Could not find the implementation for builder @angular-devkit/build-angular:dev-server on ng serve command
node.jsAngularNpmEcmascript 6Single Page-Applicationnode.js Problem Overview
I tried to update the angular CLI following this, but now I can't run my app. When I try to run the command ng serve
, it gives me this error:
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)
I have tried everything I could found.
- I tried to manually install devkit with the command
npm install --save-dev @angular-devkit/build-angular
- I tried to run the command
npm i --only=dev
- I tried to run the commands
:
npm install
ng update
npm update
- Removed the
node_modules
folder and thepackage-lock.json
file and ran the commands all again.
Nothing worked. Running ng v
gives me this:
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
And my package.json is like this:
{
"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"
}
}
Does anyone have any other suggestion?
node.js Solutions
Solution 1 - node.js
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
Solution 2 - node.js
Resolved my issue by using the below command:
ng update @angular/cli @angular/core --allow-dirty --force
Solution 3 - node.js
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)
Solution 4 - node.js
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
Solution 5 - node.js
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
Solution 6 - node.js
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.
Solution 7 - node.js
In angular.json change this line "builder": "@angular-builders/build-angular:browser",
to "builder": "@angular-devkit/build-angular:browser",
solved my problem.
Solution 8 - node.js
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.
Solution 9 - node.js
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.
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.
Solution 10 - node.js
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.
Solution 11 - node.js
me funciono instalando npm install --save-dev @angular-devkit/build-angular
Solution 12 - node.js
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