in error messages.\n */\n\nexport default function inspect(value) {\n  return formatValue(value, []);\n}\n\nfunction formatValue(value, seenValues) {\n  switch (_typeof(value)) {\n    case 'string':\n      return JSON.stringify(value);\n\n    case 'function':\n      return value.name ? \"[function \".concat(value.name, \"]\") : '[function]';\n\n    case 'object':\n      if (value === null) {\n        return 'null';\n      }\n\n      return formatObjectValue(value, seenValues);\n\n    default:\n      return String(value);\n  }\n}\n\nfunction formatObjectValue(value, previouslySeenValues) {\n  if (previouslySeenValues.indexOf(value) !== -1) {\n    return '[Circular]';\n  }\n\n  var seenValues = [].concat(previouslySeenValues, [value]);\n  var customInspectFn = getCustomFn(value);\n\n  if (customInspectFn !== undefined) {\n    // $FlowFixMe(>=0.90.0)\n    var customValue = customInspectFn.call(value); // check for infinite recursion\n\n    if (customValue !== value) {\n      return typeof customValue === 'string' ? customValue : formatValue(customValue, seenValues);\n    }\n  } else if (Array.isArray(value)) {\n    return formatArray(value, seenValues);\n  }\n\n  return formatObject(value, seenValues);\n}\n\nfunction formatObject(object, seenValues) {\n  var keys = Object.keys(object);\n\n  if (keys.length === 0) {\n    return '{}';\n  }\n\n  if (seenValues.length > MAX_RECURSIVE_DEPTH) {\n    return '[' + getObjectTag(object) + ']';\n  }\n\n  var properties = keys.map(function (key) {\n    var value = formatValue(object[key], seenValues);\n    return key + ': ' + value;\n  });\n  return '{ ' + properties.join(', ') + ' }';\n}\n\nfunction formatArray(array, seenValues) {\n  if (array.length === 0) {\n    return '[]';\n  }\n\n  if (seenValues.length > MAX_RECURSIVE_DEPTH) {\n    return '[Array]';\n  }\n\n  var len = Math.min(MAX_ARRAY_LENGTH, array.length);\n  var remaining = array.length - len;\n  var items = [];\n\n  for (var i = 0; i < len; ++i) {\n    items.push(formatValue(array[i], seenValues));\n  }\n\n  if (remaining === 1) {\n    items.push('... 1 more item');\n  } else if (remaining > 1) {\n    items.push(\"... \".concat(remaining, \" more items\"));\n  }\n\n  return '[' + items.join(', ') + ']';\n}\n\nfunction getCustomFn(object) {\n  var customInspectFn = object[String(nodejsCustomInspectSymbol)];\n\n  if (typeof customInspectFn === 'function') {\n    return customInspectFn;\n  }\n\n  if (typeof object.inspect === 'function') {\n    return object.inspect;\n  }\n}\n\nfunction getObjectTag(object) {\n  var tag = Object.prototype.toString.call(object).replace(/^\\[object /, '').replace(/]$/, '');\n\n  if (tag === 'Object' && typeof object.constructor === 'function') {\n    var name = object.constructor.name;\n\n    if (typeof name === 'string' && name !== '') {\n      return name;\n    }\n  }\n\n  return tag;\n}\n","function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\n/**\n * Return true if `value` is object-like. A value is object-like if it's not\n * `null` and has a `typeof` result of \"object\".\n */\nexport default function isObjectLike(value) {\n  return _typeof(value) == 'object' && value !== null;\n}\n","var nodejsCustomInspectSymbol = typeof Symbol === 'function' && typeof Symbol.for === 'function' ? Symbol.for('nodejs.util.inspect.custom') : undefined;\nexport default nodejsCustomInspectSymbol;\n","/**\n * Produces the value of a block string from its parsed raw value, similar to\n * CoffeeScript's block string, Python's docstring trim or Ruby's strip_heredoc.\n *\n * This implements the GraphQL spec's BlockStringValue() static algorithm.\n */\nexport function dedentBlockStringValue(rawString) {\n  // Expand a block string's raw value into independent lines.\n  var lines = rawString.split(/\\r\\n|[\\n\\r]/g); // Remove common indentation from all lines but first.\n\n  var commonIndent = getBlockStringIndentation(lines);\n\n  if (commonIndent !== 0) {\n    for (var i = 1; i < lines.length; i++) {\n      lines[i] = lines[i].slice(commonIndent);\n    }\n  } // Remove leading and trailing blank lines.\n\n\n  while (lines.length > 0 && isBlank(lines[0])) {\n    lines.shift();\n  }\n\n  while (lines.length > 0 && isBlank(lines[lines.length - 1])) {\n    lines.pop();\n  } // Return a string of the lines joined with U+000A.\n\n\n  return lines.join('\\n');\n} // @internal\n\nexport function getBlockStringIndentation(lines) {\n  var commonIndent = null;\n\n  for (var i = 1; i < lines.length; i++) {\n    var line = lines[i];\n    var indent = leadingWhitespace(line);\n\n    if (indent === line.length) {\n      continue; // skip empty lines\n    }\n\n    if (commonIndent === null || indent < commonIndent) {\n      commonIndent = indent;\n\n      if (commonIndent === 0) {\n        break;\n      }\n    }\n  }\n\n  return commonIndent === null ? 0 : commonIndent;\n}\n\nfunction leadingWhitespace(str) {\n  var i = 0;\n\n  while (i < str.length && (str[i] === ' ' || str[i] === '\\t')) {\n    i++;\n  }\n\n  return i;\n}\n\nfunction isBlank(str) {\n  return leadingWhitespace(str) === str.length;\n}\n/**\n * Print a block string in the indented block form by adding a leading and\n * trailing blank line. However, if a block string starts with whitespace and is\n * a single-line, adding a leading blank line would strip that whitespace.\n */\n\n\nexport function printBlockString(value) {\n  var indentation = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';\n  var preferMultipleLines = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;\n  var isSingleLine = value.indexOf('\\n') === -1;\n  var hasLeadingSpace = value[0] === ' ' || value[0] === '\\t';\n  var hasTrailingQuote = value[value.length - 1] === '\"';\n  var printAsMultipleLines = !isSingleLine || hasTrailingQuote || preferMultipleLines;\n  var result = ''; // Format a multi-line block quote to account for leading space.\n\n  if (printAsMultipleLines && !(isSingleLine && hasLeadingSpace)) {\n    result += '\\n' + indentation;\n  }\n\n  result += indentation ? value.replace(/\\n/g, '\\n' + indentation) : value;\n\n  if (printAsMultipleLines) {\n    result += '\\n';\n  }\n\n  return '\"\"\"' + result.replace(/\"\"\"/g, '\\\\\"\"\"') + '\"\"\"';\n}\n","/**\n * The set of allowed directive location values.\n */\nexport var DirectiveLocation = Object.freeze({\n  // Request Definitions\n  QUERY: 'QUERY',\n  MUTATION: 'MUTATION',\n  SUBSCRIPTION: 'SUBSCRIPTION',\n  FIELD: 'FIELD',\n  FRAGMENT_DEFINITION: 'FRAGMENT_DEFINITION',\n  FRAGMENT_SPREAD: 'FRAGMENT_SPREAD',\n  INLINE_FRAGMENT: 'INLINE_FRAGMENT',\n  VARIABLE_DEFINITION: 'VARIABLE_DEFINITION',\n  // Type System Definitions\n  SCHEMA: 'SCHEMA',\n  SCALAR: 'SCALAR',\n  OBJECT: 'OBJECT',\n  FIELD_DEFINITION: 'FIELD_DEFINITION',\n  ARGUMENT_DEFINITION: 'ARGUMENT_DEFINITION',\n  INTERFACE: 'INTERFACE',\n  UNION: 'UNION',\n  ENUM: 'ENUM',\n  ENUM_VALUE: 'ENUM_VALUE',\n  INPUT_OBJECT: 'INPUT_OBJECT',\n  INPUT_FIELD_DEFINITION: 'INPUT_FIELD_DEFINITION'\n});\n/**\n * The enum type representing the directive location values.\n */\n","/**\n * The set of allowed kind values for AST nodes.\n */\nexport var Kind = Object.freeze({\n  // Name\n  NAME: 'Name',\n  // Document\n  DOCUMENT: 'Document',\n  OPERATION_DEFINITION: 'OperationDefinition',\n  VARIABLE_DEFINITION: 'VariableDefinition',\n  SELECTION_SET: 'SelectionSet',\n  FIELD: 'Field',\n  ARGUMENT: 'Argument',\n  // Fragments\n  FRAGMENT_SPREAD: 'FragmentSpread',\n  INLINE_FRAGMENT: 'InlineFragment',\n  FRAGMENT_DEFINITION: 'FragmentDefinition',\n  // Values\n  VARIABLE: 'Variable',\n  INT: 'IntValue',\n  FLOAT: 'FloatValue',\n  STRING: 'StringValue',\n  BOOLEAN: 'BooleanValue',\n  NULL: 'NullValue',\n  ENUM: 'EnumValue',\n  LIST: 'ListValue',\n  OBJECT: 'ObjectValue',\n  OBJECT_FIELD: 'ObjectField',\n  // Directives\n  DIRECTIVE: 'Directive',\n  // Types\n  NAMED_TYPE: 'NamedType',\n  LIST_TYPE: 'ListType',\n  NON_NULL_TYPE: 'NonNullType',\n  // Type System Definitions\n  SCHEMA_DEFINITION: 'SchemaDefinition',\n  OPERATION_TYPE_DEFINITION: 'OperationTypeDefinition',\n  // Type Definitions\n  SCALAR_TYPE_DEFINITION: 'ScalarTypeDefinition',\n  OBJECT_TYPE_DEFINITION: 'ObjectTypeDefinition',\n  FIELD_DEFINITION: 'FieldDefinition',\n  INPUT_VALUE_DEFINITION: 'InputValueDefinition',\n  INTERFACE_TYPE_DEFINITION: 'InterfaceTypeDefinition',\n  UNION_TYPE_DEFINITION: 'UnionTypeDefinition',\n  ENUM_TYPE_DEFINITION: 'EnumTypeDefinition',\n  ENUM_VALUE_DEFINITION: 'EnumValueDefinition',\n  INPUT_OBJECT_TYPE_DEFINITION: 'InputObjectTypeDefinition',\n  // Directive Definitions\n  DIRECTIVE_DEFINITION: 'DirectiveDefinition',\n  // Type System Extensions\n  SCHEMA_EXTENSION: 'SchemaExtension',\n  // Type Extensions\n  SCALAR_TYPE_EXTENSION: 'ScalarTypeExtension',\n  OBJECT_TYPE_EXTENSION: 'ObjectTypeExtension',\n  INTERFACE_TYPE_EXTENSION: 'InterfaceTypeExtension',\n  UNION_TYPE_EXTENSION: 'UnionTypeExtension',\n  ENUM_TYPE_EXTENSION: 'EnumTypeExtension',\n  INPUT_OBJECT_TYPE_EXTENSION: 'InputObjectTypeExtension'\n});\n/**\n * The enum type representing the possible kind values of AST nodes.\n */\n","import defineToJSON from '../jsutils/defineToJSON';\nimport { syntaxError } from '../error/syntaxError';\nimport { dedentBlockStringValue } from './blockString';\nimport { TokenKind } from './tokenKind';\n/**\n * Given a Source object, this returns a Lexer for that source.\n * A Lexer is a stateful stream generator in that every time\n * it is advanced, it returns the next token in the Source. Assuming the\n * source lexes, the final Token emitted by the lexer will be of kind\n * EOF, after which the lexer will repeatedly return the same EOF token\n * whenever called.\n */\n\nexport function createLexer(source, options) {\n  var startOfFileToken = new Tok(TokenKind.SOF, 0, 0, 0, 0, null);\n  var lexer = {\n    source: source,\n    options: options,\n    lastToken: startOfFileToken,\n    token: startOfFileToken,\n    line: 1,\n    lineStart: 0,\n    advance: advanceLexer,\n    lookahead: lookahead\n  };\n  return lexer;\n}\n\nfunction advanceLexer() {\n  this.lastToken = this.token;\n  var token = this.token = this.lookahead();\n  return token;\n}\n\nfunction lookahead() {\n  var token = this.token;\n\n  if (token.kind !== TokenKind.EOF) {\n    do {\n      // Note: next is only mutable during parsing, so we cast to allow this.\n      token = token.next || (token.next = readToken(this, token));\n    } while (token.kind === TokenKind.COMMENT);\n  }\n\n  return token;\n}\n/**\n * The return type of createLexer.\n */\n\n\n// @internal\nexport function isPunctuatorToken(token) {\n  var kind = token.kind;\n  return kind === TokenKind.BANG || kind === TokenKind.DOLLAR || kind === TokenKind.AMP || kind === TokenKind.PAREN_L || kind === TokenKind.PAREN_R || kind === TokenKind.SPREAD || kind === TokenKind.COLON || kind === TokenKind.EQUALS || kind === TokenKind.AT || kind === TokenKind.BRACKET_L || kind === TokenKind.BRACKET_R || kind === TokenKind.BRACE_L || kind === TokenKind.PIPE || kind === TokenKind.BRACE_R;\n}\n/**\n * Helper function for constructing the Token object.\n */\n\nfunction Tok(kind, start, end, line, column, prev, value) {\n  this.kind = kind;\n  this.start = start;\n  this.end = end;\n  this.line = line;\n  this.column = column;\n  this.value = value;\n  this.prev = prev;\n  this.next = null;\n} // Print a simplified form when appearing in JSON/util.inspect.\n\n\ndefineToJSON(Tok, function () {\n  return {\n    kind: this.kind,\n    value: this.value,\n    line: this.line,\n    column: this.column\n  };\n});\n\nfunction printCharCode(code) {\n  return (// NaN/undefined represents access beyond the end of the file.\n    isNaN(code) ? TokenKind.EOF : // Trust JSON for ASCII.\n    code < 0x007f ? JSON.stringify(String.fromCharCode(code)) : // Otherwise print the escaped form.