类型'typeof SyntaxKind'

Question

我已成功使用ts.SyntaxKind.NullKeyword检查是否使用了null关键字：

import * as ts from "typescript";
import * as Lint from "tslint";

if (right === ts.SyntaxKind.NullKeyword) {
     this.addFailure(this.createFailure(position, expressionWidth, Rule.EQ_FAILURE_STRING));
}

现在我想做同样的事情，除了未定义的关键字：

import * as ts from "typescript";
import * as Lint from "tslint";

if (right === ts.SyntaxKind.UndefinedKeyword) {
    this.addFailure(this.createFailure(position, expressionWidth, Rule.EQ_FAILURE_STRING));
}

但是当我这样做时，会出现此错误：

[ts] Property 'UndefinedKeyword' does not exist on type 'typeof SyntaxKind'.

我以为它是我的tslint版本还是我的typescript版本，但它们现在都没有那么旧了。

Package.json：

{
  "name": "classic-pm-frontend",
  "version": "0.1.1",
  "description": "",
  "main": "",
  "dependencies": {
    "@progress/kendo-ui": "2018.1.403",
    "adal-angular": "1.0.11",
    "angular": "1.5.8",
    "@types/lodash": "ts2.0",
    "angular-animate": "1.5.8",
    "angular-aria": "1.5.8",
    "angular-crumble": "0.2.2",
    "angular-drag-and-drop-lists": "1.4.0",
    "angular-local-storage": "0.2.7",
    "angular-material": "1.1.0",
    "angular-messages": "1.5.8",
    "angular-moment": "1.0.1",
    "angular-native-dragdrop": "1.2.2",
    "angular-resource": "1.5.8",
    "angular-route": "1.5.8",
    "angular-ui-tree": "2.22.2",
    "drag-drop-webkit-mobile": "1.2.0",
    "jquery": "3.1.1",
    "jsplumb": "2.2.10",
    "loader-utils": "1.1.0",
    "lodash": "^4.17.10",
    "moment": "2.14.1",
    "ng-infinite-scroll": "1.3.0",
    "ng-wig": "3.0.16",
    "npm": "5.8.0",
    "update": "0.7.4"
  },
  "devDependencies": {
    "angular-cli": "^1.0.0-beta.28.3",
    "angular-mocks": "1.5.8",
    "awesome-typescript-loader": "^5.2.0",
    "baggage-loader": "0.2.4",
    "copy-webpack-plugin": "2.1.6",
    "css-loader": "0.23.1",
    "exports-loader": "0.6.3",
    "expose-loader": "0.7.1",
    "express": "4.14.0",
    "extract-text-webpack-plugin": "^3.0.2",
    "file-loader": "0.8.5",
    "html-loader": "0.4.3",
    "html-webpack-plugin": "2.22.0",
    "imports-loader": "0.6.5",
    "jasmine-core": "2.4.1",
    "karma": "0.13.22",
    "karma-jasmine": "0.3.8",
    "karma-junit-reporter": "0.4.2",
    "karma-phantomjs-launcher": "1.0.1",
    "ngtemplate-loader": "1.3.1",
    "node-sass": "3.8.0",
    "normalize.css": "4.2.0",
    "phantomjs-prebuilt": "2.1.12",
    "rimraf": "2.5.4",
    "sass-loader": "3.2.3",
    "script-loader": "0.7.0",
    "source-map-loader": "0.1.5",
    "ts-loader": "0.8.2",
    "tslint": "^5.2.0",
    "tslint-loader": "^3.6.0",
    "typedoc": "0.7.1",
    "typescript": "^2.9.2",
    "typings": "1.3.2",
    "url-loader": "0.5.7",
    "webpack": "^3.12.0",
    "webpack-cli": "^3.1.0",
    "webpack-dev-server": "^3.1.5",
    "webpack-fail-plugin": "1.0.5"
  },
  "scripts": {
    "postinstall": "npm rebuild node-sass rimraf",
    "prepublish": "typings install",
    "build": "rimraf dist && webpack --progress --color",
    "build-watch": "webpack --progress --color --watch",
    "build-test": "webpack --config webpack.config.test.js --progress --color",
    "build-test-watch": "webpack --config webpack.config.test.js --progress --color --watch",
    "test": "karma start --single-run",
    "test-watch": "karma start --auto-watch",
    "dev": "webpack-dev-server --port 3000 --open --inline --content-base dist/",
    "docs": "rimraf distdoc && typedoc --out ./distdoc --tsconfig tsconfig.json --ignoreCompilerErrors 2> $null && exit 0",
    "typedoc": "typedoc -h"
  },
  "author": "Classic Group Ltd",
  "license": "UNLICENSED",
  "repository": {
    "type": "git",
    "url": "https://classicgroup.visualstudio.com/defaultcollection/_git/Classic%20PM%20Front%20End"
  }
}

如何消除错误