找不到模块“ @ angular-devkit / build-angular”

更新到Angular 6.0.1后，出现以下错误ng serve：

Could not find module "@angular-devkit/build-angular" from "/home/Projects/myProjectName".
Error: Could not find module "@angular-devkit/build-angular" from "/home/Projects/myProjectName".
    at Object.resolve (/home/Projects/myProjectName/node_modules/@angular-devkit/core/node/resolve.js:141:11)
    at Observable.rxjs_1.Observable [as _subscribe] (/home/Projects/myProjectName/node_modules/@angular-devkit/architect/src/architect.js:132:40)

ng update说一切都井井有条。删除node_modules文件夹和全新npm install安装也无济于事。

我的项目基于ng2-admin（Angular4版本）。这是我的package.json依赖项：

 "dependencies": {
    "@angular/animations": "^6.0.1",
    "@angular/common": "^6.0.1",
    "@angular/compiler": "^6.0.1",
    "@angular/core": "^6.0.1",
    "@angular/forms": "^6.0.1",
    "@angular/http": "^6.0.1",
    "@angular/platform-browser": "^6.0.1",
    "@angular/platform-browser-dynamic": "^6.0.1",
    "@angular/platform-server": "^6.0.1",
    "@angular/router": "^6.0.1",
    "@ng-bootstrap/ng-bootstrap": "1.0.0-alpha.26",
    "@ngx-translate/core": "^10.0.1",
    "@ngx-translate/http-loader": "^3.0.1",
    "amcharts3": "github:amcharts/amcharts3",
    "ammap3": "github:amcharts/ammap3",
    "angular-table": "^1.0.4",
    "angular2-csv": "^0.2.5",
    "angular2-datatable": "0.6.0",
    "animate.css": "3.5.2",
    "bootstrap": "4.0.0-alpha.6",
    "bower": "^1.8.4",
    "chart.js": "1.1.1",
    "chartist": "0.10.1",
    "chroma-js": "1.3.3",
    "ckeditor": "4.6.2",
    "core-js": "2.4.1",
    "easy-pie-chart": "2.1.7",
    "font-awesome": "4.7.0",
    "fullcalendar": "3.3.1",
    "google-maps": "3.2.1",
    "ionicons": "2.0.1",
    "jquery": "3.2.1",
    "jquery-slimscroll": "1.3.8",
    "leaflet": "0.7.7",
    "leaflet-map": "0.2.1",
    "lodash": "4.17.4",
    "ng2-ckeditor": "1.1.6",
    "ng2-completer": "^1.6.3",
    "ng2-handsontable": "^2.1.0-rc.3",
    "ng2-slim-loading-bar": "^4.0.0",
    "ng2-smart-table": "^1.0.3",
    "ng2-tree": "2.0.0-alpha.5",
    "ngx-uploader": "4.2.4",
    "normalize.css": "6.0.0",
    "roboto-fontface": "0.7.0",
    "rxjs": "^6.1.0",
    "rxjs-compat": "^6.1.0",
    "zone.js": "0.8.26"
  },
  "devDependencies": {
    "@angular/cli": "^6.0.1",
    "@angular/compiler-cli": "^6.0.1",
    "@types/fullcalendar": "2.7.40",
    "@types/jasmine": "2.5.38",
    "@types/jquery": "2.0.41",
    "@types/jquery.slimscroll": "1.3.30",
    "@types/lodash": "4.14.61",
    "@types/node": "6.0.69",
    "codelyzer": "3.0.1",
    "gh-pages": "0.12.0",
    "jasmine-core": "2.5.2",
    "jasmine-spec-reporter": "3.2.0",
    "karma": "1.4.1",
    "karma-chrome-launcher": "2.0.0",
    "karma-cli": "1.0.1",
    "karma-coverage-istanbul-reporter": "0.2.0",
    "karma-jasmine": "1.1.0",
    "karma-jasmine-html-reporter": "0.2.2",
    "npm-run-all": "4.0.2",
    "protractor": "5.1.0",
    "rimraf": "2.6.1",
    "standard-changelog": "1.0.1",
    "stylelint": "7.10.1",
    "ts-node": "2.1.2",
    "tslint": "5.2.0",
    "tslint-eslint-rules": "4.0.0",
    "tslint-language-service": "0.9.6",
    "typescript": "^2.7.2",
    "typogr": "0.6.6",
    "underscore": "1.8.3",
    "wintersmith": "2.2.5",
    "wintersmith-sassy": "1.1.0"
  }

