You seem to not be depending on angular core This is an error

Question

I want to create an angular 2 App with angular cli  I have written in the cmd       npm install angular-cli -g    then      ng firstngapp   but it show me an error when I write npm start        I don t understand the problem

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Executing ng new --skip-install PROJECT NAME and then manually going into the created folder and typing npm install  https   github com angular angular-cli issues 3906

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In my case the following worked   rm -rf node modules rm package-lock json npm install   Hence the npm install  not update

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Delete node modules folder and package-lock json file   Then run following command it will update npm packages   npm update Later start project executing following command   ng serve   Above steps worked for me

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To solve this problem    Step1  cd projectName Step2  npm update Step3  ng serve -o   For example

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from terminal    gt  cd myProjectPath  myProjectPath  gt  npm install

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While running ng serve you should be in the app s project s directory    If you run the command in another directory you get the error      You seem to not be depending on   angular core   This is an error

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After trying to no avail    npm install npm update ng serve   npm install -g  angular cli worked for me

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I was getting the same error when I tried to run  ng serve  after that I saw some suggetions one of the techie told me to update my npm I did that as well then I got this screen after entering  ng server      Versions of  angular compiler-cli and typescript could not be determined  The most common reason for this is a broken npm install  Please make sure your package json contains both  angular compiler-cli and typescript in devDependencies  then delete node module and package-lock json if you have one  and  Run npm install again     After performing all the actions now its working correctly   and getting message  Compiled Successfully

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The problem I had was that I followed the cli s advice to switch to yarn package management   Then while following a tutorial I did npm install --save bootstrap  and after that point the error started appearing  Afterwards I did yarn add xxx of course and it worked   To restore the project s state I removed node modules and package-lock json as per this answer and then run yarn install

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This is how I solved this problem   I first ran npm install  angular core   Then I ran npm install --save   When both installs had successfully completed I ran npm serve and received an error saying    Versions of  angular compiler-cli and typescript could not be determined  The most common reason for this is a broken npm install   Please make sure your package json contains both  angular compiler-cli and typescript in devDependencies  then delete node modules and package-lock json  if you have one  and run npm install again     I then deleted my node modules folder as well as my package-lock json folder    After I deleted those folders I ran npm install --save once more    I ran npm start and received another error  This error said Error  Cannot find module   angular-devkit core    I ran npm install  angular-devkit core --save   Finally  I ran npm start and the project started

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I had the same issue and along with removing the node modules and reinstalling I needed to remove package-lock json first

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Below steps worked for me   1  Delete the node modules  folder and package-lock json file   2  npm install  3  ng serve

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Faced the same Issue  While running ngserve you should be in the apps directory  To confirm on GIT BASH   you will have  master  after the directory path at gitbash prompt  if you are at app directory

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Try to run  npm install   in the project folder

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You create new project with   ng new firstngapp   In your example you are missing new  This would create folder  generate files and run npm install for you  It seems that you ve created folder but there s no Angular CLI app in it   And for starting the app use   ng serve   npm start is only used if you have ejected from cli

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I got the same issue  and the reason is    when you run ng new app-name it will create a new directory with app name and install everything in that  after running the above command  human tendency is to run ng serve and because your app is in sub directory it will not find package json and throw the mentioned error    Solution is pretty simple  just move to the sub directory and then run ng serve

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This happened to me when I was mixing package managers  My project was generated with Yarn  and after that  I added a couple of dependencies using npm install  this created the package-lock json with only added dependencies     Apparently  ng serve used package-lock json and couldn t find Angular dependencies there  After I started using only Yarn  i e  yarn add instead of npm install  the error was gone

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May help you    Delete All folders you have created previously Create fresh folder  Then try navigate to that folder from command  cd foldername  then try to install  npm install    This will solve you problem

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Versions of  angular compiler-cli and typescript could not be determined  The most common reason for this is a broken npm install   Please make sure your package json contains both  angular compiler-cli and typescript in devDependencies  then delete node modules and package-lock json  if you have one  and run  npm install again

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Run the npm update after installing all peer dependencies and it will work

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If anyone is running into this in 2018  the thing that finally worked for me was to go into the my-app I created with ng new my-app  and THEN run ng serve This has to do with it needing the dependencies and devDependencies located in my-app package json instead of root package json  They are two separate files   Even if I copied the all the dependencies to my root folder s package json  I would also have to go in and manually change the path locations for the config files and such to go into my-app     It is much easier to just go into my-app  and run ng serve there to let it all work like it is supposed to   So these steps should work for anyone    rm -rf  lt previous-app gt     Whatever your previous app was called  if you had one   sudo rm -rf node modules  rm -f package-lock json  npm install  ng new my-app  cd my-app  ng serve

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Delete your node modules   Check your package json file should have the  angular core and reinstall it with npm i

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I don t know if it is still an issue  I was experiencing the same nuisance with  angular cli v1 1 2 on npm 4 1 2  I deleted the node modules directory and then went on to updating npm  since this was a common cause in the past    I wanted to upgrade npm to 5 0 3  latest  but since I was using nvm it seems to have messed up the libraries  Thus  I reinstalled node   Then  I went with   npm cache clean npm rebuild npm install - This one several times  since every time it threw an error with a different package   In the end  every package was fine   Hope this helps

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You need to run the ng server from the c  project angular-src location  Not just the root of your project

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You should be in the newly created YOUR APP folder before you hit the ng serve command     Lets start from fresh   1  install npm  2  create a new angular app   ng new  lt YOUR APP NAME gt     3  go to app folder  cd YOUR APP NAME   4  ng serve  I hope it will resolve the issue

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the fix for me was   npm link ng build

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For ng serve you need to be inside that directory  ashish ashish-Inspiron-3521   Angular  ng new FireStore   create FireStore README md  1025 bytes    create FireStore  angular-cli json  1245 bytes    create FireStore  editorconfig  245 bytes    create FireStore  gitignore  544 bytes    create FireStore src assets  gitkeep  0 bytes    create FireStore src environments environment prod ts  51 bytes    create FireStore src environments environment ts  387 bytes    create FireStore src favicon ico  5430 bytes    create FireStore src index html  296 bytes    create FireStore src main ts  370 bytes    create FireStore src polyfills ts  3114 bytes    create FireStore src styles css  80 bytes   ashish ashish-Inspiron-3521   Angular  ng serve You seem to not be depending on   angular core   This is an error    How I solved this using cmd  ashish ashish-Inspiron-3521   Angular  cd FireStore    Now Do cmd  ashish ashish-Inspiron-3521   Angular FireStore  ng serve    NG Live Development Server is listening on localhost 4200  open your browser on http   localhost 4200

[angular] You seem to not be depending on "@angular/core". This is an error

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