Encountering an issue post-upgrade with Angular 7 project

Currently, I am facing an issue with upgrading a project from Angular 6 to version 7. Despite following multiple online tutorials and successfully completing the upgrade process, I encountered an error when running the 'ng serve' command:

ERROR in The Angular Compiler requires TypeScript >=3.1.1 and <3.3.0 but 3.4.5 was found instead.

Lowering the TypeScript version to 3.1.1 resulted in numerous errors stemming from the node_modules folder. Any suggestions on how to resolve this issue would be greatly appreciated.

Thank you!

angulartypescript

Answer №1

Dealing with a similar issue, I found that running the following command fixed the problem by installing the necessary updated version:

npm install typescript@">=3.1.1 and <3.3.0"

Answer №2

It appears that your angular compiler version is outdated. I recommend updating to the latest version to resolve this issue.

To update, execute the command ng update. This will update your package.json file. Afterward, delete both the node_modules and npm-cache folders, then run npm install.

In my case, the most recent angular compiler versions are listed in the package.json as follows:

"@angular/compiler": "^8.0.3",
    "@angular/compiler-cli": "^8.0.3",

Answer №3

Make sure to keep your Typescript up to date by setting it to version 3.1.6 in the package.json file.

"typescript": "~3.1.6",

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