The Angular Compiler requires TypeScript >=2.7.2 and <2.8.0 but 2.8.3 was found instead

Question

I starting getting this error on my Angular app:

The Angular Compiler requires TypeScript >=2.7.2 and <2.8.0 but 2.8.3 was found instead

Answer 1

In your project folder run again npm install typescript@2.7.2 as stated from here:

Want to upgrade project from Angular v5 to Angular v6

Then it should work.

Answer 2

You should do npm install typescript@'>=2.7.2 <2.8.0'. This will install the correct typescript your project needs. Make sure you run this inside your Angular project.

On Windows, you should use double quotes instead of single quotes, like so:

npm install typescript@">=2.7.2 <2.8.0"

Otherwise, you'll get The system cannot find the file specified..

Answer 3

To upgrade, run the following commands in the terminal.

• Install the latest version of NPM

  npm install npm@latest -g
  

• Run audit

  npm audit  
  

• Update the NPM

  npm update
  

• Run the NPM run script.

  npm start
  

Now your compiler is ready.