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[Solved] TypeError: this.libOptions.parse is not a function

To Fix TypeError: this.libOptions.parse is not a function Error you just need to downgrade eslint to 8.22.0 in typescript. In this article, we will try to figure out how this error occurs and what are the possible fixes for this error. First of all, let’s explore how this error occurs.

Solution 1: Downgrade eslint

This error occurs in eslint‘s latest version 8.23 and that is causing this error. To Fix TypeError: this.libOptions.parse is not a function Error you just need to downgrade eslint to the 8.22.0. First of all delete node_modules and package-lock.json by running this command

rm -rf node_modules; rm package-lock.json;

Now, install eslint 8.22.0 by using this command.

npm i eslint@8.22.0

Then, run npm install and now, your error will be solved. Thanks.

Solution 2: Follow this Step

First Of all Open Your package.json file and and then set ESLint version to 8.22.0.

"eslint": "8.22.0"

Now, You need to delete the node_modules folder. And then Delete the package-lock.json file too. OR You can use this command to delete node_modules folder and package-lock.json file.

rm -rf node_modules; rm package-lock.json;

Now, You need to install npm to get all dependencies Just run npm install in Your terminal.

npm install

And now, Your error will be solved. Thank You.

Solution 3: For Yarn Users

If You are using Yarn then You just need to run the following command in your terminal.

yarn add eslint@8.22.0 --save-exact

And just restart your project will resolve your error.

Frequently Asked Questions

  1. How To Fix TypeError: this.libOptions.parse is not a function Error?

    To Fix TypeError: this.libOptions.parse is not a function Error First Of all Open Your package.json file and and then set ESLint version to 8.22.0: “eslint”: “8.22.0” Now, You need to delete the node_modules folder. And then Delete the package-lock.json file too. OR You can use this command to delete node_modules folder and package-lock.json file: rm -rf node_modules; rm package-lock.json; Now, You need to install npm to get all dependencies Just run npm install in Your terminal: npm install And now, Your error will be solved. Thank You.

  2. TypeError: this.libOptions.parse is not a function

    This error is Occurs in eslint's latest version 8.23 and that is causing this error. To Fix TypeError: this.libOptions.parse is not a function Error you just need to downgrade eslint to the 8.22.0. First of all delete node_modules and package-lock.json by running this command: rm -rf node_modules; rm package-lock.json; Now, install eslint 8.22.0 by using this command: npm i eslint@8.22.0 Then, run npm install and now, your error will be solved. Thanks.

Conclusion

To fix this error you need to downgrade your eslint to the 8.22.0 and then your error will be fixed. Hope our article is helped you to solve this error. Comment below which solution is worked for you.

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