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I've installed:

  • node.js v15.6.0
  • npm 7.5.0
  • Angular CLI: 11.1.2

I'm running on Windows 10, 64bit.

I'm trying to create my first project by running:

ng new angular-demo

where "angular-demo" is project name. The command creates a project directory with some initial files, then it runs npm and fails with the following messages in the log file

67 verbose argv "W:\\nodejs\\node.exe" "C:\\Users\\Tomasz\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "install" "--quiet" 68 verbose node v15.6.0 69 verbose npm v7.5.0 70 error code ERESOLVE 71 error ERESOLVE unable to resolve dependency tree 72 error 73 error While resolving: [email protected] 73 error Found: [email protected] 73 error node_modules/typescript 73 error peer typescript@"~4.0.0 || ~4.1.0" from @angular-devkit/[email protected] 73 error node_modules/@angular-devkit/build-angular 73 error peer typescript@">=4.0 <4.2" from @angular/[email protected] 73 error node_modules/@angular/compiler-cli 73 error peer @angular/compiler-cli@"^11.0.0 || ^11.1.0-next" from @angular-devkit/[email protected] 73 error node_modules/@angular-devkit/build-angular 73 error peer @angular/compiler-cli@"11.1.1" from @angular/[email protected] 73 error node_modules/@angular/localize 73 error peerOptional @angular/localize@"^11.0.0 || ^11.1.0-next" from @angular-devkit/[email protected] 73 error node_modules/@angular-devkit/build-angular 73 error 1 more (ng-packagr) 73 error 1 more (ng-packagr) 73 error 73 error Could not resolve dependency: 73 error peer typescript@"~3.9.5" from [email protected] 73 error node_modules/tsickle 73 error peerOptional tsickle@"~0.39.0" from [email protected] 73 error node_modules/ng-packagr 73 error peerOptional ng-packagr@"^11.0.0 || ^11.1.0-next" from @angular-devkit/[email protected] 73 error node_modules/@angular-devkit/build-angular

I googled a bit and found that tsickle is some typescript-related tool and it supports only typescript version up to 3, not 4. I don't know why angular tries to install this combination of typescript version and tsickle.

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3 Answers 3

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4

This is dependency conflict as it says typescript version have issues. But even this error came there is a project folder is created. You can run

npm install --force

command from the project directory where the package.json file and initial file generated. For your case run the command under angular-demo directory

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Running npm install in the project folder gives the same error again. Edit: succeeded with --force
1

a solution that worked for me was a combination of the solution proposed by @ypolonsky ... but I added another step. The solution is to uninstall everything (even global node modules manually) and then reinstall Node.

I am working on a Windows 10 machine and the next steps solved the problem for me:

  1. First, delete all the content inside: C:\Users\your_user\AppData\Roaming\npm . This step is needed because this content is not deleted automatically on the uninstall process.
  2. Then, uninstall Node (you can do it from Control Panel)
  3. Open https://nodejs.org/en/download/ and select LTS latest version (as suggested by ypolonsky)
  4. Install Node
  5. Install the Angular cli: npm install -g @angular/cli
  6. Test creating a new Angular project again, it should work (the process takes some time so be patient): ng new my-app

In my case the problem probably was that I didn't updated Node from a long time and I have been doing a lot of updates (using ncu command) of my global packages as well, so a clean install was needed.

This post helped me to find out how to delete my node global modules: Command to remove all npm modules globally?

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0

I had similar error with nodejs 15.8.0 (npm 7.5.1).

When I uninstalled it and install LTS version of nodejs (currently 14.15.4 and npm 6.14.10) everything works fine. Open https://nodejs.org/en/download/ and select LTS latest version.

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