\n    \"\\\"\\\\u\".concat(('00' + code.toString(16).toUpperCase()).slice(-4), \"\\\"\")\n  );\n}\n/**\n * Gets the next token from the source starting at the given position.\n *\n * This skips over whitespace until it finds the next lexable token, then lexes\n * punctuators immediately or calls the appropriate helper function for more\n * complicated tokens.\n */\n\n\nfunction readToken(lexer, prev) {\n  var source = lexer.source;\n  var body = source.body;\n  var bodyLength = body.length;\n  var pos = positionAfterWhitespace(body, prev.end, lexer);\n  var line = lexer.line;\n  var col = 1 + pos - lexer.lineStart;\n\n  if (pos >= bodyLength) {\n    return new Tok(TokenKind.EOF, bodyLength, bodyLength, line, col, prev);\n  }\n\n  var code = body.charCodeAt(pos); // SourceCharacter\n\n  switch (code) {\n    // !\n    case 33:\n      return new Tok(TokenKind.BANG, pos, pos + 1, line, col, prev);\n    // #\n\n    case 35:\n      return readComment(source, pos, line, col, prev);\n    // $\n\n    case 36:\n      return new Tok(TokenKind.DOLLAR, pos, pos + 1, line, col, prev);\n    // &\n\n    case 38:\n      return new Tok(TokenKind.AMP, pos, pos + 1, line, col, prev);\n    // (\n\n    case 40:\n      return new Tok(TokenKind.PAREN_L, pos, pos + 1, line, col, prev);\n    // )\n\n    case 41:\n      return new Tok(TokenKind.PAREN_R, pos, pos + 1, line, col, prev);\n    // .\n\n    case 46:\n      if (body.charCodeAt(pos + 1) === 46 && body.charCodeAt(pos + 2) === 46) {\n        return new Tok(TokenKind.SPREAD, pos, pos + 3, line, col, prev);\n      }\n\n      break;\n    // :\n\n    case 58:\n      return new Tok(TokenKind.COLON, pos, pos + 1, line, col, prev);\n    // =\n\n    case 61:\n      return new Tok(TokenKind.EQUALS, pos, pos + 1, line, col, prev);\n    // @\n\n    case 64:\n      return new Tok(TokenKind.AT, pos, pos + 1, line, col, prev);\n    // [\n\n    case 91:\n      return new Tok(TokenKind.BRACKET_L, pos, pos + 1, line, col, prev);\n    // ]\n\n    case 93:\n      return new Tok(TokenKind.BRACKET_R, pos, pos + 1, line, col, prev);\n    // {\n\n    case 123:\n      return new Tok(TokenKind.BRACE_L, pos, pos + 1, line, col, prev);\n    // |\n\n    case 124:\n      return new Tok(TokenKind.PIPE, pos, pos + 1, line, col, prev);\n    // }\n\n    case 125:\n      return new Tok(TokenKind.BRACE_R, pos, pos + 1, line, col, prev);\n    // A-Z _ a-z\n\n    case 65:\n    case 66:\n    case 67:\n    case 68:\n    case 69:\n    case 70:\n    case 71:\n    case 72:\n    case 73:\n    case 74:\n    case 75:\n    case 76:\n    case 77:\n    case 78:\n    case 79:\n    case 80:\n    case 81:\n    case 82:\n    case 83:\n    case 84:\n    case 85:\n    case 86:\n    case 87:\n    case 88:\n    case 89:\n    case 90:\n    case 95:\n    case 97:\n    case 98:\n    case 99:\n    case 100:\n    case 101:\n    case 102:\n    case 103:\n    case 104:\n    case 105:\n    case 106:\n    case 107:\n    case 108:\n    case 109:\n    case 110:\n    case 111:\n    case 112:\n    case 113:\n    case 114:\n    case 115:\n    case 116:\n    case 117:\n    case 118:\n    case 119:\n    case 120:\n    case 121:\n    case 122:\n      return readName(source, pos, line, col, prev);\n    // - 0-9\n\n    case 45:\n    case 48:\n    case 49:\n    case 50:\n    case 51:\n    case 52:\n    case 53:\n    case 54:\n    case 55:\n    case 56:\n    case 57:\n      return readNumber(source, pos, code, line, col, prev);\n    // \"\n\n    case 34:\n      if (body.charCodeAt(pos + 1) === 34 && body.charCodeAt(pos + 2) === 34) {\n        return readBlockString(source, pos, line, col, prev, lexer);\n      }\n\n      return readString(source, pos, line, col, prev);\n  }\n\n  throw syntaxError(source, pos, unexpectedCharacterMessage(code));\n}\n/**\n * Report a message that an unexpected character was encountered.\n */\n\n\nfunction unexpectedCharacterMessage(code) {\n  if (code < 0x0020 && code !== 0x0009 && code !== 0x000a && code !== 0x000d) {\n    return \"Cannot contain the invalid character \".concat(printCharCode(code), \".\");\n  }\n\n  if (code === 39) {\n    // '\n    return 'Unexpected single quote character (\\'), did you mean to use a double quote (\")?';\n  }\n\n  return \"Cannot parse the unexpected character \".concat(printCharCode(code), \".\");\n}\n/**\n * Reads from body starting at startPosition until it finds a non-whitespace\n * character, then returns the position of that character for lexing.\n */\n\n\nfunction positionAfterWhitespace(body, startPosition, lexer) {\n  var bodyLength = body.length;\n  var position = startPosition;\n\n  while (position < bodyLength) {\n    var code = body.charCodeAt(position); // tab | space | comma | BOM\n\n    if (code === 9 || code === 32 || code === 44 || code === 0xfeff) {\n      ++position;\n    } else if (code === 10) {\n      // new line\n      ++position;\n      ++lexer.line;\n      lexer.lineStart = position;\n    } else if (code === 13) {\n      // carriage return\n      if (body.charCodeAt(position + 1) === 10) {\n        position += 2;\n      } else {\n        ++position;\n      }\n\n      ++lexer.line;\n      lexer.lineStart = position;\n    } else {\n      break;\n    }\n  }\n\n  return position;\n}\n/**\n * Reads a comment token from the source file.\n *\n * #[\\u0009\\u0020-\\uFFFF]*\n */\n\n\nfunction readComment(source, start, line, col, prev) {\n  var body = source.body;\n  var code;\n  var position = start;\n\n  do {\n    code = body.charCodeAt(++position);\n  } while (!isNaN(code) && ( // SourceCharacter but not LineTerminator\n  code > 0x001f || code === 0x0009));\n\n  return new Tok(TokenKind.COMMENT, start, position, line, col, prev, body.slice(start + 1, position));\n}\n/**\n * Reads a number token from the source file, either a float\n * or an int depending on whether a decimal point appears.\n *\n * Int:   -?(0|[1-9][0-9]*)\n * Float: -?(0|[1-9][0-9]*)(\\.[0-9]+)?((E|e)(+|-)?[0-9]+)?\n */\n\n\nfunction readNumber(source, start, firstCode, line, col, prev) {\n  var body = source.body;\n  var code = firstCode;\n  var position = start;\n  var isFloat = false;\n\n  if (code === 45) {\n    // -\n    code = body.charCodeAt(++position);\n  }\n\n  if (code === 48) {\n    // 0\n    code = body.charCodeAt(++position);\n\n    if (code >= 48 && code <= 57) {\n      throw syntaxError(source, position, \"Invalid number, unexpected digit after 0: \".concat(printCharCode(code), \".\"));\n    }\n  } else {\n    position = readDigits(source, position, code);\n    code = body.charCodeAt(position);\n  }\n\n  if (code === 46) {\n    // .\n    isFloat = true;\n    code = body.charCodeAt(++position);\n    position = readDigits(source, position, code);\n    code = body.charCodeAt(position);\n  }\n\n  if (code === 69 || code === 101) {\n    // E e\n    isFloat = true;\n    code = body.charCodeAt(++position);\n\n    if (code === 43 || code === 45) {\n      // + -\n      code = body.charCodeAt(++position);\n    }\n\n    position = readDigits(source, position, code);\n    code = body.charCodeAt(position);\n  } // Numbers cannot be followed by . or e\n\n\n  if (code === 46 || code === 69 || code === 101) {\n    throw syntaxError(source, position, \"Invalid number, expected digit but got: \".concat(printCharCode(code), \".\"));\n  }\n\n  return new Tok(isFloat ? TokenKind.FLOAT : TokenKind.INT, start, position, line, col, prev, body.slice(start, position));\n}\n/**\n * Returns the new position in the source after reading digits.\n */\n\n\nfunction readDigits(source, start, firstCode) {\n  var body = source.body;\n  var position = start;\n  var code = firstCode;\n\n  if (code >= 48 && code <= 57) {\n    // 0 - 9\n    do {\n      code = body.charCodeAt(++position);\n    } while (code >= 48 && code <= 57); // 0 - 9\n\n\n    return position;\n  }\n\n  throw syntaxError(source, position, \"Invalid number, expected digit but got: \".concat(printCharCode(code), \".\"));\n}\n/**\n * Reads a string token from the source file.\n *\n * \"([^\"\\\\\\u000A\\u000D]|(\\\\(u[0-9a-fA-F]{4}|[\"\\\\/bfnrt])))*\"\n */\n\n\nfunction readString(source, start, line, col, prev) {\n  var body = source.body;\n  var position = start + 1;\n  var chunkStart = position;\n  var code = 0;\n  var value = '';\n\n  while (position < body.length && !isNaN(code = body.charCodeAt(position)) && // not LineTerminator\n  code !== 0x000a && code !== 0x000d) {\n    // Closing Quote (\")\n    if (code === 34) {\n      value += body.slice(chunkStart, position);\n      return new Tok(TokenKind.STRING, start, position + 1, line, col, prev, value);\n    } // SourceCharacter\n\n\n    if (code < 0x0020 && code !== 0x0009) {\n      throw syntaxError(source, position, \"Invalid character within String: \".concat(printCharCode(code), \".\"));\n    }\n\n    ++position;\n\n    if (code === 92) {\n      // \\\n      value += body.slice(chunkStart, position - 1);\n      code = body.charCodeAt(position);\n\n      switch (code) {\n        case 34:\n          value += '\"';\n          break;\n\n        case 47:\n          value += '/';\n          break;\n\n        case 92:\n          value += '\\\\';\n          break;\n\n        case 98:\n          value += '\\b';\n          break;\n\n        case 102:\n          value += '\\f';\n          break;\n\n        case 110:\n          value += '\\n';\n          break;\n\n        case 114:\n          value += '\\r';\n          break;\n\n        case 116:\n          value += '\\t';\n          break;\n\n        case 117:\n          {\n            // uXXXX\n            var charCode = uniCharCode(body.charCodeAt(position + 1), body.charCodeAt(position + 2), body.charCodeAt(position + 3), body.charCodeAt(position + 4));\n\n            if (charCode < 0) {\n              var invalidSequence = body.slice(position + 1, position + 5);\n              throw syntaxError(source, position, \"Invalid character escape sequence: \\\\u\".concat(invalidSequence, \".\"));\n            }\n\n            value += String.fromCharCode(charCode);\n            position += 4;\n            break;\n          }\n\n        default:\n          throw syntaxError(source, position, \"Invalid character escape sequence: \\\\\".concat(String.fromCharCode(code), \".\"));\n      }\n\n      ++position;\n      chunkStart = position;\n    }\n  }\n\n  throw syntaxError(source, position, 'Unterminated string.');\n}\n/**\n * Reads a block string token from the source file.\n *\n * \"\"\"(\"?\"?(\\\\\"\"\"|\\\\(?!=\"\"\")|[^\"\\\\]))*\"\"\"\n */\n\n\nfunction readBlockString(source, start, line, col, prev, lexer) {\n  var body = source.body;\n  var position = start + 3;\n  var chunkStart = position;\n  var code = 0;\n  var rawValue = '';\n\n  while (position < body.length && !isNaN(code = body.charCodeAt(position))) {\n    // Closing Triple-Quote (\"\"\")\n    if (code === 34 && body.charCodeAt(position + 1) === 34 && body.charCodeAt(position + 2) === 34) {\n      rawValue += body.slice(chunkStart, position);\n      return new Tok(TokenKind.BLOCK_STRING, start, position + 3, line, col, prev, dedentBlockStringValue(rawValue));\n    } // SourceCharacter\n\n\n    if (code < 0x0020 && code !== 0x0009 && code !== 0x000a && code !== 0x000d) {\n      throw syntaxError(source, position, \"Invalid character within String: \".concat(printCharCode(code), \".