和我的angular.json：

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "ng2-admin": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist",
            "index": "src/index.html",
            "main": "src/main.ts",
            "tsConfig": "src/tsconfig.app.json",
            "polyfills": "src/polyfills.ts",
            "assets": [
              "src/assets",
              "src/favicon.ico"
            ],
            "styles": [
              "node_modules/roboto-fontface/css/roboto/sass/roboto-fontface.scss",
              "node_modules/normalize.css/normalize.css",
              "node_modules/font-awesome/scss/font-awesome.scss",
              "node_modules/ionicons/scss/ionicons.scss",
              "node_modules/bootstrap/scss/bootstrap.scss",
              "node_modules/leaflet/dist/leaflet.css",
              "node_modules/chartist/dist/chartist.css",
              "node_modules/fullcalendar/dist/fullcalendar.css",
              "node_modules/handsontable/dist/handsontable.full.css",
              "node_modules/ng2-slim-loading-bar/style.css",
              "src/app/theme/theme.scss",
              "src/styles.scss"
            ],
            "scripts": [
              "node_modules/jquery/dist/jquery.js",
              "node_modules/easy-pie-chart/dist/jquery.easypiechart.js",
              "node_modules/jquery-slimscroll/jquery.slimscroll.js",
              "node_modules/tether/dist/js/tether.js",
              "node_modules/bootstrap/dist/js/bootstrap.js",
              "node_modules/handsontable/dist/handsontable.full.js",
              "node_modules/chroma-js/chroma.js"
            ]
          },
          "configurations": {
            "production": {
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "ng2-admin:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "ng2-admin:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "ng2-admin:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "karmaConfig": "./karma.conf.js",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "scripts": [
              "node_modules/jquery/dist/jquery.js",
              "node_modules/easy-pie-chart/dist/jquery.easypiechart.js",
              "node_modules/jquery-slimscroll/jquery.slimscroll.js",
              "node_modules/tether/dist/js/tether.js",
              "node_modules/bootstrap/dist/js/bootstrap.js",
              "node_modules/handsontable/dist/handsontable.full.js",
              "node_modules/chroma-js/chroma.js"
            ],
            "styles": [
              "node_modules/roboto-fontface/css/roboto/sass/roboto-fontface.scss",
              "node_modules/normalize.css/normalize.css",
              "node_modules/font-awesome/scss/font-awesome.scss",
              "node_modules/ionicons/scss/ionicons.scss",
              "node_modules/bootstrap/scss/bootstrap.scss",
              "node_modules/leaflet/dist/leaflet.css",
              "node_modules/chartist/dist/chartist.css",
              "node_modules/fullcalendar/dist/fullcalendar.css",
              "node_modules/handsontable/dist/handsontable.full.css",
              "node_modules/ng2-slim-loading-bar/style.css",
              "src/app/theme/theme.scss",
              "src/styles.scss"
            ],
            "assets": [
              "src/assets",
              "src/favicon.ico"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": []
          }
        }
      }
    },
    "ng2-admin-e2e": {
      "root": "",
      "sourceRoot": "",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "./protractor.conf.js",
            "devServerTarget": "ng2-admin:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],
            "exclude": []
          }
        }
      }
    }
  },
  "defaultProject": "ng2-admin",
  "schematics": {
    "@schematics/angular:component": {
      "prefix": "app",
      "styleext": "scss"
    },
    "@schematics/angular:directive": {
      "prefix": "app"
    }
  }
}

安装@angular-devkit/build-angular为开发依赖项。此软件包是Angular 6.0中新引入的

npm install --save-dev @angular-devkit/build-angular

要么，

yarn add @angular-devkit/build-angular --dev

npm update

它像魅力一样运作。

适用于角度6及以上

对我来说，有效的解决方案是

npm install

ng update

最后

npm update

需要明确获取devDependencies。

npm i --only=dev

如果以下命令不起作用，

npm install --save-dev @angular-devkit/build-angular

然后移至项目文件夹并运行以下命令：

npm install --save @angular-devkit/build-angular

以上所有答案都是正确的，但对我没有用。我能够进行这项工作的唯一方法是遵循以下步骤/命令：

npm uninstall -g @angular/cli@6.0.8
npm cache clean --force
npm install -g @angular/cli@latest
npm install node-sass -g
ng new MY_PROJECT_NAME
cp -r from_my_old_project to_new_MY_PROJECT_NAME

对于Angular 8

安装npm-check-updates软件包

跑：

$ npm i npm-check-updates
$ ncu -u
$ npm install

该软件包将更新所有软件包并解决此问题

注意：更新后如果遇到此问题：

Angular编译器中的错误需要TypeScript> = 3.4.0和<3.6.0，但是找到了3.6.3。

然后运行：

$ npm install typescript@3.5.3

源链接

npm install 只需键入npm install并运行，然后项目将无错误运行。或者你可以使用npm install --save-dev @angular-devkit/build-angular

以下对我有用。不幸的是，没有其他事情。

npm uninstall @angular-devkit/build-angular
npm install @angular-devkit/build-angular
ng update --all --allow-dirty --force

试试这个。

npm install

npm update

if it's shows something like this. 

