The error message "TypeError: The object prototype can only be an Object or null: undefined in Angular"

When trying to launch my web app using 'ng serve', I am encountering an error that I cannot seem to resolve. The error message is quite cryptic, and despite updating dependencies and searching through similar questions, I am still unable to pinpoint the exact cause. I am unsure if it is related to a compiler error, TypeScript, or a dependency issue.

[error] TypeError: Object prototype may only be an Object or null: undefined at setPrototypeOf () at Object.__extends (C:\Users\9090\Documents\project\FR\node_modules@angular\compiler-cli\node_modules\tslib\tslib.js:68:9) ... ... ... at Module._compile (internal/modules/cjs/loader.js:1138:30)

Below is an excerpt from my 'package.json' file:

    {
  "name": "Client",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    ...
    ...
    ...
    "typescript": "~3.4.5"
  }
}

Answer №1

In my opinion, trying to mix different major versions of the Angular package may not yield the desired results. It would be better to ensure that all Angular packages are updated to the same major version for optimal compatibility. Utilize syntax highlighting in WebStorm to easily identify and gather the latest versions.

Additionally, consider running the following command in your project folder:

ng update

This command will provide you with specific instructions on what needs to be updated.

Answer №2

To begin, review any outdated node modules in your project directory by executing the following command:

npm outdated

Upon running the outdated command, you will receive a list of packages that require updating.

If there are any outdated packages, proceed to upgrade them with the following command:

npm update --save/--save-dev

Answer №3

It's important to keep all dependencies up to date. Make sure to update packages like "rxjs" to version "6.6.0" and "typescript" to version "^3.9.6" for optimal performance.

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