Upgrade to Angular 12: TypeScript is now an essential requirement for the Angular Compiler

Recently, I made sure to update my project to the latest Angular version. After running "ng update", I received a confirmation that everything was already up to date, indicating that all required packages had been successfully updated in the last step of the process.

However, when I attempted to serve the project, an unexpected error occurred:

Error: The Angular Compiler is requesting TypeScript version >=4.2.3 and <4.3.0, but it detected version 4.3.2 instead.

I have already attempted to resolve this by running 

npm install <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="52262b22372131203b222612667c617c62">[email protected]</a>
, only to find out that such a version does not exist. Downgrading is not preferred as I aim to keep my projects current. How can I tackle this issue?

angulartypescriptangular-cli

Answer №1

It has been noted in the comments that Angular currently only supports typescript 4.2. To install the latest supported version, use:

npm i <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e4909d94819787968d9490a4d0cad6">[email protected]</a>.*

If you are determined to utilize the newest typescript version, you can set the flag disableTypeScriptVersionCheck in your tsconfig (although this is not recommended): https://angular.io/guide/angular-compiler-options#disabletypescriptversioncheck

Answer №2

Angular 12 now requires Typescript version 4.2. Make sure to update your package.json accordingly:

    "typescript": "~4.2.3"

After making the changes, don't forget to run npm install.

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