How to fix Cannot find module typescript in Angular 4

Question

I generated Angular 4 app 3 weeks ago using the  angular cli  After 2 weeks  I tried to run it with the command line ng serve but I am prompted an error below  Cannot find module  typescript  Error  Cannot find module  typescript      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  lt anonymous gt   C  Users mypc Documents Angular Projects my-angular-app node modules  angular cli models config config js 5 12      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   Do you have any idea how to fix this  Thanks

User · Accepted Answer

I was able to solve this problem by removing node modules then running npm install

User · Answer

Run  npm link typescript if you installed globally But if you have not installed typescript try this command  npm install typescript

User · Answer

I had a similar problem when I rearranged the folder structure of a project  I tried all the hints given in this thread but none of them worked   After checking further I discovered that I forgot to copy an important hidden file over to the new directory  That was      angular-cli json   from the root directory of the  angular cli project  After I copied that file over all was running as expected

User · Answer

Run  npm install  it will install all necessary pkg

User · Answer

I had a very similar problem after moving a working project to a new subdirectory on my file system  It turned out I had failed to move the file named  angular-cli json to the subfolder along with everything else  After noticing that and moving the file into the subdirectory  all was back to normal

User · Answer

I had the same problem  If you have installed first nodejs by apt and then you use the tar gz from nodejs org  you have to delete the folder located in  usr lib node modules

User · Answer

This should do the trick  npm install -g typescript

User · Answer

If you have cloned your project from git or somewhere then first  you should type npm install

User · Answer

If you use yarn instead of npm  you can install typescript package for that workspace by running   yarn add typescript   or you can install it globally by running   sudo yarn global add typescript   to be available for any project

User · Answer

If you don t have particular needs  I suggest to install Typescript locally    NPM Installation Method  npm install --global typescript   Global installation npm install --save-dev typescript   Local installation   Yarn Installation Method  yarn global add typescript   Global installation yarn add --dev typescript   Local installation

User · Answer

For me just running the below command is not enough  though a valid first step   npm install -g typescript  The following command is what you need  I think deleting node modules works too  but the below command is quicker  npm link typescript

[javascript] How to fix Cannot find module 'typescript' in Angular 4?

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