在 ng 服务命令上找不到 Builder@angle-devkit/build-angle: dev-server 的实现

我尝试在 这个之后更新角度 CLI，但是现在我不能运行我的应用程序。当我尝试运行命令 ng serve时，它会给我这个错误:

Could not find the implementation for builder @angular-devkit/build-angular:dev-server
Error: Could not find the implementation for builder @angular-devkit/build-angular:dev-server
at WorkspaceNodeModulesArchitectHost.resolveBuilder (C:\Users\Lupus\Documents\full-stack-projects\financial-app-ui\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\node-modules-architect-host.js:49:19)
at ServeCommand.initialize (C:\Users\Lupus\Documents\full-stack-projects\financial-app-ui\node_modules\@angular\cli\models\architect-command.js:135:55)
at process._tickCallback (internal/process/next_tick.js:68:7)
at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

我已经尽力了。

  • 我尝试使用 npm install --save-dev @angular-devkit/build-angular命令手动安装 devkit
  • 我尝试运行命令 npm i --only=dev
  • 我试着运行命令

:

npm install
ng update
npm update
  • 删除了 node_modules文件夹和 package-lock.json文件，并再次运行所有命令。

什么都没用，运行 ng v给了我这个:

Angular CLI: 8.0.3
Node: 10.15.0
OS: win32 x64
Angular: 8.0.1
... animations, cdk, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router


Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.13.9
@angular-devkit/build-angular     0.13.9
@angular-devkit/build-optimizer   0.13.9
@angular-devkit/build-webpack     0.13.9
@angular-devkit/core              7.3.9
@angular-devkit/schematics        8.0.3
@angular/cli                      8.0.3
@ngtools/webpack                  7.3.9
@schematics/angular               8.0.3
@schematics/update                0.800.3
rxjs                              6.5.2
typescript                        3.4.5
webpack                           4.29.0

我的包 Json 是这样的:

{
"name": "financial-app-ui",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "^8.0.1",
"@angular/cdk": "^8.0.1",
"@angular/common": "^8.0.1",
"@angular/compiler": "^8.0.1",
"@angular/core": "^8.0.1",
"@angular/forms": "^8.0.1",
"@angular/platform-browser": "^8.0.1",
"@angular/platform-browser-dynamic": "^8.0.1",
"@angular/router": "^8.0.1",
"core-js": "^2.6.9",
"font-awesome": "^4.7.0",
"primeicons": "^1.0.0",
"primeng": "^7.1.3",
"rxjs": "~6.5.2",
"tslib": "^1.10.0",
"zone.js": "~0.9.1"
},
"devDependencies": {
"@angular-devkit/build-angular": "^0.13.9",
"@angular/cli": "^8.0.3",
"@angular/compiler-cli": "^8.0.1",
"@angular/language-service": "^8.0.1",
"@types/jasmine": "~2.8.8",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~8.9.4",
"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": "~3.4.5"
}
}

还有人有其他建议吗？

266709 次浏览
小开

Make sure you have this configuration in your angular.json

    "serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"options": {
"browserTarget": "angular8:build"
},
"configurations": {
"production": {
"browserTarget": "angular8:build:production"
}
}
}

And make sure you have installed this package

@angular-devkit/build-angular
小开

I'm having the same issue, but in my case I am trying to serve a downloaded template of an Angular project. At first it gave me this error after a ng serve --open terminal command.

An unhandled exception occurred:

Could not find module "@angular-devkit/build-angular" from "D:\WORK\Desarrollo\plantillas descargadas\argon-dashboard-angular-master".

I solved that following this Stack Overflow question: https://stackoverflow.com/a/50333128, but got these warnings:

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN @ngtools/webpack@7.3.1 requires a peer of @angular/compiler-cli@>=5.0.0
<8.0.0 || ^7.0.0-beta.0 but none is installed. You must install peer dependencies
yourself.
npm WARN ajv-keywords@3.4.1 requires a peer of ajv@^6.9.1 but none is installed. You
must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9
(node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for
fsevents@1.2.9: wanted {"os":"darwin","arch":"any"} (current:
{"os":"win32","arch":"x64"})

But then I got this error after trying the command:

ng serve --open

An unhandled exception occurred: Could not find the implementation for builder @angular-devkit/build-angular:dev-server

I noticed that there were some files missing in my node_modules folder, probably caused by my current connection speed. Anyway I tried on a different computer, somewhere else, opened a clone of the project itself and ran the command:

npm update

then take the project in a .rar file to my working computer and decompressed it, run my VS Code and it just worked perfectly.

