Question

在我的Angular 4项目上运行ng build会出现此错误：

     14% building modules 40/46 modules 6 active ...es\@angular\http\@angular\http.es5.js
An error occured during the build:
Error: No module factory available for dependency type: ContextElementDependency
    at Compilation.addModuleDependencies (D:\dev\workspace\rep\node_modules\@angular\cli\node_modules\webpack\lib\Compilation.js:213:21)
    at Compilation.processModuleDependencies (D:\dev\workspace\rep\node_modules\@angular\cli\node_modules\webpack\lib\Compilation.js:202:8)
    at _this.buildModule.err (D:\dev\workspace\rep\node_modules\@angular\cli\node_modules\webpack\lib\Compilation.js:350:14)
    at building.forEach.cb (D:\dev\workspace\rep\node_modules\@angular\cli\node_modules\webpack\lib\Compilation.js:147:27)
    at Array.forEach (native)
    at callback

我在github＆amp;阅读了很多Q / A. stackoverflow在这个问题上，但没有帮助我。

正如答案所示，我已经删除了webpack，但这没有帮助。删除了node_modules，从package.json中删除了webpack，运行npm install，仍然没有帮助。清理了npm的缓存，从package.json中删除了webpack，运行npm install，仍然没有结果。许多其他类似的建议没有帮助。

当我从package.json中删除webpack并运行npm install时，我得到以下信息：

 Cannot find module 'webpack/lib/node/NodeTemplatePlugin' Error: Cannot
 find module 'webpack/lib/node/NodeTemplatePlugin'
     at Function.Module._resolveFilename (module.js:469:15)
     at Function.Module._load (module.js:417:25)
     at Module.require (module.js:497:17)
     at require (internal/module.js:20:19)
     at Object.<anonymous> (D:\dev\workspace\rep\node_modules\html-webpack-plugin\lib\compiler.js:11:26)
     at Module._compile (module.js:570:32)
     at Object.Module._extensions..js (module.js:579:10)
     at Module.load (module.js:487:32)
     at tryModuleLoad (module.js:446:12)
     at Function.Module._load (module.js:438:3)
     at Module.require (module.js:497:17)
     at require (internal/module.js:20:19)
     at Object.<anonymous> (D:\dev\workspace\rep\node_modules\html-webpack-plugin\index.js:7:21)
     at Module._compile (module.js:570:32)
     at Object.Module._extensions..js (module.js:579:10)
     at Module.load (module.js:487:32)

将webpack返回package.json时，运行npm install然后运行npm list webpack我得到以下结果：

+-- @angular/cli@1.4.7
| `-- webpack@3.6.0
`-- webpack@3.8.1

这是项目的package.json：

{
  "name": "somename",
  "version": "1.0.0",
  "description": "",
  "author": "",
  "url": "",
  "copyright": "somec",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "^4.4.5",
    "@angular/compiler": "^4.4.5",
    "@angular/core": "^4.4.5",
    "@angular/forms": "^4.4.5",
    "@angular/http": "^4.4.5",
    "@angular/platform-browser": "^4.4.5",
    "@angular/platform-browser-dynamic": "^4.4.5",
    "@angular/router": "^4.4.5",
    "@angular/upgrade": "^4.4.5",
    "amazon-cognito-identity-js": "^1.21.0",
    "chart.js": "2.7.0",
    "core-js": "2.5.1",
    "font-awesome": "^4.7.0",
    "jquery": "^3.2.1",
    "moment": "2.18.1",
    "ng2-charts": "1.6.0",
    "ngx-bootstrap": "1.9.3",
    "raw-loader": "^0.5.1",
    "rxjs": "5.4.3",
    "simple-line-icons": "^2.4.1",
    "ts-helpers": "1.1.2",
    "zone.js": "0.8.17"
  },
  "devDependencies": {
    "@angular/cli": "^1.4.7",
    "@angular/compiler-cli": "^4.4.5",
    "@types/jasmine": "2.6.0",
    "@types/jquery": "^3.2.13",
    "@types/node": "8.0.28",
    "codelyzer": "3.2.0",
    "jasmine-core": "2.8.0",
    "jasmine-spec-reporter": "4.2.1",
    "karma": "1.7.1",
    "karma-chrome-launcher": "2.2.0",
    "karma-cli": "1.0.1",
    "karma-coverage-istanbul-reporter": "1.3.0",
    "karma-jasmine": "1.1.0",
    "karma-jasmine-html-reporter": "0.2.2",
    "node-sass": "^4.5.3",
    "postcss-loader": "^2.0.6",
    "protractor": "5.1.2",
    "sass-loader": "^6.0.6",
    "ts-node": "3.3.0",
    "tslint": "5.7.0",
    "typescript": "2.5.2",
    "webpack": "^3.6.0"
  },
  "engines": {
    "node": ">= 6.9.0",
    "npm": ">= 3.0.0"
  }
}

当我在其他计算机上克隆此repo时，运行npm install然后ng build它没关系，工作正常，但在我的上面它会出现此错误。我已经尝试从我的计算机上完全删除了repo，从头开始克隆并运行npm install和ng build，仍然是同样的错误。

有人可以告诉我这种行为可能是什么原因以及如何解决这个问题？

Answer 1

如果遇到某人，我会采取措施解决此问题：

Package.json：从DevDependencies中删除webpack
rm -R node_modules（删除node_modules文件夹）
npm i -g webpack
npm i -g webpack-dev-server
删除package-lock.json（如果它在那里）
npm i
npm start

我仍然不完全理解发生这种情况的原因。

Answer 2

执行npm ls webpack

如果你看到两个版本的webpack（在@ angular / cli和root node_modules下），那就是问题所在。删除/重命名@angular/cli下的.bin @angular/cli文件夹中的网络包。

问题解决了我

Answer 3

所以我遇到了这个问题，我花了很长时间才弄清楚。我一直试图删除自己的node_modules目录，然后重新安装webpack。如果我在本地或全局安装webpack，则会收到ContextElementDependency错误。如果我卸载了webpack，我将找不到webpack。长话短说，对我来说问题是我的package-lock.json文件。所以我跑了 “ rm package-lock.json && rm -R node_modules” 然后我可以成功运行“ npm install”和“ npm start”。不要问我为什么这样做，但我希望这对某人有帮助。

Angular No模块工厂可用于依赖类型：ContextElementDependency

3 个答案: