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.<anonymous> (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.
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
.I was able to solve this problem by removing
node_modules
then runningnpm install
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.If you use
yarn
instead ofnpm
, you can installtypescript
package for that workspace by running:or you can install it globally by running:
to be available for any project.
For me just running the below command is not enough (though a valid first step):
The following command is what you need (I think deleting node_modules works too, but the below command is quicker)
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
from the root directory of the @angular/cli project. After I copied that file over all was running as expected.
Run ‘npm install’ it will install all necessary pkg .
This should do the trick,
If you have cloned your project from git or somewhere then first, you should type
npm install
.Run:
npm link typescript
if you installed globallyBut if you have not installed typescript try this command:
npm install typescript
If you don’t have particular needs, I suggest to install Typescript locally.
NPM Installation Method
Yarn Installation Method