Versions of @angular/compiler-cli and typescript could not be determined

Question

I have installed Angular/cli and then try to run command ng serve then below error is throwing. I have tried lot of thing like uninstall angular/cli, npm cache clean, etc

Answer 1

In the case of deployment, it is a good idea to add a preinstall script to address these gaps in dependencies:

"preinstall": "npm install @angular/cli @angular/compiler-cli typescript"

Answer 2

Also check these dependencies package.json:

...
"@angular/cli": "x.x.x",
"@angular/compiler": "^y.y.y",
"@angular/compiler-cli": "^z.z.z",
"typescript": "^t.t.t"
...

Hope this helps...

Answer 3

Please run the command

npm --production=false install

in your terminal. Also note that you should be in your project folder while executing this.

Answer 4

First, for prevent, update angular

npm install -g @angular/cli

Second, also the run "npm install", you must install dev dependencies

npm install --dev

verify dependencies are without error

ng --version

Answer 5

Could you check that your "@angular/compiler" in your dependencies is compatible with angular/cli version.

For example :

  "devDependencies": {
    "@angular/cli": "1.4.8",
    "@angular/compiler-cli": "4.4.6",

is compatible with :

"@angular/compiler": "4.4.6",