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

By default, npm install will install all modules listed as dependencies. With the --production flag, npm will not install modules listed in devDependencies. either we can go

First Way

for editing the dependency part in package.json by adding it with relevant version

    "dependencies": {
    /*existing part */

     "@angular/cli": "1.5.2",
    "@angular/compiler-cli": "^5.0.0",
    "typescript": "^2.4.2"
    }

Second Way

To install dev dependencies, npm --production=false install will work even with NODE_ENV=production.

Or you can run NODE_ENV=development npm install

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