\"));\n    }\n\n    if (code === 10) {\n      // new line\n      ++position;\n      ++lexer.line;\n      lexer.lineStart = position;\n    } else if (code === 13) {\n      // carriage return\n      if (body.charCodeAt(position + 1) === 10) {\n        position += 2;\n      } else {\n        ++position;\n      }\n\n      ++lexer.line;\n      lexer.lineStart = position;\n    } else if ( // Escape Triple-Quote (\\\"\"\")\n    code === 92 && body.charCodeAt(position + 1) === 34 && body.charCodeAt(position + 2) === 34 && body.charCodeAt(position + 3) === 34) {\n      rawValue += body.slice(chunkStart, position) + '\"\"\"';\n      position += 4;\n      chunkStart = position;\n    } else {\n      ++position;\n    }\n  }\n\n  throw syntaxError(source, position, 'Unterminated string.');\n}\n/**\n * Converts four hexadecimal chars to the integer that the\n * string represents. For example, uniCharCode('0','0','0','f')\n * will return 15, and uniCharCode('0','0','f','f') returns 255.\n *\n * Returns a negative number on error, if a char was invalid.\n *\n * This is implemented by noting that char2hex() returns -1 on error,\n * which means the result of ORing the char2hex() will also be negative.\n */\n\n\nfunction uniCharCode(a, b, c, d) {\n  return char2hex(a) << 12 | char2hex(b) << 8 | char2hex(c) << 4 | char2hex(d);\n}\n/**\n * Converts a hex character to its integer value.\n * '0' becomes 0, '9' becomes 9\n * 'A' becomes 10, 'F' becomes 15\n * 'a' becomes 10, 'f' becomes 15\n *\n * Returns -1 on error.\n */\n\n\nfunction char2hex(a) {\n  return a >= 48 && a <= 57 ? a - 48 // 0-9\n  : a >= 65 && a <= 70 ? a - 55 // A-F\n  : a >= 97 && a <= 102 ? a - 87 // a-f\n  : -1;\n}\n/**\n * Reads an alphanumeric + underscore name from the source.\n *\n * [_A-Za-z][_0-9A-Za-z]*\n */\n\n\nfunction readName(source, start, line, col, prev) {\n  var body = source.body;\n  var bodyLength = body.length;\n  var position = start + 1;\n  var code = 0;\n\n  while (position !== bodyLength && !isNaN(code = body.charCodeAt(position)) && (code === 95 || // _\n  code >= 48 && code <= 57 || // 0-9\n  code >= 65 && code <= 90 || // A-Z\n  code >= 97 && code <= 122) // a-z\n  ) {\n    ++position;\n  }\n\n  return new Tok(TokenKind.NAME, start, position, line, col, prev, body.slice(start, position));\n}\n","/**\n * Represents a location in a Source.\n */\n\n/**\n * Takes a Source and a UTF-8 character offset, and returns the corresponding\n * line and column as a SourceLocation.\n */\nexport function getLocation(source, position) {\n  var lineRegexp = /\\r\\n|[\\n\\r]/g;\n  var line = 1;\n  var column = position + 1;\n  var match;\n\n  while ((match = lineRegexp.exec(source.body)) && match.index < position) {\n    line += 1;\n    column = position + 1 - (match.index + match[0].length);\n  }\n\n  return {\n    line: line,\n    column: column\n  };\n}\n","import inspect from '../jsutils/inspect';\nimport devAssert from '../jsutils/devAssert';\nimport defineToJSON from '../jsutils/defineToJSON';\nimport { syntaxError } from '../error/syntaxError';\nimport { Kind } from './kinds';\nimport { Source } from './source';\nimport { createLexer } from './lexer';\nimport { DirectiveLocation } from './directiveLocation';\nimport { TokenKind } from './tokenKind';\n\n/**\n * Given a GraphQL source, parses it into a Document.\n * Throws GraphQLError if a syntax error is encountered.\n */\nexport function parse(source, options) {\n  var parser = new Parser(source, options);\n  return parser.parseDocument();\n}\n/**\n * Given a string containing a GraphQL value (ex. `[42]`), parse the AST for\n * that value.\n * Throws GraphQLError if a syntax error is encountered.\n *\n * This is useful within tools that operate upon GraphQL Values directly and\n * in isolation of complete GraphQL documents.\n *\n * Consider providing the results to the utility function: valueFromAST().\n */\n\nexport function parseValue(source, options) {\n  var parser = new Parser(source, options);\n  parser.expectToken(TokenKind.SOF);\n  var value = parser.parseValueLiteral(false);\n  parser.expectToken(TokenKind.EOF);\n  return value;\n}\n/**\n * Given a string containing a GraphQL Type (ex. `[Int!]`), parse the AST for\n * that type.\n * Throws GraphQLError if a syntax error is encountered.\n *\n * This is useful within tools that operate upon GraphQL Types directly and\n * in isolation of complete GraphQL documents.\n *\n * Consider providing the results to the utility function: typeFromAST().\n */\n\nexport function parseType(source, options) {\n  var parser = new Parser(source, options);\n  parser.expectToken(TokenKind.SOF);\n  var type = parser.parseTypeReference();\n  parser.expectToken(TokenKind.EOF);\n  return type;\n}\n\nvar Parser =\n/*#__PURE__*/\nfunction () {\n  function Parser(source, options) {\n    var sourceObj = typeof source === 'string' ? new Source(source) : source;\n    sourceObj instanceof Source || devAssert(0, \"Must provide Source. Received: \".concat(inspect(sourceObj)));\n    this._lexer = createLexer(sourceObj);\n    this._options = options || {};\n  }\n  /**\n   * Converts a name lex token into a name parse node.\n   */\n\n\n  var _proto = Parser.prototype;\n\n  _proto.parseName = function parseName() {\n    var token = this.expectToken(TokenKind.NAME);\n    return {\n      kind: Kind.NAME,\n      value: token.value,\n      loc: this.loc(token)\n    };\n  } // Implements the parsing rules in the Document section.\n\n  /**\n   * Document : Definition+\n   */\n  ;\n\n  _proto.parseDocument = function parseDocument() {\n    var start = this._lexer.token;\n    return {\n      kind: Kind.DOCUMENT,\n      definitions: this.many(TokenKind.SOF, this.parseDefinition, TokenKind.EOF),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * Definition :\n   *   - ExecutableDefinition\n   *   - TypeSystemDefinition\n   *   - TypeSystemExtension\n   *\n   * ExecutableDefinition :\n   *   - OperationDefinition\n   *   - FragmentDefinition\n   */\n  ;\n\n  _proto.parseDefinition = function parseDefinition() {\n    if (this.peek(TokenKind.NAME)) {\n      switch (this._lexer.token.value) {\n        case 'query':\n        case 'mutation':\n        case 'subscription':\n          return this.parseOperationDefinition();\n\n        case 'fragment':\n          return this.parseFragmentDefinition();\n\n        case 'schema':\n        case 'scalar':\n        case 'type':\n        case 'interface':\n        case 'union':\n        case 'enum':\n        case 'input':\n        case 'directive':\n          return this.parseTypeSystemDefinition();\n\n        case 'extend':\n          return this.parseTypeSystemExtension();\n      }\n    } else if (this.peek(TokenKind.BRACE_L)) {\n      return this.parseOperationDefinition();\n    } else if (this.peekDescription()) {\n      return this.parseTypeSystemDefinition();\n    }\n\n    throw this.unexpected();\n  } // Implements the parsing rules in the Operations section.\n\n  /**\n   * OperationDefinition :\n   *  - SelectionSet\n   *  - OperationType Name? VariableDefinitions? Directives? SelectionSet\n   */\n  ;\n\n  _proto.parseOperationDefinition = function parseOperationDefinition() {\n    var start = this._lexer.token;\n\n    if (this.peek(TokenKind.BRACE_L)) {\n      return {\n        kind: Kind.OPERATION_DEFINITION,\n        operation: 'query',\n        name: undefined,\n        variableDefinitions: [],\n        directives: [],\n        selectionSet: this.parseSelectionSet(),\n        loc: this.loc(start)\n      };\n    }\n\n    var operation = this.parseOperationType();\n    var name;\n\n    if (this.peek(TokenKind.NAME)) {\n      name = this.parseName();\n    }\n\n    return {\n      kind: Kind.OPERATION_DEFINITION,\n      operation: operation,\n      name: name,\n      variableDefinitions: this.parseVariableDefinitions(),\n      directives: this.parseDirectives(false),\n      selectionSet: this.parseSelectionSet(),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * OperationType : one of query mutation subscription\n   */\n  ;\n\n  _proto.parseOperationType = function parseOperationType() {\n    var operationToken = this.expectToken(TokenKind.NAME);\n\n    switch (operationToken.value) {\n      case 'query':\n        return 'query';\n\n      case 'mutation':\n        return 'mutation';\n\n      case 'subscription':\n        return 'subscription';\n    }\n\n    throw this.unexpected(operationToken);\n  }\n  /**\n   * VariableDefinitions : ( VariableDefinition+ )\n   */\n  ;\n\n  _proto.parseVariableDefinitions = function parseVariableDefinitions() {\n    return this.optionalMany(TokenKind.PAREN_L, this.parseVariableDefinition, TokenKind.PAREN_R);\n  }\n  /**\n   * VariableDefinition : Variable : Type DefaultValue? Directives[Const]?\n   */\n  ;\n\n  _proto.parseVariableDefinition = function parseVariableDefinition() {\n    var start = this._lexer.token;\n    return {\n      kind: Kind.VARIABLE_DEFINITION,\n      variable: this.parseVariable(),\n      type: (this.expectToken(TokenKind.COLON), this.parseTypeReference()),\n      defaultValue: this.expectOptionalToken(TokenKind.EQUALS) ? this.parseValueLiteral(true) : undefined,\n      directives: this.parseDirectives(true),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * Variable : $ Name\n   */\n  ;\n\n  _proto.parseVariable = function parseVariable() {\n    var start = this._lexer.token;\n    this.expectToken(TokenKind.DOLLAR);\n    return {\n      kind: Kind.VARIABLE,\n      name: this.parseName(),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * SelectionSet : { Selection+ }\n   */\n  ;\n\n  _proto.parseSelectionSet = function parseSelectionSet() {\n    var start = this._lexer.token;\n    return {\n      kind: Kind.SELECTION_SET,\n      selections: this.many(TokenKind.BRACE_L, this.parseSelection, TokenKind.BRACE_R),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * Selection :\n   *   - Field\n   *   - FragmentSpread\n   *   - InlineFragment\n   */\n  ;\n\n  _proto.parseSelection = function parseSelection() {\n    return this.peek(TokenKind.SPREAD) ? this.parseFragment() : this.parseField();\n  }\n  /**\n   * Field : Alias? Name Arguments? Directives? SelectionSet?\n   *\n   * Alias : Name :\n   */\n  ;\n\n  _proto.parseField = function parseField() {\n    var start = this._lexer.token;\n    var nameOrAlias = this.parseName();\n    var alias;\n    var name;\n\n    if (this.expectOptionalToken(TokenKind.COLON)) {\n      alias = nameOrAlias;\n      name = this.parseName();\n    } else {\n      name = nameOrAlias;\n    }\n\n    return {\n      kind: Kind.FIELD,\n      alias: alias,\n      name: name,\n      arguments: this.parseArguments(false),\n      directives: this.parseDirectives(false),\n      selectionSet: this.peek(TokenKind.BRACE_L) ? this.parseSelectionSet() : undefined,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * Arguments[Const] : ( Argument[?Const]+ )\n   */\n  ;\n\n  _proto.parseArguments = function parseArguments(isConst) {\n    var item = isConst ? this.parseConstArgument : this.parseArgument;\n    return this.optionalMany(TokenKind.PAREN_L, item, TokenKind.PAREN_R);\n  }\n  /**\n   * Argument[Const] : Name : Value[?Const]\n   */\n  ;\n\n  _proto.parseArgument = function parseArgument() {\n    var start = this._lexer.token;\n    var name = this.parseName();\n    this.expectToken(TokenKind.COLON);\n    return {\n      kind: Kind.ARGUMENT,\n      name: name,\n      value: this.parseValueLiteral(false),\n      loc: this.loc(start)\n    };\n  };\n\n  _proto.parseConstArgument = function parseConstArgument() {\n    var start = this._lexer.token;\n    return {\n      kind: Kind.ARGUMENT,\n      name: this.parseName(),\n      value: (this.expectToken(TokenKind.COLON), this.parseValueLiteral(true)),\n      loc: this.loc(start)\n    };\n  } // Implements the parsing rules in the Fragments section.\n\n  /**\n   * Corresponds to both FragmentSpread and InlineFragment in the spec.\n   *\n   * FragmentSpread : ... FragmentName Directives?