从6迁移到7后，无法比较茉莉花中的枚举

Question

我正在将Angular应用程序从v6迁移到v7。除了对枚举进行比较的任何测试以外，其他一切都很好。当我运行测试时，会遇到很多关于枚举的错误，例如

ERROR in src/.../some-thing.component.spec.ts: error TS2345: Argument of type 'PlanDuration.SixMonths' is not assignable to parameter of type 'Expected<PlanDuration.TwelveMonths>'.

运行测试的示例如下所示：

export enum PlanDuration {
  SixMonths,
  TwelveMonths
}

...
    it('should toggle plan duration to six months if the event source id is the toggle duration and the event is not checked', () => {

      component.selectedPlanDuration = PlanDuration.TwelveMonths;
      component.handleToggle(event);
      expect(component.selectedPlanDuration).toBe(PlanDuration.SixMonths); // Tests cannot run because of errors here
    });

但是，如果我将枚举值转换为数字，则测试将完美运行！像这样在任何地方更新我的规格都不太理想：

expect(component.selectedPlanDuration).toBe(<number> PlanDuration.SixMonths);

我不确定我是否错过了一些东西package.json。我已经将一个新的angular 7项目与自己的项目进行了比较，并且它们之间的angular core，打字稿，茉莉花和业力版本相同。

如何获得测试以正确比较枚举？下面是我的package.json

"dependencies": {
    "@angular/animations": "~7.2.0",
    "@angular/common": "~7.2.0",
    "@angular/compiler": "~7.2.0",
    "@angular/core": "~7.2.0",
    "@angular/forms": "~7.2.0",
    "@angular/http": "~7.2.0",
    "@angular/platform-browser": "~7.2.0",
    "@angular/platform-browser-dynamic": "~7.2.0",
    "@angular/router": "~7.2.0",
    "core-js": "^2.5.4",
    "rxjs": "~6.4.0",
    "tslib": "^1.9.0",
    "zone.js": "~0.8.26",
    "@angular/cdk": "^7.0.3",
    "@angular/flex-layout": "7.0.0-beta.24",
    "@angular/material": "7.3.6",
    "hammerjs": "2.0.8",
    "intl": "1.2.5",
    "jshashes": "1.0.7",
    "lodash-es": "4.17.11",
    "request-promise-native": "1.0.5",
    "stream": "0.0.2",
    "timers": "0.1.1",
    "url-search-params-polyfill": "5.0.0",
    "xml2js": "0.4.19"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.13.0",
    "@angular/cli": "~7.3.7",
    "@angular/compiler-cli": "~7.2.0",
    "@angular/language-service": "~7.2.0",
    "@types/node": "~8.9.4",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.11.0",
    "typescript": "~3.2.2",
    "@types/lodash-es": "4.17.1",
    "gulp": "3.9.1",
    "gulp-stylelint": "7.0.0",
    "jasmine-data-provider": "2.2.0",
    "karma-cli": "1.0.1",
    "karma-junit-reporter": "1.2.0",
    "karma-parallel": "0.3.0",
    "karma-spec-reporter": "0.0.32",
    "lodash": "4.17.11",
    "moment": "2.22.2",
    "npm": "6.0.0",
    "protractor-beautiful-reporter": "1.2.5",
    "protractor-jasmine2-screenshot-reporter": "0.5.0",
    "stylelint": "9.6.0",
    "stylelint-order": "1.0.0",
    "tslint-jasmine-noSkipOrFocus": "1.0.9"
  }

tsconfig.json：

{
  "compileOnSave": false,
  "compilerOptions": {
    "importHelpers": true,
    "preserveConstEnums": true,
    "outDir": "./dist/out-tsc",
    "baseUrl": "src",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "noUnusedLocals": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2016",
      "dom"
    ]
  }
}

tsconfig.spec.json

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/spec",
    "module": "commonjs",
    "target": "es5",
    "baseUrl": "",
    "types": [
      "jasmine",
      "node"
    ]
  },
  "files": [
    "test.ts",
    "polyfills.ts"
  ],
  "include": [
    "**/*.spec.ts",
    "**/*.d.ts"
  ]
}

Answer 1

长话短说

快速修复：转到node_modules/@types/jasmine/index.d.ts，搜索type Expected

// Change this line:
// type Expected<T> = T | ObjectContaining<T> | Any | Spy;
// to:
type Expected<T> = any;

就是这样 ：）

欲了解更多详细信息，请阅读：

我相信这是茉莉花类型定义中的一个错误。我设置了一个新的 ng7 工作区并尝试重现您的问题。这是我的发现：

.d.ts工作区中有两个jasmine相关文件：

// package.json
  ...
  "@types/jasmine": "~2.8.8",
  "@types/jasminewd2": "~2.0.3",

我不是 100% 确定这两者如何协同工作，但它们为相同的 jasmine utils 声明了冲突的类型。例如：

// Change this line:
// type Expected<T> = T | ObjectContaining<T> | Any | Spy;
// to:
type Expected<T> = any;

// package.json
  ...
  "@types/jasmine": "~2.8.8",
  "@types/jasminewd2": "~2.0.3",

现在问题出在jasmine/index.d.ts.

这条线toBe(expected: Expected<T>)根本就是错误的。这是一个测试用例，当然您可以根据any值进行测试。然而Expected<T>被声明为某种复杂类型是没有意义的。

修复它的最简单方法是手动更正它。解决方案一开始就已经给出了。干杯。