Resolving NgModule Import Errors During Migration of Angular Project from Version 11 to 16

Currently, I am in the process of upgrading an existing Angular project from version 11 to version 16. The update went smoothly until I encountered a roadblock upon reaching version 16.

The main issue I am facing is that most of my modules are displaying the following error message:

"This import contains errors, which may affect components that depend on this NgModule."

Running on node version 16.16.0

Here is a snippet of my package.json file:

{
  "name": "fuse",
  "version": "11.0.0",
  "license": "https://themeforest.net/licenses/terms/regular",
  "scripts": {
    ...
  },
  "private": true,
  "dependencies": {
    ...
  },
  "devDependencies": {
    ...
  }
}

I am seeking assistance to understand why this error is occurring. Any insights or guidance on this matter would be greatly appreciated.

Answer №1

Angular has been compiled by Ivy since version 9. This error occurs when you compile your application with libraries that were built using the older Angular compiler, View Engine. Up until version 16, this was not a problem because Angular provided compatibility for these libraries to work with Ivy through a tool called ngcc.

However, ngcc is officially being removed in version 16 (https://github.com/angular/angular-cli/releases/tag/16.0.0), so you will need to either update these libraries to versions that are compatible with Angular Ivy or find replacements for them.

Check the console closely as it may suggest which libraries need to be addressed.

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