Migrate To ESLint 9 And @iobroker/eslint-config A Guide For IoBroker Developers

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Hey guys! 👋 If you're an ioBroker adapter developer, you've probably heard about the new ESLint 9 release. This is a heads-up to guide you through migrating to ESLint 9 and adopting the @iobroker/eslint-config, which is the new standard ESLint configuration provided by the ioBroker core team. Let’s dive into why this is important and how you can make the transition smoothly. This comprehensive guide will walk you through each step, ensuring your ioBroker adapters are up-to-date and adhering to best practices.

Why Migrate to ESLint 9 and @iobroker/eslint-config?

  • Stay Current: Keeping your tools updated ensures you benefit from the latest features, bug fixes, and performance improvements. ESLint 9 brings several enhancements that can help you write cleaner and more efficient code. ESLint 9 represents a significant step forward in code linting and formatting, offering improved performance, enhanced rule sets, and better compatibility with modern JavaScript features. By migrating, you ensure that your development environment is aligned with the latest standards, which can lead to more robust and maintainable code. Moreover, staying current with ESLint helps in identifying potential issues early in the development process, reducing the likelihood of bugs making their way into production. Embracing the newest version of ESLint also means access to a broader range of community support and resources, as most developers and libraries tend to focus on the latest versions. This ensures that you can leverage the collective knowledge and experience of the JavaScript community to tackle any challenges you might encounter. Additionally, updating to ESLint 9 can streamline your development workflow by integrating seamlessly with other modern tools and frameworks, enhancing overall productivity.
  • Standardized Configuration: The @iobroker/eslint-config provides a unified configuration for all ioBroker adapters. This means more consistent code quality across the board and easier collaboration with other developers. Using a standardized configuration like @iobroker/eslint-config ensures that all ioBroker adapters adhere to a consistent set of coding standards and best practices. This uniformity simplifies code reviews, reduces the cognitive load when working on different projects, and promotes a cohesive ecosystem. When all adapters follow the same rules, developers can easily contribute to multiple projects without needing to adjust to varying coding styles. Furthermore, a standardized configuration facilitates better integration between different components and services within ioBroker, as it minimizes the chances of compatibility issues arising from inconsistent code formatting or linting errors. The @iobroker/eslint-config also provides a solid foundation for maintaining code quality over time, making it easier to onboard new developers and ensuring that the project remains scalable and sustainable. This consistency ultimately translates into a more reliable and user-friendly experience for ioBroker users.
  • Community Best Practices: The rules in @iobroker/eslint-config are used (or will be) for all adapters maintained by the core team, ensuring they are well-reviewed and represent the best practices in the ioBroker ecosystem. Adopting the rules and configurations established by the ioBroker core team means that your adapters will benefit from the collective wisdom and experience of seasoned developers. These rules are meticulously crafted to catch common coding errors, enforce style consistency, and promote best practices in JavaScript development. By aligning your project with the @iobroker/eslint-config, you ensure that your code is not only compliant with the ecosystem’s standards but also optimized for performance, security, and maintainability. This alignment is particularly crucial in a collaborative environment like ioBroker, where multiple developers may contribute to a single adapter or project. Following the core team’s guidelines facilitates easier code reviews, smoother integration of contributions, and a more unified approach to problem-solving. Moreover, the continuous review and updates to the configuration mean that your adapter will stay current with the evolving best practices in the JavaScript community, ensuring long-term code quality and reliability. In essence, adopting the @iobroker/eslint-config is an investment in the sustainability and success of your ioBroker adapter.

Migration Guide: Step-by-Step

The ioBroker core team has published a detailed migration guide at https://github.com/ioBroker/ioBroker.eslint-config/blob/main/MIGRATION.md. Let’s break down the key steps to make sure you’re on the right track. This guide is designed to be as user-friendly as possible, so even if you're not an ESLint expert, you'll be able to follow along and get your project migrated smoothly.

1. Install @iobroker/eslint-config

First off, you need to install the @iobroker/eslint-config package as a development dependency in your project. Open your terminal, navigate to your adapter’s directory, and run the following command:

npm install --save-dev @iobroker/eslint-config eslint

This command adds @iobroker/eslint-config and ESLint to your project’s devDependencies. It’s crucial to install them as development dependencies because these tools are primarily used during development to ensure code quality and consistency. By including them in devDependencies, you ensure that they are not bundled with your production code, which helps keep your deployed application lean and efficient. Additionally, specifying these dependencies in your package.json file makes it easier for other developers to set up the project on their local machines, as they can simply run npm install to install all necessary development tools. This practice streamlines the onboarding process for new team members and helps maintain a consistent development environment across different machines. Moreover, using npm to manage your dependencies allows you to easily update and manage the versions of your ESLint configuration and ESLint itself, ensuring that you benefit from the latest improvements and security patches. Keeping your development dependencies up-to-date is a critical part of maintaining a healthy and efficient development workflow.