\n   *\n   * InlineFragment : ... TypeCondition? Directives? SelectionSet\n   */\n  ;\n\n  _proto.parseFragment = function parseFragment() {\n    var start = this._lexer.token;\n    this.expectToken(TokenKind.SPREAD);\n    var hasTypeCondition = this.expectOptionalKeyword('on');\n\n    if (!hasTypeCondition && this.peek(TokenKind.NAME)) {\n      return {\n        kind: Kind.FRAGMENT_SPREAD,\n        name: this.parseFragmentName(),\n        directives: this.parseDirectives(false),\n        loc: this.loc(start)\n      };\n    }\n\n    return {\n      kind: Kind.INLINE_FRAGMENT,\n      typeCondition: hasTypeCondition ? this.parseNamedType() : undefined,\n      directives: this.parseDirectives(false),\n      selectionSet: this.parseSelectionSet(),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * FragmentDefinition :\n   *   - fragment FragmentName on TypeCondition Directives? SelectionSet\n   *\n   * TypeCondition : NamedType\n   */\n  ;\n\n  _proto.parseFragmentDefinition = function parseFragmentDefinition() {\n    var start = this._lexer.token;\n    this.expectKeyword('fragment'); // Experimental support for defining variables within fragments changes\n    // the grammar of FragmentDefinition:\n    //   - fragment FragmentName VariableDefinitions? on TypeCondition Directives? SelectionSet\n\n    if (this._options.experimentalFragmentVariables) {\n      return {\n        kind: Kind.FRAGMENT_DEFINITION,\n        name: this.parseFragmentName(),\n        variableDefinitions: this.parseVariableDefinitions(),\n        typeCondition: (this.expectKeyword('on'), this.parseNamedType()),\n        directives: this.parseDirectives(false),\n        selectionSet: this.parseSelectionSet(),\n        loc: this.loc(start)\n      };\n    }\n\n    return {\n      kind: Kind.FRAGMENT_DEFINITION,\n      name: this.parseFragmentName(),\n      typeCondition: (this.expectKeyword('on'), this.parseNamedType()),\n      directives: this.parseDirectives(false),\n      selectionSet: this.parseSelectionSet(),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * FragmentName : Name but not `on`\n   */\n  ;\n\n  _proto.parseFragmentName = function parseFragmentName() {\n    if (this._lexer.token.value === 'on') {\n      throw this.unexpected();\n    }\n\n    return this.parseName();\n  } // Implements the parsing rules in the Values section.\n\n  /**\n   * Value[Const] :\n   *   - [~Const] Variable\n   *   - IntValue\n   *   - FloatValue\n   *   - StringValue\n   *   - BooleanValue\n   *   - NullValue\n   *   - EnumValue\n   *   - ListValue[?Const]\n   *   - ObjectValue[?Const]\n   *\n   * BooleanValue : one of `true` `false`\n   *\n   * NullValue : `null`\n   *\n   * EnumValue : Name but not `true`, `false` or `null`\n   */\n  ;\n\n  _proto.parseValueLiteral = function parseValueLiteral(isConst) {\n    var token = this._lexer.token;\n\n    switch (token.kind) {\n      case TokenKind.BRACKET_L:\n        return this.parseList(isConst);\n\n      case TokenKind.BRACE_L:\n        return this.parseObject(isConst);\n\n      case TokenKind.INT:\n        this._lexer.advance();\n\n        return {\n          kind: Kind.INT,\n          value: token.value,\n          loc: this.loc(token)\n        };\n\n      case TokenKind.FLOAT:\n        this._lexer.advance();\n\n        return {\n          kind: Kind.FLOAT,\n          value: token.value,\n          loc: this.loc(token)\n        };\n\n      case TokenKind.STRING:\n      case TokenKind.BLOCK_STRING:\n        return this.parseStringLiteral();\n\n      case TokenKind.NAME:\n        if (token.value === 'true' || token.value === 'false') {\n          this._lexer.advance();\n\n          return {\n            kind: Kind.BOOLEAN,\n            value: token.value === 'true',\n            loc: this.loc(token)\n          };\n        } else if (token.value === 'null') {\n          this._lexer.advance();\n\n          return {\n            kind: Kind.NULL,\n            loc: this.loc(token)\n          };\n        }\n\n        this._lexer.advance();\n\n        return {\n          kind: Kind.ENUM,\n          value: token.value,\n          loc: this.loc(token)\n        };\n\n      case TokenKind.DOLLAR:\n        if (!isConst) {\n          return this.parseVariable();\n        }\n\n        break;\n    }\n\n    throw this.unexpected();\n  };\n\n  _proto.parseStringLiteral = function parseStringLiteral() {\n    var token = this._lexer.token;\n\n    this._lexer.advance();\n\n    return {\n      kind: Kind.STRING,\n      value: token.value,\n      block: token.kind === TokenKind.BLOCK_STRING,\n      loc: this.loc(token)\n    };\n  }\n  /**\n   * ListValue[Const] :\n   *   - [ ]\n   *   - [ Value[?Const]+ ]\n   */\n  ;\n\n  _proto.parseList = function parseList(isConst) {\n    var _this = this;\n\n    var start = this._lexer.token;\n\n    var item = function item() {\n      return _this.parseValueLiteral(isConst);\n    };\n\n    return {\n      kind: Kind.LIST,\n      values: this.any(TokenKind.BRACKET_L, item, TokenKind.BRACKET_R),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ObjectValue[Const] :\n   *   - { }\n   *   - { ObjectField[?Const]+ }\n   */\n  ;\n\n  _proto.parseObject = function parseObject(isConst) {\n    var _this2 = this;\n\n    var start = this._lexer.token;\n\n    var item = function item() {\n      return _this2.parseObjectField(isConst);\n    };\n\n    return {\n      kind: Kind.OBJECT,\n      fields: this.any(TokenKind.BRACE_L, item, TokenKind.BRACE_R),\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ObjectField[Const] : Name : Value[?Const]\n   */\n  ;\n\n  _proto.parseObjectField = function parseObjectField(isConst) {\n    var start = this._lexer.token;\n    var name = this.parseName();\n    this.expectToken(TokenKind.COLON);\n    return {\n      kind: Kind.OBJECT_FIELD,\n      name: name,\n      value: this.parseValueLiteral(isConst),\n      loc: this.loc(start)\n    };\n  } // Implements the parsing rules in the Directives section.\n\n  /**\n   * Directives[Const] : Directive[?Const]+\n   */\n  ;\n\n  _proto.parseDirectives = function parseDirectives(isConst) {\n    var directives = [];\n\n    while (this.peek(TokenKind.AT)) {\n      directives.push(this.parseDirective(isConst));\n    }\n\n    return directives;\n  }\n  /**\n   * Directive[Const] : @ Name Arguments[?Const]?\n   */\n  ;\n\n  _proto.parseDirective = function parseDirective(isConst) {\n    var start = this._lexer.token;\n    this.expectToken(TokenKind.AT);\n    return {\n      kind: Kind.DIRECTIVE,\n      name: this.parseName(),\n      arguments: this.parseArguments(isConst),\n      loc: this.loc(start)\n    };\n  } // Implements the parsing rules in the Types section.\n\n  /**\n   * Type :\n   *   - NamedType\n   *   - ListType\n   *   - NonNullType\n   */\n  ;\n\n  _proto.parseTypeReference = function parseTypeReference() {\n    var start = this._lexer.token;\n    var type;\n\n    if (this.expectOptionalToken(TokenKind.BRACKET_L)) {\n      type = this.parseTypeReference();\n      this.expectToken(TokenKind.BRACKET_R);\n      type = {\n        kind: Kind.LIST_TYPE,\n        type: type,\n        loc: this.loc(start)\n      };\n    } else {\n      type = this.parseNamedType();\n    }\n\n    if (this.expectOptionalToken(TokenKind.BANG)) {\n      return {\n        kind: Kind.NON_NULL_TYPE,\n        type: type,\n        loc: this.loc(start)\n      };\n    }\n\n    return type;\n  }\n  /**\n   * NamedType : Name\n   */\n  ;\n\n  _proto.parseNamedType = function parseNamedType() {\n    var start = this._lexer.token;\n    return {\n      kind: Kind.NAMED_TYPE,\n      name: this.parseName(),\n      loc: this.loc(start)\n    };\n  } // Implements the parsing rules in the Type Definition section.\n\n  /**\n   * TypeSystemDefinition :\n   *   - SchemaDefinition\n   *   - TypeDefinition\n   *   - DirectiveDefinition\n   *\n   * TypeDefinition :\n   *   - ScalarTypeDefinition\n   *   - ObjectTypeDefinition\n   *   - InterfaceTypeDefinition\n   *   - UnionTypeDefinition\n   *   - EnumTypeDefinition\n   *   - InputObjectTypeDefinition\n   */\n  ;\n\n  _proto.parseTypeSystemDefinition = function parseTypeSystemDefinition() {\n    // Many definitions begin with a description and require a lookahead.\n    var keywordToken = this.peekDescription() ? this._lexer.lookahead() : this._lexer.token;\n\n    if (keywordToken.kind === TokenKind.NAME) {\n      switch (keywordToken.value) {\n        case 'schema':\n          return this.parseSchemaDefinition();\n\n        case 'scalar':\n          return this.parseScalarTypeDefinition();\n\n        case 'type':\n          return this.parseObjectTypeDefinition();\n\n        case 'interface':\n          return this.parseInterfaceTypeDefinition();\n\n        case 'union':\n          return this.parseUnionTypeDefinition();\n\n        case 'enum':\n          return this.parseEnumTypeDefinition();\n\n        case 'input':\n          return this.parseInputObjectTypeDefinition();\n\n        case 'directive':\n          return this.parseDirectiveDefinition();\n      }\n    }\n\n    throw this.unexpected(keywordToken);\n  };\n\n  _proto.peekDescription = function peekDescription() {\n    return this.peek(TokenKind.STRING) || this.peek(TokenKind.BLOCK_STRING);\n  }\n  /**\n   * Description : StringValue\n   */\n  ;\n\n  _proto.parseDescription = function parseDescription() {\n    if (this.peekDescription()) {\n      return this.parseStringLiteral();\n    }\n  }\n  /**\n   * SchemaDefinition : schema Directives[Const]? { OperationTypeDefinition+ }\n   */\n  ;\n\n  _proto.parseSchemaDefinition = function parseSchemaDefinition() {\n    var start = this._lexer.token;\n    this.expectKeyword('schema');\n    var directives = this.parseDirectives(true);\n    var operationTypes = this.many(TokenKind.BRACE_L, this.parseOperationTypeDefinition, TokenKind.BRACE_R);\n    return {\n      kind: Kind.SCHEMA_DEFINITION,\n      directives: directives,\n      operationTypes: operationTypes,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * OperationTypeDefinition : OperationType : NamedType\n   */\n  ;\n\n  _proto.parseOperationTypeDefinition = function parseOperationTypeDefinition() {\n    var start = this._lexer.token;\n    var operation = this.parseOperationType();\n    this.expectToken(TokenKind.COLON);\n    var type = this.parseNamedType();\n    return {\n      kind: Kind.OPERATION_TYPE_DEFINITION,\n      operation: operation,\n      type: type,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ScalarTypeDefinition : Description? scalar Name Directives[Const]?\n   */\n  ;\n\n  _proto.parseScalarTypeDefinition = function parseScalarTypeDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    this.expectKeyword('scalar');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    return {\n      kind: Kind.SCALAR_TYPE_DEFINITION,\n      description: description,\n      name: name,\n      directives: directives,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ObjectTypeDefinition :\n   *   Description?\n   *   type Name ImplementsInterfaces? Directives[Const]? FieldsDefinition?\n   */\n  ;\n\n  _proto.parseObjectTypeDefinition = function parseObjectTypeDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    this.expectKeyword('type');\n    var name = this.parseName();\n    var interfaces = this.parseImplementsInterfaces();\n    var directives = this.parseDirectives(true);\n    var fields = this.parseFieldsDefinition();\n    return {\n      kind: Kind.OBJECT_TYPE_DEFINITION,\n      description: description,\n      name: name,\n      interfaces: interfaces,\n      directives: directives,\n      fields: fields,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ImplementsInterfaces :\n   *   - implements `&`? NamedType\n   *   - ImplementsInterfaces & NamedType\n   */\n  ;\n\n  _proto.parseImplementsInterfaces = function parseImplementsInterfaces() {\n    var types = [];\n\n    if (this.expectOptionalKeyword('implements')) {\n      // Optional leading ampersand\n      this.expectOptionalToken(TokenKind.AMP);\n\n      do {\n        types.push(this.parseNamedType());\n      } while (this.expectOptionalToken(TokenKind.AMP) || // Legacy support for the SDL?