无法重新声明块范围变量“ngDevMode" [英] Cannot redeclare block-scoped variable 'ngDevMode'

问题描述

我的应用程序在 Angular 5 中.这是 package.json 的样子

My app in on Angular 5. Here is how the package.json looks like

{
  "name": "myapp",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.2.0",
    "@angular/common": "^5.2.0",
    "@angular/compiler": "^5.2.0",
    "@angular/core": "^5.2.0",
    "@angular/forms": "^5.2.0",
    "@angular/http": "^5.2.0",
    "@angular/platform-browser": "^5.2.0",
    "@angular/platform-browser-dynamic": "^5.2.0",
    "@angular/router": "^5.2.0",
    "@types/file-saver": "0.0.1",
    "angular-2-dropdown-multiselect": "^1.6.0",
    "angular2-csv": "^0.2.5",
    "bootstrap": "^3.3.7",
    "core-js": "^2.4.1",
    "file-saver": "^1.3.3",
    "ngx-bootstrap": "^1.9.3",
    "ngx-clipboard": "^8.1.0",
    "ngx-loading": "^1.0.14",
    "ngx-pagination": "^3.0.0",
    "ngx-toastr": "^6.4.0",
    "rxjs": "^5.5.6",
    "zone.js": "^0.8.19"
  },
  "devDependencies": {
    "@angular/cli": "~1.7.0",
    "@angular/compiler-cli": "^5.2.0",
    "@angular/language-service": "^5.2.0",
    "@types/jasmine": "~2.8.3",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "^4.0.1",
    "jasmine-core": "~2.8.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~2.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~4.1.0",
    "tslint": "~5.9.1",
    "typescript": "~2.5.3"
  }
}

到目前为止一切都很好.现在我需要在我的应用程序中使用日期选择器.所以我安装了angular-io-datepicker

Everything is fine so far. Now I need to use a datepicker in my app. So I installed angular-io-datepicker

npm install angular-io-datepicker --save

现在，当我执行 ng 服务时(在 app.module.ts 中包含 OverlayModule 和 DatePickerModule 之后)，它给了我以下错误

Now, when I do a ng serve (after including the OverlayModule and DatePickerModule in app.module.ts ), it gives me the below error

ERROR in node_modules/@angular/core/src/render3/ng_dev_mode.d.ts(9,11): error TS2451: Cannot redeclare block-scoped variable 'ngDevMode'.
node_modules/angular-io-overlay/node_modules/@angular/core/src/render3/ng_dev_mode.d.ts(9,11): error TS2451: Cannot redeclare block-scoped variable 'ngDevMode'.

关于什么地方可能出错以及如何修复它有什么建议吗?我早些时候在 Angular 4 中成功地使用了这个模块.然后我升级到 Angular 5 并且它坏了.现在即使我回滚到 angular 4，这个模块仍然给我同样的问题.

Any suggestions on what could be wrong and how to fix it? I was earlier using this module successfully with Angular 4. Then I upgraded to Angular 5 and it broke. Now even if I rollback to angular 4, this module still gives me the same problem.

推荐答案

我遇到了同样的错误，但我认为这是由对位于不同项目中的 Typescript 文件的引用引起的.我能够按照此处的建议解决问题:github 问题 24165.具体来说，我在项目根目录的 tsconfig.json 文件中的 compilerOptions 中添加了以下内容:

I ran into the same error, although I think it was caused by a reference to a Typescript file located in a different project. I was able to resolve the problem by following the advice here: github issues 24165. Specifically, I added the following to the compilerOptions in the tsconfig.json file in the root of my project:

"paths": {
  "@angular/*": ["node_modules/@angular/*"]
}

注意:如果您的基本路径不为空，则可能需要使用 ../node_modules.

Note: it may be necessary to use ../node_modules if your base path is not empty.

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