2. Configure ESLint

Next, you’ll need to configure ESLint to use the @iobroker/eslint-config. Create an .eslintrc.js file in the root of your project (if you don't have one already) and add the following:

module.exports = {
 extends: ['@iobroker/eslint-config'],
};

This configuration tells ESLint to extend the @iobroker/eslint-config, which includes all the standard rules and settings defined by the ioBroker core team. Using the extends property in your .eslintrc.js file is a powerful way to inherit a set of ESLint rules and configurations from a shareable configuration package. This approach promotes consistency across projects and simplifies the management of ESLint settings. By extending @iobroker/eslint-config, you ensure that your project adheres to the coding standards and best practices recommended by the ioBroker community. This not only improves the overall quality of your code but also facilitates easier collaboration with other developers who are familiar with these standards. The configuration file acts as a central hub for all ESLint settings, allowing you to customize or override specific rules as needed while still benefiting from the core configuration. This flexibility enables you to tailor the linting process to the unique requirements of your project without having to manage a complex set of individual rules. Furthermore, maintaining a clear and concise .eslintrc.js file makes it easier to understand and update your project's linting settings, reducing the risk of configuration errors and ensuring long-term maintainability.

3. Update your package.json

Update your package.json to include linting scripts. Add or modify the scripts section to include:

 "scripts": {
 "lint": "eslint .",
 "lint:fix": "eslint . --fix"
 }

These scripts make it easy to run ESLint and automatically fix many of the reported issues. By adding these scripts to your package.json, you streamline the process of running ESLint and applying automatic fixes to your code. The lint script executes ESLint on your project, flagging any violations of the configured rules and standards. This is crucial for maintaining code quality and consistency throughout the development lifecycle. The lint:fix script, on the other hand, goes a step further by automatically correcting many of the linting errors, such as formatting issues, unused variables, and other common problems. This can save a significant amount of time and effort, as it reduces the need for manual corrections. Integrating these scripts into your workflow encourages developers to regularly check and fix their code, leading to a more polished and maintainable codebase. Moreover, having these scripts readily available makes it easier to integrate linting into your continuous integration (CI) pipeline, ensuring that code quality is automatically verified with every commit. This practice not only helps catch issues early but also promotes a culture of code excellence within your development team. By making linting and fixing a simple, one-step process, you empower your team to produce high-quality code efficiently.

4. Run Linting

Now, run the linting command to see what issues are flagged:

npm run lint

This command will run ESLint and display any linting errors or warnings in your project. Running the npm run lint command is a crucial step in ensuring the quality and consistency of your codebase. This command triggers ESLint to analyze your project’s JavaScript and TypeScript files, identifying any deviations from the configured rules and coding standards. The output provides a detailed report of issues, including the file name, line number, and a description of the problem. This information allows you to quickly locate and address the issues, ensuring that your code adheres to best practices. Regular execution of this command, especially before committing changes, helps prevent the introduction of linting errors into the codebase. This proactive approach not only improves the overall quality of your code but also reduces the likelihood of encountering more complex issues later in the development process. Furthermore, the feedback provided by ESLint can serve as a valuable learning tool for developers, helping them understand and internalize coding best practices. By addressing linting issues promptly, you maintain a clean and maintainable codebase, which ultimately contributes to a more efficient and collaborative development environment. Integrating npm run lint into your daily workflow is a simple yet powerful way to uphold high coding standards and foster a culture of code excellence.

5. Fix Issues Automatically

Many issues can be automatically fixed by running:

npm run lint -- --fix

This command will attempt to automatically fix any linting issues that ESLint can handle. Using the npm run lint -- --fix command is an incredibly efficient way to address a wide range of linting issues in your codebase. This command extends the basic linting process by instructing ESLint to automatically correct many of the detected violations, such as formatting inconsistencies, unused variables, and other common style-related problems. By adding the --fix flag, you empower ESLint to apply these corrections directly to your files, saving you significant time and effort compared to manual fixes. The automatic fixing capability is particularly useful for enforcing consistent coding styles across large projects, where minor discrepancies can accumulate and become challenging to manage. After running the command, it’s always a good practice to review the changes made by ESLint to ensure they align with your intentions and do not introduce any unintended side effects. While automatic fixes can resolve many issues, some more complex problems may still require manual intervention. However, by automating the resolution of common linting errors, you can focus your attention on more critical aspects of code quality and design. Integrating npm run lint -- --fix into your development workflow not only enhances the efficiency of your coding process but also contributes to a more polished and maintainable codebase.