\n      this._options.allowLegacySDLImplementsInterfaces && this.peek(TokenKind.NAME));\n    }\n\n    return types;\n  }\n  /**\n   * FieldsDefinition : { FieldDefinition+ }\n   */\n  ;\n\n  _proto.parseFieldsDefinition = function parseFieldsDefinition() {\n    // Legacy support for the SDL?\n    if (this._options.allowLegacySDLEmptyFields && this.peek(TokenKind.BRACE_L) && this._lexer.lookahead().kind === TokenKind.BRACE_R) {\n      this._lexer.advance();\n\n      this._lexer.advance();\n\n      return [];\n    }\n\n    return this.optionalMany(TokenKind.BRACE_L, this.parseFieldDefinition, TokenKind.BRACE_R);\n  }\n  /**\n   * FieldDefinition :\n   *   - Description? Name ArgumentsDefinition? : Type Directives[Const]?\n   */\n  ;\n\n  _proto.parseFieldDefinition = function parseFieldDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    var name = this.parseName();\n    var args = this.parseArgumentDefs();\n    this.expectToken(TokenKind.COLON);\n    var type = this.parseTypeReference();\n    var directives = this.parseDirectives(true);\n    return {\n      kind: Kind.FIELD_DEFINITION,\n      description: description,\n      name: name,\n      arguments: args,\n      type: type,\n      directives: directives,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ArgumentsDefinition : ( InputValueDefinition+ )\n   */\n  ;\n\n  _proto.parseArgumentDefs = function parseArgumentDefs() {\n    return this.optionalMany(TokenKind.PAREN_L, this.parseInputValueDef, TokenKind.PAREN_R);\n  }\n  /**\n   * InputValueDefinition :\n   *   - Description? Name : Type DefaultValue? Directives[Const]?\n   */\n  ;\n\n  _proto.parseInputValueDef = function parseInputValueDef() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    var name = this.parseName();\n    this.expectToken(TokenKind.COLON);\n    var type = this.parseTypeReference();\n    var defaultValue;\n\n    if (this.expectOptionalToken(TokenKind.EQUALS)) {\n      defaultValue = this.parseValueLiteral(true);\n    }\n\n    var directives = this.parseDirectives(true);\n    return {\n      kind: Kind.INPUT_VALUE_DEFINITION,\n      description: description,\n      name: name,\n      type: type,\n      defaultValue: defaultValue,\n      directives: directives,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * InterfaceTypeDefinition :\n   *   - Description? interface Name Directives[Const]? FieldsDefinition?\n   */\n  ;\n\n  _proto.parseInterfaceTypeDefinition = function parseInterfaceTypeDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    this.expectKeyword('interface');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var fields = this.parseFieldsDefinition();\n    return {\n      kind: Kind.INTERFACE_TYPE_DEFINITION,\n      description: description,\n      name: name,\n      directives: directives,\n      fields: fields,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * UnionTypeDefinition :\n   *   - Description? union Name Directives[Const]? UnionMemberTypes?\n   */\n  ;\n\n  _proto.parseUnionTypeDefinition = function parseUnionTypeDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    this.expectKeyword('union');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var types = this.parseUnionMemberTypes();\n    return {\n      kind: Kind.UNION_TYPE_DEFINITION,\n      description: description,\n      name: name,\n      directives: directives,\n      types: types,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * UnionMemberTypes :\n   *   - = `|`? NamedType\n   *   - UnionMemberTypes | NamedType\n   */\n  ;\n\n  _proto.parseUnionMemberTypes = function parseUnionMemberTypes() {\n    var types = [];\n\n    if (this.expectOptionalToken(TokenKind.EQUALS)) {\n      // Optional leading pipe\n      this.expectOptionalToken(TokenKind.PIPE);\n\n      do {\n        types.push(this.parseNamedType());\n      } while (this.expectOptionalToken(TokenKind.PIPE));\n    }\n\n    return types;\n  }\n  /**\n   * EnumTypeDefinition :\n   *   - Description? enum Name Directives[Const]? EnumValuesDefinition?\n   */\n  ;\n\n  _proto.parseEnumTypeDefinition = function parseEnumTypeDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    this.expectKeyword('enum');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var values = this.parseEnumValuesDefinition();\n    return {\n      kind: Kind.ENUM_TYPE_DEFINITION,\n      description: description,\n      name: name,\n      directives: directives,\n      values: values,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * EnumValuesDefinition : { EnumValueDefinition+ }\n   */\n  ;\n\n  _proto.parseEnumValuesDefinition = function parseEnumValuesDefinition() {\n    return this.optionalMany(TokenKind.BRACE_L, this.parseEnumValueDefinition, TokenKind.BRACE_R);\n  }\n  /**\n   * EnumValueDefinition : Description? EnumValue Directives[Const]?\n   *\n   * EnumValue : Name\n   */\n  ;\n\n  _proto.parseEnumValueDefinition = function parseEnumValueDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    return {\n      kind: Kind.ENUM_VALUE_DEFINITION,\n      description: description,\n      name: name,\n      directives: directives,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * InputObjectTypeDefinition :\n   *   - Description? input Name Directives[Const]? InputFieldsDefinition?\n   */\n  ;\n\n  _proto.parseInputObjectTypeDefinition = function parseInputObjectTypeDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    this.expectKeyword('input');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var fields = this.parseInputFieldsDefinition();\n    return {\n      kind: Kind.INPUT_OBJECT_TYPE_DEFINITION,\n      description: description,\n      name: name,\n      directives: directives,\n      fields: fields,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * InputFieldsDefinition : { InputValueDefinition+ }\n   */\n  ;\n\n  _proto.parseInputFieldsDefinition = function parseInputFieldsDefinition() {\n    return this.optionalMany(TokenKind.BRACE_L, this.parseInputValueDef, TokenKind.BRACE_R);\n  }\n  /**\n   * TypeSystemExtension :\n   *   - SchemaExtension\n   *   - TypeExtension\n   *\n   * TypeExtension :\n   *   - ScalarTypeExtension\n   *   - ObjectTypeExtension\n   *   - InterfaceTypeExtension\n   *   - UnionTypeExtension\n   *   - EnumTypeExtension\n   *   - InputObjectTypeDefinition\n   */\n  ;\n\n  _proto.parseTypeSystemExtension = function parseTypeSystemExtension() {\n    var keywordToken = this._lexer.lookahead();\n\n    if (keywordToken.kind === TokenKind.NAME) {\n      switch (keywordToken.value) {\n        case 'schema':\n          return this.parseSchemaExtension();\n\n        case 'scalar':\n          return this.parseScalarTypeExtension();\n\n        case 'type':\n          return this.parseObjectTypeExtension();\n\n        case 'interface':\n          return this.parseInterfaceTypeExtension();\n\n        case 'union':\n          return this.parseUnionTypeExtension();\n\n        case 'enum':\n          return this.parseEnumTypeExtension();\n\n        case 'input':\n          return this.parseInputObjectTypeExtension();\n      }\n    }\n\n    throw this.unexpected(keywordToken);\n  }\n  /**\n   * SchemaExtension :\n   *  - extend schema Directives[Const]? { OperationTypeDefinition+ }\n   *  - extend schema Directives[Const]\n   */\n  ;\n\n  _proto.parseSchemaExtension = function parseSchemaExtension() {\n    var start = this._lexer.token;\n    this.expectKeyword('extend');\n    this.expectKeyword('schema');\n    var directives = this.parseDirectives(true);\n    var operationTypes = this.optionalMany(TokenKind.BRACE_L, this.parseOperationTypeDefinition, TokenKind.BRACE_R);\n\n    if (directives.length === 0 && operationTypes.length === 0) {\n      throw this.unexpected();\n    }\n\n    return {\n      kind: Kind.SCHEMA_EXTENSION,\n      directives: directives,\n      operationTypes: operationTypes,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ScalarTypeExtension :\n   *   - extend scalar Name Directives[Const]\n   */\n  ;\n\n  _proto.parseScalarTypeExtension = function parseScalarTypeExtension() {\n    var start = this._lexer.token;\n    this.expectKeyword('extend');\n    this.expectKeyword('scalar');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n\n    if (directives.length === 0) {\n      throw this.unexpected();\n    }\n\n    return {\n      kind: Kind.SCALAR_TYPE_EXTENSION,\n      name: name,\n      directives: directives,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * ObjectTypeExtension :\n   *  - extend type Name ImplementsInterfaces? Directives[Const]? FieldsDefinition\n   *  - extend type Name ImplementsInterfaces? Directives[Const]\n   *  - extend type Name ImplementsInterfaces\n   */\n  ;\n\n  _proto.parseObjectTypeExtension = function parseObjectTypeExtension() {\n    var start = this._lexer.token;\n    this.expectKeyword('extend');\n    this.expectKeyword('type');\n    var name = this.parseName();\n    var interfaces = this.parseImplementsInterfaces();\n    var directives = this.parseDirectives(true);\n    var fields = this.parseFieldsDefinition();\n\n    if (interfaces.length === 0 && directives.length === 0 && fields.length === 0) {\n      throw this.unexpected();\n    }\n\n    return {\n      kind: Kind.OBJECT_TYPE_EXTENSION,\n      name: name,\n      interfaces: interfaces,\n      directives: directives,\n      fields: fields,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * InterfaceTypeExtension :\n   *   - extend interface Name Directives[Const]? FieldsDefinition\n   *   - extend interface Name Directives[Const]\n   */\n  ;\n\n  _proto.parseInterfaceTypeExtension = function parseInterfaceTypeExtension() {\n    var start = this._lexer.token;\n    this.expectKeyword('extend');\n    this.expectKeyword('interface');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var fields = this.parseFieldsDefinition();\n\n    if (directives.length === 0 && fields.length === 0) {\n      throw this.unexpected();\n    }\n\n    return {\n      kind: Kind.INTERFACE_TYPE_EXTENSION,\n      name: name,\n      directives: directives,\n      fields: fields,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * UnionTypeExtension :\n   *   - extend union Name Directives[Const]? UnionMemberTypes\n   *   - extend union Name Directives[Const]\n   */\n  ;\n\n  _proto.parseUnionTypeExtension = function parseUnionTypeExtension() {\n    var start = this._lexer.token;\n    this.expectKeyword('extend');\n    this.expectKeyword('union');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var types = this.parseUnionMemberTypes();\n\n    if (directives.length === 0 && types.length === 0) {\n      throw this.unexpected();\n    }\n\n    return {\n      kind: Kind.UNION_TYPE_EXTENSION,\n      name: name,\n      directives: directives,\n      types: types,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * EnumTypeExtension :\n   *   - extend enum Name Directives[Const]? EnumValuesDefinition\n   *   - extend enum Name Directives[Const]\n   */\n  ;\n\n  _proto.parseEnumTypeExtension = function parseEnumTypeExtension() {\n    var start = this._lexer.token;\n    this.expectKeyword('extend');\n    this.expectKeyword('enum');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var values = this.parseEnumValuesDefinition();\n\n    if (directives.length === 0 && values.length === 0) {\n      throw this.unexpected();\n    }\n\n    return {\n      kind: Kind.ENUM_TYPE_EXTENSION,\n      name: name,\n      directives: directives,\n      values: values,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * InputObjectTypeExtension :\n   *   - extend input Name Directives[Const]? InputFieldsDefinition\n   *   - extend input Name Directives[Const]\n   */\n  ;\n\n  _proto.parseInputObjectTypeExtension = function parseInputObjectTypeExtension() {\n    var start = this._lexer.token;\n    this.expectKeyword('extend');\n    this.expectKeyword('input');\n    var name = this.parseName();\n    var directives = this.parseDirectives(true);\n    var fields = this.parseInputFieldsDefinition();\n\n    if (directives.length === 0 && fields.length === 0) {\n      throw this.unexpected();\n    }\n\n    return {\n      kind: Kind.INPUT_OBJECT_TYPE_EXTENSION,\n      name: name,\n      directives: directives,\n      fields: fields,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * DirectiveDefinition :\n   *   - Description? directive @ Name ArgumentsDefinition? `repeatable`? on DirectiveLocations\n   */\n  ;\n\n  _proto.parseDirectiveDefinition = function parseDirectiveDefinition() {\n    var start = this._lexer.token;\n    var description = this.parseDescription();\n    this.expectKeyword('directive');\n    this.expectToken(TokenKind.AT);\n    var name = this.parseName();\n    var args = this.parseArgumentDefs();\n    var repeatable = this.expectOptionalKeyword('repeatable');\n    this.expectKeyword('on');\n    var locations = this.parseDirectiveLocations();\n    return {\n      kind: Kind.DIRECTIVE_DEFINITION,\n      description: description,\n      name: name,\n      arguments: args,\n      repeatable: repeatable,\n      locations: locations,\n      loc: this.loc(start)\n    };\n  }\n  /**\n   * DirectiveLocations :\n   *   - `|`? DirectiveLocation\n   *   - DirectiveLocations | DirectiveLocation\n   */\n  ;\n\n  _proto.parseDirectiveLocations = function parseDirectiveLocations() {\n    // Optional leading pipe\n    this.expectOptionalToken(TokenKind.PIPE);\n    var locations = [];\n\n    do {\n      locations.push(this.parseDirectiveLocation());\n    } while (this.expectOptionalToken(TokenKind.PIPE));\n\n    return locations;\n  }\n  /*\n   * DirectiveLocation :\n   *   - ExecutableDirectiveLocation\n   *   - TypeSystemDirectiveLocation\n   *\n   * ExecutableDirectiveLocation : one of\n   *   `QUERY`\n   *   `MUTATION`\n   *   `SUBSCRIPTION`\n   *   `FIELD`\n   *   `FRAGMENT_DEFINITION`\n   *   `FRAGMENT_SPREAD`\n   *   `INLINE_FRAGMENT`\n   *\n   * TypeSystemDirectiveLocation : one of\n   *   `SCHEMA`\n   *   `SCALAR`\n   *   `OBJECT`\n   *   `FIELD_DEFINITION`\n   *   `ARGUMENT_DEFINITION`\n   *   `INTERFACE`\n   *   `UNION`\n   *   `ENUM`\n   *   `ENUM_VALUE`\n   *   `INPUT_OBJECT`\n   *   `INPUT_FIELD_DEFINITION`\n   */\n  ;\n\n  _proto.parseDirectiveLocation = function parseDirectiveLocation() {\n    var start = this._lexer.token;\n    var name = this.parseName();\n\n    if (DirectiveLocation[name.value] !== undefined) {\n      return name;\n    }\n\n    throw this.unexpected(start);\n  } // Core parsing utility functions\n\n  /**\n   * Returns a location object, used to identify the place in\n   * the source that created a given parsed object.\n   */\n  ;\n\n  _proto.loc = function loc(startToken) {\n    if (!this._options.noLocation) {\n      return new Loc(startToken, this._lexer.lastToken, this._lexer.source);\n    }\n  }\n  /**\n   * Determines if the next token is of a given kind\n   */\n  ;\n\n  _proto.peek = function peek(kind) {\n    return this._lexer.token.kind === kind;\n  }\n  /**\n   * If the next token is of the given kind, return that token after advancing\n   * the lexer. Otherwise, do not change the parser state and throw an error.\n   */\n  ;\n\n  _proto.expectToken = function expectToken(kind) {\n    var token = this._lexer.token;\n\n    if (token.kind === kind) {\n      this._lexer.advance();\n\n      return token;\n    }\n\n    throw syntaxError(this._lexer.source, token.start, \"Expected \".concat(kind, \", found \").concat(getTokenDesc(token)));\n  }\n  /**\n   * If the next token is of the given kind, return that token after advancing\n   * the lexer. Otherwise, do not change the parser state and return undefined.\n   */\n  ;\n\n  _proto.expectOptionalToken = function expectOptionalToken(kind) {\n    var token = this._lexer.token;\n\n    if (token.kind === kind) {\n      this._lexer.advance();\n\n      return token;\n    }\n\n    return undefined;\n  }\n  /**\n   * If the next token is a given keyword, advance the lexer.\n   * Otherwise, do not change the parser state and throw an error.\n   */\n  ;\n\n  _proto.expectKeyword = function expectKeyword(value) {\n    var token = this._lexer.token;\n\n    if (token.kind === TokenKind.NAME && token.value === value) {\n      this._lexer.advance();\n    } else {\n      throw syntaxError(this._lexer.source, token.start, \"Expected \\\"\".concat(value, \"\\\", found \").concat(getTokenDesc(token)));\n    }\n  }\n  /**\n   * If the next token is a given keyword, return \"true\" after advancing\n   * the lexer. Otherwise, do not change the parser state and return \"false\".\n   */\n  ;\n\n  _proto.expectOptionalKeyword = function expectOptionalKeyword(value) {\n    var token = this._lexer.token;\n\n    if (token.kind === TokenKind.NAME && token.value === value) {\n      this._lexer.advance();\n\n      return true;\n    }\n\n    return false;\n  }\n  /**\n   * Helper function for creating an error when an unexpected lexed token\n   * is encountered.\n   */\n  ;\n\n  _proto.unexpected = function unexpected(atToken) {\n    var token = atToken || this._lexer.token;\n    return syntaxError(this._lexer.source, token.start, \"Unexpected \".concat(getTokenDesc(token)));\n  }\n  /**\n   * Returns a possibly empty list of parse nodes, determined by\n   * the parseFn. This list begins with a lex token of openKind\n   * and ends with a lex token of closeKind. Advances the parser\n   * to the next lex token after the closing token.\n   */\n  ;\n\n  _proto.any = function any(openKind, parseFn, closeKind) {\n    this.expectToken(openKind);\n    var nodes = [];\n\n    while (!this.expectOptionalToken(closeKind)) {\n      nodes.push(parseFn.call(this));\n    }\n\n    return nodes;\n  }\n  /**\n   * Returns a list of parse nodes, determined by the parseFn.\n   * It can be empty only if open token is missing otherwise it will always\n   * return non-empty list that begins with a lex token of openKind and ends\n   * with a lex token of closeKind. Advances the parser to the next lex token\n   * after the closing token.\n   */\n  ;\n\n  _proto.optionalMany = function optionalMany(openKind, parseFn, closeKind) {\n    if (this.expectOptionalToken(openKind)) {\n      var nodes = [];\n\n      do {\n        nodes.push(parseFn.call(this));\n      } while (!this.expectOptionalToken(closeKind));\n\n      return nodes;\n    }\n\n    return [];\n  }\n  /**\n   * Returns a non-empty list of parse nodes, determined by\n   * the parseFn. This list begins with a lex token of openKind\n   * and ends with a lex token of closeKind. Advances the parser\n   * to the next lex token after the closing token.\n   */\n  ;\n\n  _proto.many = function many(openKind, parseFn, closeKind) {\n    this.expectToken(openKind);\n    var nodes = [];\n\n    do {\n      nodes.push(parseFn.call(this));\n    } while (!this.expectOptionalToken(closeKind));\n\n    return nodes;\n  };\n\n  return Parser;\n}();\n\nfunction Loc(startToken, endToken, source) {\n  this.start = startToken.start;\n  this.end = endToken.end;\n  this.startToken = startToken;\n  this.endToken = endToken;\n  this.source = source;\n} // Print a simplified form when appearing in JSON/util.inspect.\n\n\ndefineToJSON(Loc, function () {\n  return {\n    start: this.start,\n    end: this.end\n  };\n});\n/**\n * A helper function to describe a token as a string for debugging\n */\n\nfunction getTokenDesc(token) {\n  var value = token.value;\n  return value ? \"\".concat(token.kind, \" \\\"\").concat(value, \"\\\"\") : token.kind;\n}\n","import { getLocation } from '../language/location';\n/**\n * Render a helpful description of the location in the GraphQL Source document.\n */\n\nexport function printLocation(location) {\n  return printSourceLocation(location.source, getLocation(location.source, location.start));\n}\n/**\n * Render a helpful description of the location in the GraphQL Source document.\n */\n\nexport function printSourceLocation(source, sourceLocation) {\n  var firstLineColumnOffset = source.locationOffset.column - 1;\n  var body = whitespace(firstLineColumnOffset) + source.body;\n  var lineIndex = sourceLocation.line - 1;\n  var lineOffset = source.locationOffset.line - 1;\n  var lineNum = sourceLocation.line + lineOffset;\n  var columnOffset = sourceLocation.line === 1 ? firstLineColumnOffset : 0;\n  var columnNum = sourceLocation.column + columnOffset;\n  var locationStr = \"\".concat(source.name, \":\").concat(lineNum, \":\").concat(columnNum, \"\\n\");\n  var lines = body.split(/\\r\\n|[\\n\\r]/g);\n  var locationLine = lines[lineIndex]; // Special case for minified documents\n\n  if (locationLine.length > 120) {\n    var sublineIndex = Math.floor(columnNum / 80);\n    var sublineColumnNum = columnNum % 80;\n    var sublines = [];\n\n    for (var i = 0; i < locationLine.length; i += 80) {\n      sublines.push(locationLine.slice(i, i + 80));\n    }\n\n    return locationStr + printPrefixedLines([[\"\".concat(lineNum), sublines[0]]].concat(sublines.slice(1, sublineIndex + 1).map(function (subline) {\n      return ['', subline];\n    }), [[' ', whitespace(sublineColumnNum - 1) + '^'], ['', sublines[sublineIndex + 1]]]));\n  }\n\n  return locationStr + printPrefixedLines([// Lines specified like this: [\"prefix\", \"string\"],\n  [\"\".concat(lineNum - 1), lines[lineIndex - 1]], [\"\".concat(lineNum), locationLine], ['', whitespace(columnNum - 1) + '^'], [\"\".concat(lineNum + 1), lines[lineIndex + 1]]]);\n}\n\nfunction printPrefixedLines(lines) {\n  var existingLines = lines.filter(function (_ref) {\n    var _ = _ref[0],\n        line = _ref[1];\n    return line !== undefined;\n  });\n  var padLen = Math.max.apply(Math, existingLines.map(function (_ref2) {\n    var prefix = _ref2[0];\n    return prefix.length;\n  }));\n  return existingLines.map(function (_ref3) {\n    var prefix = _ref3[0],\n        line = _ref3[1];\n    return lpad(padLen, prefix) + (line ? ' | ' + line : ' |');\n  }).join('\\n');\n}\n\nfunction whitespace(len) {\n  return Array(len + 1).join(' ');\n}\n\nfunction lpad(len, str) {\n  return whitespace(len - str.length) + str;\n}\n","import { visit } from './visitor';\nimport { printBlockString } from './blockString';\n/**\n * Converts an AST into a string, using one set of reasonable\n * formatting rules.\n */\n\nexport function print(ast) {\n  return visit(ast, {\n    leave: printDocASTReducer\n  });\n} // TODO: provide better type coverage in future\n\nvar printDocASTReducer = {\n  Name: function Name(node) {\n    return node.value;\n  },\n  Variable: function Variable(node) {\n    return '$' + node.name;\n  },\n  // Document\n  Document: function Document(node) {\n    return join(node.definitions, '\\n\\n') + '\\n';\n  },\n  OperationDefinition: function OperationDefinition(node) {\n    var op = node.operation;\n    var name = node.name;\n    var varDefs = wrap('(', join(node.variableDefinitions, ', '), ')');\n    var directives = join(node.directives, ' ');\n    var selectionSet = node.selectionSet; // Anonymous queries with no directives or variable definitions can use\n    // the query short form.