运行npm audit fix修复它们，或npm audit获取详细信息

去做！

以下命令有效：

npm install
ng update

-您可能会看到消息“我们分析了您的package.json，一切似乎都井然有序。辛苦了！”

npm update

然后尝试开发

ng build 

我收到类型脚本错误，降级为

npm install typescript@">=3.1.1 <3.2

ng build --prod 

产品构建成功。

以下是工作组合

ng --version

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.11.0
@angular-devkit/build-angular     0.11.0
@angular-devkit/build-optimizer   0.11.0
@angular-devkit/build-webpack     0.11.0
@angular-devkit/core              7.1.0
@angular-devkit/schematics        7.1.0
@angular/cli                      7.1.0
@ngtools/webpack                  7.1.0
@schematics/angular               7.1.0
@schematics/update                0.11.0
rxjs                              6.3.3
typescript                        3.1.6
webpack                           4.23.1

我在上面进行了所有尝试，这是固定的方法：

->删除node_modules文件夹。

->终端-> npm安装。

希望这对您有所帮助！

我在Angular 7中遇到了同样的问题。只需执行以下命令即可解决错误。

npm install --save-dev @angular-devkit/build-angular

npm install --save-dev @angular-devkit/build-angular@latest

为我解决了。

只需执行以下命令即可解决错误

• ng update @angular/cli @angular/core
• npm uninstall @angular-devkit/build-angular

• npm install --save-dev @angular-devkit/build-angular

  如果以上命令无法解决此错误，请更新节点版本

  • npm更新npm -g

首先删除node_modules文件夹

然后重启系统

跑 npm install --save-dev @angular-devkit/build-angular

和

跑 npm install

当我们运行诸如之类的命令时ng serve，它使用@ angular / cli的本地版本。因此，首先在本地安装@ angular / cli的最新版本（不带-g标志）。然后使用ng update @angular/cli命令更新cli 。我认为这应该可以解决问题。谢谢

如果您要更新角度项目https://update.angular.io/，此链接可能会为您提供帮助

一分钟前，我遇到了同样的问题。我的项目是使用angular-cli 1.6.0版生成的。

1. npm update -g @angular/cli

2. editing my package.json changing the line
    "@angular/cli": "1.6.0",
      to
    "@angular/cli": "^1.6.0",

3. npm update

希望我的帮助有效effective

先尝试一下

npm install --save-dev @angular-devkit/build-angular

如果由于缺少包裹而再次出现错误，请尝试

npm install

这对我有用，提交然后：

ng update @angular/cli @angular/core
npm install --save-dev @angular/cli@latest

在将节点从v9升级到v10之后，今天我遇到了同样的问题。
我的环境由docker设置，我不得不从DockerFile中删除以下命令：

npm link @angular/cli

它创建一个符号链接到安装节点的目录。
我猜其中的angular/cli模块与我项目的node_modules目录中的模块版本不同，这会导致问题。

当角度项目未完全配置时，通常会发生此错误。

这会工作

npm install --save-dev @angular-devkit/build-angular

npm install

运行以下内容对我有用 npm audit fix --force

@angular-devkit/build-angular在您的开发依赖项下添加，它将起作用，或者您也可以执行

npm install --save-dev @angular-devkit/build-angular

删除package-lock.json并再次执行npm安装。它应该解决此问题。

**当您使用ng new创建了Angular 6应用程序并且安装了其他依赖项后，您会发现此错误，此修复更合适。

就我而言，问题是由于缺少依赖关系。为什么缺少依赖项，因为我忘记了打电话：

npm安装

调用上述命令后，所有必需的依赖项都将加载到node_modules中，这不再是问题

在CLI上执行以下命令：

• npm安装

• 删除node_modules。
• 使用'npm cache clean --verify'清除缓存。
• 然后再次安装npm。

对我来说就像一个魅力。

尝试这个。对我有用

npm uninstall -g @angular/cli
npm cache verify
npm install -g @angular/cli@next

不幸的是，所提供的解决方案都不适合我，但grepit的回答启发了我执行以下步骤。我通过操作系统（Windows 10）卸载了node.js，然后再次安装了它。然后安装了Angular CLI。然后创建一个新项目，并将我旧项目的src文件复制到这个新文件中，错误消失了。

以下是说明：

1. 通过操作系统卸载node.js并重新安装
2. npm install -g @angular/cli
3. 将您的项目重命名为YOUR_PROJECT_NAME.old
4. ng new YOUR_PROJECT_NAME
5. 运行此hello world项目（ng serve），以确保您不会收到该错误。
6. xcopy YOUR_PROJECT_NAME.old\src\*.* YOUR_PROJECT_NAME\src /s
   这是Windows版本的副本，请根据您自己的操作系统进行更改。