小开

ng update should have updated the version for your @angular-devkit/build-angular

I ran into this as well and what I did was created a new Angular app and ensured that ng serve was working fine for that newly created Angular app. I then copied and used the following from the working Angular app's package.json, which is:

`"@angular-devkit/build-angular": "~0.802.2",`

Ensure you run npm install

(The version would most probably change with each Angular update - so check what version you need to use by following the steps I have outlined - if ng update doesn't already update it for you)

小开

Resolved my issue by using the below command:

ng update @angular/cli @angular/core --allow-dirty --force
小开

I got this working by reinstalling the build-angular package. Note the '--save-dev' flag on the install command:

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

Since you got this error, you might be using an app which uses old version of angular dev such as 0.6.x

If you simply uninstall and reinstall , it's very likely that you got other errors like "cannot find module '@angular/compiler-cli/src/tooling'" or Cannot find module '@angular/compiler-cli/ngcc' because it seems that angular has been making a lot changes.

If you solved the problem simply by updating , then forget about the following.

It's best to use the next version(relative to 0.6.5) that doesn't cause the build error and ngcc error.

In my case, the correct version is between the build error and ngcc error.

小开

Double Check Versions: I looked at package.json & checked the all versions of all the Angular/Webkit programs, removing the ones giving me errors Typescript errors such as rxjs and googlemaps.

Remove the package-lock.json. Add all the correct versions of Angular, Webkit, Typescript, etc... checking to see what past versions render. This means looking through the Version history for packages on npmjs.com and matching by date / age and version numbers. Make the changes in package.json and save it.

"dependencies" {
"@agm/core": "1.0.0",
"@angular/cdk": "6.1.0",
"rxjs": "6.0.0",
"rxjs-compat": "6.0.0",
...
},
...
"devDependencies": {
"@angular-devkit/build-angular": "0.6.1",  // old: "^6.1.0",
"@angular/cli": "6.1.0",                   // new: "6.1.0",
"@angular/compiler-cli": "6.1.0",
"typescript": "2.7.2"
...
}

Start fresh by removing all the old modules:

rm -fR ./node_modules/@angular; rm -fR ./node_modules/@angular-devkit/; rm -fR ./node_modules/typescript; rm -fR ./node_modules/rxjs*; rm package-lock.json;

Then re-install: npm install;

.Pug Template Fix: I'm using a .pug loader so I had to manually patch: node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/common.js to allow Webpack to render Pug files. Add this line after the html rule inside that file:

{ test: /.pug$/, use: [ { loader: "apply-loader" }, { loader: "pug-loader" } ] },.

This is imitating what the ng-add-pug-loader.js file is doing to load .pug files in Angular version 6.

小开

I had the same problem. Just two command solved my problem

npm uninstall @angular-devkit/build-angular


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

If this doesn't work. don't worry. run this command.

ng update @angular/cli @angular/core --allow-dirty --force
小开

In angular.json change this line "builder": "@angular-builders/build-angular:browser", to "builder": "@angular-devkit/build-angular:browser", solved my problem.

小开

This worked for me.

First run update command ie. ng update

On running this you may get a list of other packages that should also be updated.

enter image description here

Install these packages manually as suggested.

After this on running ng serve I got error in angular.json for missing tsconfig.app.json file. These I added manually from this link . I also added tsconfig.spec.json file.

That is it, I ran ng serve again and the project complied successfully.

小开

I was able to solve this problem by installing the package @angular-devkit/build-angular using this command:

npm install @angular-devkit/build-angular --force
小开

If you have npm 7+ installed in your machine try this command in terminal:
npm install --legacy-peer-deps instead of npm install and then run ng serve.

I faced this same issue while running the projects build on older version but none of the solution above could help me. Finally, I found the solution and I am sharing it with you.


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