\n\n    return !name && !directives && !varDefs && op === 'query' ? selectionSet : join([op, join([name, varDefs]), directives, selectionSet], ' ');\n  },\n  VariableDefinition: function VariableDefinition(_ref) {\n    var variable = _ref.variable,\n        type = _ref.type,\n        defaultValue = _ref.defaultValue,\n        directives = _ref.directives;\n    return variable + ': ' + type + wrap(' = ', defaultValue) + wrap(' ', join(directives, ' '));\n  },\n  SelectionSet: function SelectionSet(_ref2) {\n    var selections = _ref2.selections;\n    return block(selections);\n  },\n  Field: function Field(_ref3) {\n    var alias = _ref3.alias,\n        name = _ref3.name,\n        args = _ref3.arguments,\n        directives = _ref3.directives,\n        selectionSet = _ref3.selectionSet;\n    return join([wrap('', alias, ': ') + name + wrap('(', join(args, ', '), ')'), join(directives, ' '), selectionSet], ' ');\n  },\n  Argument: function Argument(_ref4) {\n    var name = _ref4.name,\n        value = _ref4.value;\n    return name + ': ' + value;\n  },\n  // Fragments\n  FragmentSpread: function FragmentSpread(_ref5) {\n    var name = _ref5.name,\n        directives = _ref5.directives;\n    return '...' + name + wrap(' ', join(directives, ' '));\n  },\n  InlineFragment: function InlineFragment(_ref6) {\n    var typeCondition = _ref6.typeCondition,\n        directives = _ref6.directives,\n        selectionSet = _ref6.selectionSet;\n    return join(['...', wrap('on ', typeCondition), join(directives, ' '), selectionSet], ' ');\n  },\n  FragmentDefinition: function FragmentDefinition(_ref7) {\n    var name = _ref7.name,\n        typeCondition = _ref7.typeCondition,\n        variableDefinitions = _ref7.variableDefinitions,\n        directives = _ref7.directives,\n        selectionSet = _ref7.selectionSet;\n    return (// Note: fragment variable definitions are experimental and may be changed\n      // or removed in the future.\n      \"fragment \".concat(name).concat(wrap('(', join(variableDefinitions, ', '), ')'), \" \") + \"on \".concat(typeCondition, \" \").concat(wrap('', join(directives, ' '), ' ')) + selectionSet\n    );\n  },\n  // Value\n  IntValue: function IntValue(_ref8) {\n    var value = _ref8.value;\n    return value;\n  },\n  FloatValue: function FloatValue(_ref9) {\n    var value = _ref9.value;\n    return value;\n  },\n  StringValue: function StringValue(_ref10, key) {\n    var value = _ref10.value,\n        isBlockString = _ref10.block;\n    return isBlockString ? printBlockString(value, key === 'description' ? '' : '  ') : JSON.stringify(value);\n  },\n  BooleanValue: function BooleanValue(_ref11) {\n    var value = _ref11.value;\n    return value ? 'true' : 'false';\n  },\n  NullValue: function NullValue() {\n    return 'null';\n  },\n  EnumValue: function EnumValue(_ref12) {\n    var value = _ref12.value;\n    return value;\n  },\n  ListValue: function ListValue(_ref13) {\n    var values = _ref13.values;\n    return '[' + join(values, ', ') + ']';\n  },\n  ObjectValue: function ObjectValue(_ref14) {\n    var fields = _ref14.fields;\n    return '{' + join(fields, ', ') + '}';\n  },\n  ObjectField: function ObjectField(_ref15) {\n    var name = _ref15.name,\n        value = _ref15.value;\n    return name + ': ' + value;\n  },\n  // Directive\n  Directive: function Directive(_ref16) {\n    var name = _ref16.name,\n        args = _ref16.arguments;\n    return '@' + name + wrap('(', join(args, ', '), ')');\n  },\n  // Type\n  NamedType: function NamedType(_ref17) {\n    var name = _ref17.name;\n    return name;\n  },\n  ListType: function ListType(_ref18) {\n    var type = _ref18.type;\n    return '[' + type + ']';\n  },\n  NonNullType: function NonNullType(_ref19) {\n    var type = _ref19.type;\n    return type + '!';\n  },\n  // Type System Definitions\n  SchemaDefinition: function SchemaDefinition(_ref20) {\n    var directives = _ref20.directives,\n        operationTypes = _ref20.operationTypes;\n    return join(['schema', join(directives, ' '), block(operationTypes)], ' ');\n  },\n  OperationTypeDefinition: function OperationTypeDefinition(_ref21) {\n    var operation = _ref21.operation,\n        type = _ref21.type;\n    return operation + ': ' + type;\n  },\n  ScalarTypeDefinition: addDescription(function (_ref22) {\n    var name = _ref22.name,\n        directives = _ref22.directives;\n    return join(['scalar', name, join(directives, ' ')], ' ');\n  }),\n  ObjectTypeDefinition: addDescription(function (_ref23) {\n    var name = _ref23.name,\n        interfaces = _ref23.interfaces,\n        directives = _ref23.directives,\n        fields = _ref23.fields;\n    return join(['type', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' ');\n  }),\n  FieldDefinition: addDescription(function (_ref24) {\n    var name = _ref24.name,\n        args = _ref24.arguments,\n        type = _ref24.type,\n        directives = _ref24.directives;\n    return name + (hasMultilineItems(args) ? wrap('(\\n', indent(join(args, '\\n')), '\\n)') : wrap('(', join(args, ', '), ')')) + ': ' + type + wrap(' ', join(directives, ' '));\n  }),\n  InputValueDefinition: addDescription(function (_ref25) {\n    var name = _ref25.name,\n        type = _ref25.type,\n        defaultValue = _ref25.defaultValue,\n        directives = _ref25.directives;\n    return join([name + ': ' + type, wrap('= ', defaultValue), join(directives, ' ')], ' ');\n  }),\n  InterfaceTypeDefinition: addDescription(function (_ref26) {\n    var name = _ref26.name,\n        directives = _ref26.directives,\n        fields = _ref26.fields;\n    return join(['interface', name, join(directives, ' '), block(fields)], ' ');\n  }),\n  UnionTypeDefinition: addDescription(function (_ref27) {\n    var name = _ref27.name,\n        directives = _ref27.directives,\n        types = _ref27.types;\n    return join(['union', name, join(directives, ' '), types && types.length !== 0 ? '= ' + join(types, ' | ') : ''], ' ');\n  }),\n  EnumTypeDefinition: addDescription(function (_ref28) {\n    var name = _ref28.name,\n        directives = _ref28.directives,\n        values = _ref28.values;\n    return join(['enum', name, join(directives, ' '), block(values)], ' ');\n  }),\n  EnumValueDefinition: addDescription(function (_ref29) {\n    var name = _ref29.name,\n        directives = _ref29.directives;\n    return join([name, join(directives, ' ')], ' ');\n  }),\n  InputObjectTypeDefinition: addDescription(function (_ref30) {\n    var name = _ref30.name,\n        directives = _ref30.directives,\n        fields = _ref30.fields;\n    return join(['input', name, join(directives, ' '), block(fields)], ' ');\n  }),\n  DirectiveDefinition: addDescription(function (_ref31) {\n    var name = _ref31.name,\n        args = _ref31.arguments,\n        repeatable = _ref31.repeatable,\n        locations = _ref31.locations;\n    return 'directive @' + name + (hasMultilineItems(args) ? wrap('(\\n', indent(join(args, '\\n')), '\\n)') : wrap('(', join(args, ', '), ')')) + (repeatable ? ' repeatable' : '') + ' on ' + join(locations, ' | ');\n  }),\n  SchemaExtension: function SchemaExtension(_ref32) {\n    var directives = _ref32.directives,\n        operationTypes = _ref32.operationTypes;\n    return join(['extend schema', join(directives, ' '), block(operationTypes)], ' ');\n  },\n  ScalarTypeExtension: function ScalarTypeExtension(_ref33) {\n    var name = _ref33.name,\n        directives = _ref33.directives;\n    return join(['extend scalar', name, join(directives, ' ')], ' ');\n  },\n  ObjectTypeExtension: function ObjectTypeExtension(_ref34) {\n    var name = _ref34.name,\n        interfaces = _ref34.interfaces,\n        directives = _ref34.directives,\n        fields = _ref34.fields;\n    return join(['extend type', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' ');\n  },\n  InterfaceTypeExtension: function InterfaceTypeExtension(_ref35) {\n    var name = _ref35.name,\n        directives = _ref35.directives,\n        fields = _ref35.fields;\n    return join(['extend interface', name, join(directives, ' '), block(fields)], ' ');\n  },\n  UnionTypeExtension: function UnionTypeExtension(_ref36) {\n    var name = _ref36.name,\n        directives = _ref36.directives,\n        types = _ref36.types;\n    return join(['extend union', name, join(directives, ' '), types && types.length !== 0 ? '= ' + join(types, ' | ') : ''], ' ');\n  },\n  EnumTypeExtension: function EnumTypeExtension(_ref37) {\n    var name = _ref37.name,\n        directives = _ref37.directives,\n        values = _ref37.values;\n    return join(['extend enum', name, join(directives, ' '), block(values)], ' ');\n  },\n  InputObjectTypeExtension: function InputObjectTypeExtension(_ref38) {\n    var name = _ref38.name,\n        directives = _ref38.directives,\n        fields = _ref38.fields;\n    return join(['extend input', name, join(directives, ' '), block(fields)], ' ');\n  }\n};\n\nfunction addDescription(cb) {\n  return function (node) {\n    return join([node.description, cb(node)], '\\n');\n  };\n}\n/**\n * Given maybeArray, print an empty string if it is null or empty, otherwise\n * print all items together separated by separator if provided\n */\n\n\nfunction join(maybeArray, separator) {\n  return maybeArray ? maybeArray.filter(function (x) {\n    return x;\n  }).join(separator || '') : '';\n}\n/**\n * Given array, print each item on its own line, wrapped in an\n * indented \"{ }\" block.\n */\n\n\nfunction block(array) {\n  return array && array.length !== 0 ? '{\\n' + indent(join(array, '\\n')) + '\\n}' : '';\n}\n/**\n * If maybeString is not null or empty, then wrap with start and end, otherwise\n * print an empty string.\n */\n\n\nfunction wrap(start, maybeString, end) {\n  return maybeString ? start + maybeString + (end || '') : '';\n}\n\nfunction indent(maybeString) {\n  return maybeString && '  ' + maybeString.replace(/\\n/g, '\\n  ');\n}\n\nfunction isMultiline(string) {\n  return string.indexOf('\\n') !== -1;\n}\n\nfunction hasMultilineItems(maybeArray) {\n  return maybeArray && maybeArray.some(isMultiline);\n}\n","import devAssert from '../jsutils/devAssert';\nimport defineToStringTag from '../jsutils/defineToStringTag';\n\n/**\n * A representation of source input to GraphQL.\n * `name` and `locationOffset` are optional. They are useful for clients who\n * store GraphQL documents in source files; for example, if the GraphQL input\n * starts at line 40 in a file named Foo.graphql, it might be useful for name to\n * be \"Foo.graphql\" and location to be `{ line: 40, column: 0 }`.\n * line and column in locationOffset are 1-indexed\n */\nexport var Source = function Source(body, name, locationOffset) {\n  this.body = body;\n  this.name = name || 'GraphQL request';\n  this.locationOffset = locationOffset || {\n    line: 1,\n    column: 1\n  };\n  this.locationOffset.line > 0 || devAssert(0, 'line in locationOffset is 1-indexed and must be positive');\n  this.locationOffset.column > 0 || devAssert(0, 'column in locationOffset is 1-indexed and must be positive');\n}; // Conditionally apply `[Symbol.toStringTag]` if `Symbol`s are supported\n\ndefineToStringTag(Source);\n","/**\n * An exported enum describing the different kinds of tokens that the\n * lexer emits.\n */\nexport var TokenKind = Object.freeze({\n  SOF: '<SOF>',\n  EOF: '<EOF>',\n  BANG: '!',\n  DOLLAR: '$',\n  AMP: '&',\n  PAREN_L: '(',\n  PAREN_R: ')',\n  SPREAD: '...',\n  COLON: ':',\n  EQUALS: '=',\n  AT: '@',\n  BRACKET_L: '[',\n  BRACKET_R: ']',\n  BRACE_L: '{',\n  PIPE: '|',\n  BRACE_R: '}',\n  NAME: 'Name',\n  INT: 'Int',\n  FLOAT: 'Float',\n  STRING: 'String',\n  BLOCK_STRING: 'BlockString',\n  COMMENT: 'Comment'\n});\n/**\n * The enum type representing the token kinds values.\n */\n","import inspect from '../jsutils/inspect';\nexport var QueryDocumentKeys = {\n  Name: [],\n  Document: ['definitions'],\n  OperationDefinition: ['name', 'variableDefinitions', 'directives', 'selectionSet'],\n  VariableDefinition: ['variable', 'type', 'defaultValue', 'directives'],\n  Variable: ['name'],\n  SelectionSet: ['selections'],\n  Field: ['alias', 'name', 'arguments', 'directives', 'selectionSet'],\n  Argument: ['name', 'value'],\n  FragmentSpread: ['name', 'directives'],\n  InlineFragment: ['typeCondition', 'directives', 'selectionSet'],\n  FragmentDefinition: ['name', // Note: fragment variable definitions are experimental and may be changed\n  // or removed in the future.