6. Manual Adjustments

For issues that can’t be automatically fixed, you’ll need to address them manually. This might involve tweaking your code or adjusting your ESLint configuration if you feel a rule is too strict for your specific needs. Manually addressing linting issues that cannot be automatically fixed by ESLint is a crucial step in ensuring the overall quality and integrity of your codebase. These issues often require a deeper understanding of the code and the underlying problem, as they may involve logical errors, complex stylistic deviations, or violations of best practices that are beyond the scope of automated correction. When faced with such issues, it’s essential to carefully analyze the reported error or warning and determine the most appropriate solution. This might involve refactoring code, rewriting sections to improve clarity and efficiency, or adjusting the ESLint configuration if a specific rule seems overly strict or inappropriate for your project’s needs. Making manual adjustments provides an opportunity to reflect on your coding practices and make informed decisions about how to improve your code. It also allows you to fine-tune the ESLint rules to strike the right balance between enforcing coding standards and accommodating the unique requirements of your project. While automatic fixes can handle many common issues, the manual adjustment process is where you can truly ensure that your code is not only compliant with the rules but also well-designed, maintainable, and robust. This hands-on approach to code improvement is a hallmark of professional software development.

Handling Prettier Issues

Prettier is a fantastic tool for code formatting, but it might report several issues during the migration. Most of these can be resolved by running npm run lint -- --fix. If you encounter persistent Prettier issues, ensure your Prettier configuration aligns with the @iobroker/eslint-config guidelines. Prettier is a powerful tool for automatically formatting code to adhere to a consistent style, which greatly enhances readability and reduces stylistic debates among developers. However, during the migration to ESLint 9 and @iobroker/eslint-config, you might encounter conflicts or issues reported by Prettier. These issues often stem from discrepancies between the existing code formatting and the standards enforced by Prettier and ESLint. The good news is that many of these conflicts can be resolved by running the npm run lint -- --fix command, which automatically applies fixes based on the configured ESLint rules, including those related to formatting. This command is a first line of defense for addressing Prettier issues, as it can correct a wide range of formatting inconsistencies. However, if you continue to encounter problems, it’s important to ensure that your Prettier configuration aligns with the guidelines set by @iobroker/eslint-config. This might involve reviewing your .prettierrc file (or equivalent) and making adjustments to match the recommended settings. Aligning your Prettier configuration with @iobroker/eslint-config ensures that your code formatting is consistent with the broader ioBroker ecosystem, facilitating easier collaboration and code maintenance. Additionally, resolving Prettier issues early in the migration process can prevent them from escalating into more significant problems later on, making the transition smoother and more efficient. By addressing formatting conflicts proactively, you maintain a clean and consistent codebase, which is crucial for long-term project success.

Customizing Rules and Excluding Files

While @iobroker/eslint-config is strongly recommended, you have the flexibility to adapt rules or exclude files if necessary:

  • Adapting Rules: If you feel a strong need to deviate from a specific rule, you can override it in your .eslintrc.js file. Just be sure to document why you’re making the exception. Adapting ESLint rules to suit the specific needs of your project is a powerful way to balance adherence to coding standards with the unique requirements of your codebase. While @iobroker/eslint-config provides a robust set of default rules designed to promote code quality and consistency, there may be situations where a particular rule does not align perfectly with your project’s architecture, legacy code, or development practices. In such cases, ESLint allows you to override individual rules within your .eslintrc.js file, providing a high degree of customization. When adapting rules, it’s essential to proceed thoughtfully and document the reasons behind your decision. This documentation serves as a valuable reference for other developers and helps maintain transparency regarding the deviations from the standard configuration. Overriding rules should be the exception rather than the norm, and it’s crucial to ensure that any changes do not compromise the overall quality or maintainability of the code. By carefully considering the impact of each rule adaptation and providing clear explanations, you can tailor ESLint to your project’s specific context while still benefiting from the core principles of the @iobroker/eslint-config. This flexibility ensures that your linting configuration remains a valuable tool that supports your development efforts without becoming a hindrance.
  • Excluding Files: For very old files or specific cases, you can exclude them from ESLint checks. However, try to keep this to a minimum to ensure comprehensive code quality. Excluding files from ESLint checks should be approached with caution, as it can create blind spots in your code quality assurance process. While @iobroker/eslint-config and ESLint are designed to promote consistent coding standards and identify potential issues, there may be specific circumstances where excluding certain files becomes necessary. Common scenarios include legacy code that is difficult to refactor, autogenerated files, or third-party libraries that do not adhere to your linting rules. However, it’s crucial to minimize the use of exclusions to maintain comprehensive code coverage. When excluding files, it’s important to document the reasons for the exclusion to ensure that other developers understand the rationale and to prevent the exclusions from becoming a permanent fixture without periodic review. Consider alternative solutions, such as refactoring the code or adjusting the ESLint rules, before resorting to exclusions. If you do exclude files, regularly reassess the need for the exclusion and, if possible, work towards bringing the excluded code back into compliance with your linting standards. By carefully managing file exclusions, you can strike a balance between practicality and maintaining a high level of code quality throughout your project.

Need Help?

If you have any questions during the migration, don’t hesitate to reach out to @iobroker-bot or the ioBroker community. We’re all here to help each other! Migrating to new technologies and standards can sometimes be challenging, and it’s perfectly normal to encounter questions or issues along the way. The ioBroker community is known for its supportive and collaborative nature, and there are numerous resources available to help you navigate the migration to ESLint 9 and @iobroker/eslint-config. One excellent resource is @iobroker-bot, which can provide guidance and answer your questions directly. Additionally, the ioBroker forums, chat channels, and other community platforms are filled with experienced developers who are eager to share their knowledge and assist with troubleshooting. Don’t hesitate to reach out and ask for help, as chances are that someone else has encountered a similar issue and can offer valuable insights. Remember, the goal is to create a smooth and successful migration process, and the collective expertise of the ioBroker community is a powerful asset. By leveraging the available support and engaging with your fellow developers, you can confidently tackle any challenges and ensure that your project benefits from the latest advancements in code linting and formatting. The ioBroker community thrives on collaboration, so don't hesitate to become an active participant in the migration journey.

Thanks for Maintaining Adapters!

A huge thank you to all adapter developers for your hard work and dedication. Your contributions are what make the ioBroker ecosystem so vibrant and successful. The ioBroker ecosystem is built on the foundation of a diverse and vibrant community of adapter developers, and your contributions are deeply valued. Maintaining adapters requires significant time, effort, and expertise, and your dedication to keeping these crucial components up-to-date and functioning smoothly is essential to the overall success of the platform. Each adapter you maintain not only provides specific functionality but also enriches the entire ioBroker experience for countless users. Your commitment to quality, innovation, and community collaboration makes ioBroker a powerful and versatile smart home platform. The time and energy you invest in fixing bugs, adding new features, and ensuring compatibility with the latest standards and technologies do not go unnoticed. Your hard work is what enables users to seamlessly integrate various devices and services into their smart home setups, creating a truly interconnected environment. Thank you for your passion, your skills, and your unwavering commitment to the ioBroker community. Your efforts are the driving force behind the platform’s continued growth and success. The ioBroker community thrives because of dedicated individuals like you who are willing to share their expertise and contribute to the collective good.

Let’s continue working together to provide the best user experience possible! 🚀 By embracing new standards like ESLint 9 and @iobroker/eslint-config, we ensure our adapters remain top-notch and our community thrives. The journey to providing the best user experience in the ioBroker ecosystem is a collaborative effort, and your active participation is vital to achieving this goal. By embracing new standards and technologies like ESLint 9 and @iobroker/eslint-config, we collectively elevate the quality and maintainability of our adapters, ensuring a more seamless and reliable experience for users. These standards not only enhance the technical aspects of our projects but also foster a sense of unity and consistency across the ioBroker platform. Working together, we can create a cohesive ecosystem where adapters integrate smoothly, code is easily understood and maintained, and users can confidently build their smart home solutions. Your willingness to adopt best practices, share knowledge, and engage with the community is what makes ioBroker so special. As we continue to innovate and adapt, let’s keep the focus on delivering the best possible user experience, knowing that our combined efforts will make a significant difference. By supporting each other and striving for excellence, we ensure that ioBroker remains a leading platform for smart home automation.