How to Fix TypeError: this.getOptions is not a function

TypeError: this.getOptions is not a function error occurs while using Vue.js because due to a compatibility issue between “sass-loader@11.0.0 and vue@2.6.12.” The newer version of sass-loader may have included changes that were not compatible with the older version of Vue.js.

To fix the TypeError: this.getOptions is not a function error, downgrade sass-loader” to a compatible version which is “sass-loader@10.1.1”.

Here are the steps to downgrade the sass-loader.

Step 1: Uninstall the current version of sass-loader

npm uninstall sass-loader

Step 2: Install the compatible version (in this case, version 10.1.1) by running:

npm install sass-loader@10.1.1 --save-dev

Step 3: Ensure that your package.json file includes the compatible version:

"devDependencies": {
   "sass-loader": "^10"
}

Step 4: Restart your development server to ensure that the changes take effect

I hope these steps will fix your error!

Other possible common reasons for the error

  1. An object that is being used does not have the method that is being called.
  2. The method is misspelled
  3. The method name is incorrect
  4. Missing dependencies
  5. Scope issues

Other possible solutions

Here’s how to diagnose and possibly fix the issue:

Verify the Versions

Ensure you are using the appropriate versions of webpack and the loaders in your project. If you are using webpack 5, you should ensure all the loaders are compatible with this version.

Update Loader

The error may be coming from an outdated loader that’s not compatible with webpack 5. Update all your loaders to the latest versions compatible with webpack 5. For example:

npm install vue-loader@latest --save-dev

Check Configuration

If you have a custom webpack configuration in your Vue.js project, ensure it aligns with webpack 5’s API. Refer to the webpack 5 documentation and the documentation for any specific loaders or plugins you’re using.

Reinstall Node Modules

Sometimes, inconsistencies in the node_modules directory can lead to errors. Try deleting the node_modules directory and the package-lock.json or yarn.lock file, and then reinstall the dependencies:

rm -rf node_modules package-lock.json
npm install

Error occurs in Custom class

The error message “TypeError: this.getOptions is not a function” means that the getOptions property is not a function. This error can occur for a few reasons:

  1. The ‘getOptions’ property may not be defined.
  2. The ‘getOptions’ property may not be a function.
  3. The ‘getOptions’ property may not be accessible.

To fix this error, you will need to check your code and make sure that the getOptions property is defined and that it is a function. You will also need to make sure that the getOptions property is accessible.

class MyClass {
  constructor() {
    this.options = {}
  }

  getOptions() {
   // This is a function
   return function () {
     return this.options
   }
  }
}

I hope this will fix the error!

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