\n  'variableDefinitions', 'typeCondition', 'directives', 'selectionSet'],\n  IntValue: [],\n  FloatValue: [],\n  StringValue: [],\n  BooleanValue: [],\n  NullValue: [],\n  EnumValue: [],\n  ListValue: ['values'],\n  ObjectValue: ['fields'],\n  ObjectField: ['name', 'value'],\n  Directive: ['name', 'arguments'],\n  NamedType: ['name'],\n  ListType: ['type'],\n  NonNullType: ['type'],\n  SchemaDefinition: ['directives', 'operationTypes'],\n  OperationTypeDefinition: ['type'],\n  ScalarTypeDefinition: ['description', 'name', 'directives'],\n  ObjectTypeDefinition: ['description', 'name', 'interfaces', 'directives', 'fields'],\n  FieldDefinition: ['description', 'name', 'arguments', 'type', 'directives'],\n  InputValueDefinition: ['description', 'name', 'type', 'defaultValue', 'directives'],\n  InterfaceTypeDefinition: ['description', 'name', 'directives', 'fields'],\n  UnionTypeDefinition: ['description', 'name', 'directives', 'types'],\n  EnumTypeDefinition: ['description', 'name', 'directives', 'values'],\n  EnumValueDefinition: ['description', 'name', 'directives'],\n  InputObjectTypeDefinition: ['description', 'name', 'directives', 'fields'],\n  DirectiveDefinition: ['description', 'name', 'arguments', 'locations'],\n  SchemaExtension: ['directives', 'operationTypes'],\n  ScalarTypeExtension: ['name', 'directives'],\n  ObjectTypeExtension: ['name', 'interfaces', 'directives', 'fields'],\n  InterfaceTypeExtension: ['name', 'directives', 'fields'],\n  UnionTypeExtension: ['name', 'directives', 'types'],\n  EnumTypeExtension: ['name', 'directives', 'values'],\n  InputObjectTypeExtension: ['name', 'directives', 'fields']\n};\nexport var BREAK = Object.freeze({});\n/**\n * visit() will walk through an AST using a depth first traversal, calling\n * the visitor's enter function at each node in the traversal, and calling the\n * leave function after visiting that node and all of its child nodes.\n *\n * By returning different values from the enter and leave functions, the\n * behavior of the visitor can be altered, including skipping over a sub-tree of\n * the AST (by returning false), editing the AST by returning a value or null\n * to remove the value, or to stop the whole traversal by returning BREAK.\n *\n * When using visit() to edit an AST, the original AST will not be modified, and\n * a new version of the AST with the changes applied will be returned from the\n * visit function.\n *\n *     const editedAST = visit(ast, {\n *       enter(node, key, parent, path, ancestors) {\n *         // @return\n *         //   undefined: no action\n *         //   false: skip visiting this node\n *         //   visitor.BREAK: stop visiting altogether\n *         //   null: delete this node\n *         //   any value: replace this node with the returned value\n *       },\n *       leave(node, key, parent, path, ancestors) {\n *         // @return\n *         //   undefined: no action\n *         //   false: no action\n *         //   visitor.BREAK: stop visiting altogether\n *         //   null: delete this node\n *         //   any value: replace this node with the returned value\n *       }\n *     });\n *\n * Alternatively to providing enter() and leave() functions, a visitor can\n * instead provide functions named the same as the kinds of AST nodes, or\n * enter/leave visitors at a named key, leading to four permutations of\n * visitor API:\n *\n * 1) Named visitors triggered when entering a node a specific kind.\n *\n *     visit(ast, {\n *       Kind(node) {\n *         // enter the \"Kind\" node\n *       }\n *     })\n *\n * 2) Named visitors that trigger upon entering and leaving a node of\n *    a specific kind.\n *\n *     visit(ast, {\n *       Kind: {\n *         enter(node) {\n *           // enter the \"Kind\" node\n *         }\n *         leave(node) {\n *           // leave the \"Kind\" node\n *         }\n *       }\n *     })\n *\n * 3) Generic visitors that trigger upon entering and leaving any node.\n *\n *     visit(ast, {\n *       enter(node) {\n *         // enter any node\n *       },\n *       leave(node) {\n *         // leave any node\n *       }\n *     })\n *\n * 4) Parallel visitors for entering and leaving nodes of a specific kind.\n *\n *     visit(ast, {\n *       enter: {\n *         Kind(node) {\n *           // enter the \"Kind\" node\n *         }\n *       },\n *       leave: {\n *         Kind(node) {\n *           // leave the \"Kind\" node\n *         }\n *       }\n *     })\n */\n\nexport function visit(root, visitor) {\n  var visitorKeys = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : QueryDocumentKeys;\n\n  /* eslint-disable no-undef-init */\n  var stack = undefined;\n  var inArray = Array.isArray(root);\n  var keys = [root];\n  var index = -1;\n  var edits = [];\n  var node = undefined;\n  var key = undefined;\n  var parent = undefined;\n  var path = [];\n  var ancestors = [];\n  var newRoot = root;\n  /* eslint-enable no-undef-init */\n\n  do {\n    index++;\n    var isLeaving = index === keys.length;\n    var isEdited = isLeaving && edits.length !== 0;\n\n    if (isLeaving) {\n      key = ancestors.length === 0 ? undefined : path[path.length - 1];\n      node = parent;\n      parent = ancestors.pop();\n\n      if (isEdited) {\n        if (inArray) {\n          node = node.slice();\n        } else {\n          var clone = {};\n\n          for (var _i2 = 0, _Object$keys2 = Object.keys(node); _i2 < _Object$keys2.length; _i2++) {\n            var k = _Object$keys2[_i2];\n            clone[k] = node[k];\n          }\n\n          node = clone;\n        }\n\n        var editOffset = 0;\n\n        for (var ii = 0; ii < edits.length; ii++) {\n          var editKey = edits[ii][0];\n          var editValue = edits[ii][1];\n\n          if (inArray) {\n            editKey -= editOffset;\n          }\n\n          if (inArray && editValue === null) {\n            node.splice(editKey, 1);\n            editOffset++;\n          } else {\n            node[editKey] = editValue;\n          }\n        }\n      }\n\n      index = stack.index;\n      keys = stack.keys;\n      edits = stack.edits;\n      inArray = stack.inArray;\n      stack = stack.prev;\n    } else {\n      key = parent ? inArray ? index : keys[index] : undefined;\n      node = parent ? parent[key] : newRoot;\n\n      if (node === null || node === undefined) {\n        continue;\n      }\n\n      if (parent) {\n        path.push(key);\n      }\n    }\n\n    var result = void 0;\n\n    if (!Array.isArray(node)) {\n      if (!isNode(node)) {\n        throw new Error('Invalid AST Node: ' + inspect(node));\n      }\n\n      var visitFn = getVisitFn(visitor, node.kind, isLeaving);\n\n      if (visitFn) {\n        result = visitFn.call(visitor, node, key, parent, path, ancestors);\n\n        if (result === BREAK) {\n          break;\n        }\n\n        if (result === false) {\n          if (!isLeaving) {\n            path.pop();\n            continue;\n          }\n        } else if (result !== undefined) {\n          edits.push([key, result]);\n\n          if (!isLeaving) {\n            if (isNode(result)) {\n              node = result;\n            } else {\n              path.pop();\n              continue;\n            }\n          }\n        }\n      }\n    }\n\n    if (result === undefined && isEdited) {\n      edits.push([key, node]);\n    }\n\n    if (isLeaving) {\n      path.pop();\n    } else {\n      stack = {\n        inArray: inArray,\n        index: index,\n        keys: keys,\n        edits: edits,\n        prev: stack\n      };\n      inArray = Array.isArray(node);\n      keys = inArray ? node : visitorKeys[node.kind] || [];\n      index = -1;\n      edits = [];\n\n      if (parent) {\n        ancestors.push(parent);\n      }\n\n      parent = node;\n    }\n  } while (stack !== undefined);\n\n  if (edits.length !== 0) {\n    newRoot = edits[edits.length - 1][1];\n  }\n\n  return newRoot;\n}\n\nfunction isNode(maybeNode) {\n  return Boolean(maybeNode && typeof maybeNode.kind === 'string');\n}\n/**\n * Creates a new visitor instance which delegates to many visitors to run in\n * parallel. Each visitor will be visited for each node before moving on.\n *\n * If a prior visitor edits a node, no following visitors will see that node.\n */\n\n\nexport function visitInParallel(visitors) {\n  var skipping = new Array(visitors.length);\n  return {\n    enter: function enter(node) {\n      for (var i = 0; i < visitors.length; i++) {\n        if (!skipping[i]) {\n          var fn = getVisitFn(visitors[i], node.kind,\n          /* isLeaving */\n          false);\n\n          if (fn) {\n            var result = fn.apply(visitors[i], arguments);\n\n            if (result === false) {\n              skipping[i] = node;\n            } else if (result === BREAK) {\n              skipping[i] = BREAK;\n            } else if (result !== undefined) {\n              return result;\n            }\n          }\n        }\n      }\n    },\n    leave: function leave(node) {\n      for (var i = 0; i < visitors.length; i++) {\n        if (!skipping[i]) {\n          var fn = getVisitFn(visitors[i], node.kind,\n          /* isLeaving */\n          true);\n\n          if (fn) {\n            var result = fn.apply(visitors[i], arguments);\n\n            if (result === BREAK) {\n              skipping[i] = BREAK;\n            } else if (result !== undefined && result !== false) {\n              return result;\n            }\n          }\n        } else if (skipping[i] === node) {\n          skipping[i] = null;\n        }\n      }\n    }\n  };\n}\n/**\n * Creates a new visitor instance which maintains a provided TypeInfo instance\n * along with visiting visitor.\n */\n\nexport function visitWithTypeInfo(typeInfo, visitor) {\n  return {\n    enter: function enter(node) {\n      typeInfo.enter(node);\n      var fn = getVisitFn(visitor, node.kind,\n      /* isLeaving */\n      false);\n\n      if (fn) {\n        var result = fn.apply(visitor, arguments);\n\n        if (result !== undefined) {\n          typeInfo.leave(node);\n\n          if (isNode(result)) {\n            typeInfo.enter(result);\n          }\n        }\n\n        return result;\n      }\n    },\n    leave: function leave(node) {\n      var fn = getVisitFn(visitor, node.kind,\n      /* isLeaving */\n      true);\n      var result;\n\n      if (fn) {\n        result = fn.apply(visitor, arguments);\n      }\n\n      typeInfo.leave(node);\n      return result;\n    }\n  };\n}\n/**\n * Given a visitor instance, if it is leaving or not, and a node kind, return\n * the function the visitor runtime should call.\n */\n\nexport function getVisitFn(visitor, kind, isLeaving) {\n  var kindVisitor = visitor[kind];\n\n  if (kindVisitor) {\n    if (!isLeaving && typeof kindVisitor === 'function') {\n      // { Kind() {} }\n      return kindVisitor;\n    }\n\n    var kindSpecificVisitor = isLeaving ? kindVisitor.leave : kindVisitor.enter;\n\n    if (typeof kindSpecificVisitor === 'function') {\n      // { Kind: { enter() {}, leave() {} } }\n      return kindSpecificVisitor;\n    }\n  } else {\n    var specificVisitor = isLeaving ? visitor.leave : visitor.enter;\n\n    if (specificVisitor) {\n      if (typeof specificVisitor === 'function') {\n        // { enter() {}, leave() {} }\n        return specificVisitor;\n      }\n\n      var specificKindVisitor = specificVisitor[kind];\n\n      if (typeof specificKindVisitor === 'function') {\n        // { enter: { Kind() {} }, leave: { Kind() {} } }\n        return specificKindVisitor;\n      }\n    }\n  }\n}\n"],"names":[],"sourceRoot":""}