角度4到角度5找不到模块'@angular/router'

Question

• 我正在从 Angular 2 升级到 Angular 5。
• 升级后，我在 ts 文件中看到以下错误。
• 在 angular5 中是否需要删除 @angular/core 和 @angular/router
• 升级后还提供 package.json
• 在下面提供我的错误和代码 sn-p。
• 你能告诉我如何解决它吗？

错误

[ts] 找不到模块“@angular/core”。
[ts] 找不到模块“@angular/router”。

代码

import {Component, ElementRef, Input,Output,EventEmitter,Inject, OnInit,ViewChild} from '@angular/core';
import {KendoGridComponent} from '../grid/grid.component'
import { Router} from '@angular/router';

package.json

{
  "name": "SPORTS",
  "version": "1.0.0",
  "description": "SPORTS player - v0.2.37.1",
  "engines": {
    "node": "7.10.1"
  },
  "license": "ISC",
  "dependencies": {
    "@angular/animations": "^5.2.2",
    "@angular/common": "^5.2.2",
    "@angular/compiler": "^5.2.2",
    "@angular/compiler-cli": "^5.2.2",
    "@angular/core": "^5.2.2",
    "@angular/forms": "^5.2.2",
    "@angular/http": "^5.2.2",
    "@angular/platform-browser": "^5.2.2",
    "@angular/platform-browser-dynamic": "^5.2.2",
    "@angular/platform-server": "^5.2.2",
    "@angular/router": "^5.2.2",
    "@angular/upgrade": "2.0.0",
    "@ng-idle/core": "2.0.0-beta.2",
    "@ng-idle/keepalive": "2.0.0-beta.2",
    "@types/jquery": "^3.2.10",
    "@types/node": "^8.0.18",
    "@types/underscore": "^1.8.1",
    "@types/webpack": "^3.0.5",
    "angular2-in-memory-web-api": "0.0.21",
    "angular2-router-loader": "^0.3.5",
    "angular2-template-loader": "^0.6.2",
    "awesome-typescript-loader": "^3.2.1",
    "babel-minify-webpack-plugin": "0.2.0",
    "bootstrap": "^3.3.6",
    "commander": "^2.6.0",
    "compression-webpack-plugin": "1.0.1",
    "core-js": "^2.4.1",
    "css-loader": "^0.28.7",
    "del": "^3.0.0",
    "express": "^4.14.1",
    "extract-text-webpack-plugin": "^3.0.0",
    "file-loader": "^0.11.2",
    "file-saver": "^1.3.3",
    "html-webpack-plugin": "^2.30.1",
    "http-post": "^0.1.1",
    "http-proxy": "^1.8.1",
    "jquery": "2.2.3",
    "pako": "^1.0.5",
    "path": "^0.12.7",
    "raw-loader": "^0.5.1",
    "reflect-metadata": "^0.1.3",
    "require": "^2.4.20",
    "rxjs": "^5.5.6",
    "style-loader": "^0.18.2",
    "text-encoding-shim": "^1.0.0",
    "to-string-loader": "^1.1.5",
    "ts": "0.0.0",
    "typescript": "^2.4.2",
    "uglifyjs-webpack-plugin": "^0.4.6",
    "underscore": "^1.8.3",
    "webpack": "^3.5.6",
    "webpack-dev-server": "^2.7.1",
    "webpack-merge": "^4.1.0",
    "zone.js": "^0.6.23"
  },
  "devDependencies": {
    "gulp": "^3.9.1",
    "gulp-clean-css": "^3.8.0",
    "gulp-concat": "^2.6.1",
    "gulp-util": "^3.0.8",
    "jasmine-core": "~2.4.1",
    "jasmine-expect": "^3.0.1",
    "jasmine-jquery": "^2.1.1",
    "karma": "^1.2.0",
    "karma-chrome-launcher": "^0.2.3",
    "karma-cli": "^0.1.2",
    "karma-coverage": "^1.1.1",
    "karma-htmlfile-reporter": "^0.2.2",
    "karma-jasmine": "^0.3.8",
    "karma-jquery": "^0.1.0",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-typescript": "^2.1.4",
    "karma-typescript-preprocessor": "^0.3.0"
  },
  "main": "server.js",
  "scripts": {
    "dev": "webpack-dev-server --config  ./webpack.dev.js --inline --progress --color ",
    "postinstall": "webpack -p --config ./webpack.prod.js --progress --profile --bail",
    "start": "node server.js"
  },
  "repository": {
    "type": "git",
    "url": "https://github.iSPORTS.com/player-Replatform/webcomponent.git"
  }
}

Answer 1

您需要手动安装这些依赖项。

$ npm i @angular/core -s
$ npm i @angular/router -s

由于npm，我在升级时也遇到了同样的问题。我建议你改用 yarn。

Answer 2

1. 此错误来自编译器还是 Intellisense 等 IDE 工具？我发现有时像​​这样安装/分支切换 IDE 工具会让人感到困惑，需要重新启动 IDE。

2. 如果它无法编译，那么这些模块实际上是否在您的node_modules? 中如果没有，请删除您的package-lock.json 或shrinkwrap.json 并重新安装。 NPM 从 5.0 开始默认添加包锁，我发现复杂的依赖关系有时会搞砸。

3. 如果它们在那里，请再次运行 npm prune 和 npm install。

4. 如果这不起作用，请将node_modules 与任何锁定文件放在一起，然后重新安装。

5. 是否有任何第三方库需要更新？ Angular 5 有一些破坏性的 API 更改。如果是这种情况，请查看他们的文档。

6. 考虑纱线。

我很确定这是第一个，但我会留下我通常采取的所有步骤，只是为了完成。

Answer 3

确保在每个具有子模块的路由器模块中导出 RouterModule。在角度文档中，没有明确说明这是必要的——它只是包含在示例中——但这是必要的，正如人们在习惯性的几个小时的编辑-运行-叹息、编辑-运行-喊、编辑后发现的那样-run-google-editWithHope-scream-considerSmashingKeyboard、edit-run-cry、edit-run-solveByAccident-feelMomentaryPride（重复）。

结果：包括 RouterModule。元结果：注意官方文档中看似不必要的小代码。