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Highlights Here are some of the key changes in this release. Experimental TypeScript configuration files Arya Emami landed experimental support for TypeScript configuration files. Specifically, you can now use eslint.config.ts, eslint.config.mts, and eslint.config.cts files as your configuration files. Because this feature is experimental, you’ll need to use the unstable_ts_config feature flag: np
When we released ESLint v9.0.0 in April, it was the first major release in 30 months and formally introduced the new configuration system. ESLint v9.0.0 also made some rule API changes to prepare the core for what’s coming next. After the release, we spent a lot of time creating compatibility utilities, a configuration migration tool, and a rule API transform utility to help the ecosystem move to
We’ve heard you: One of the biggest reasons ESLint users haven’t upgraded to ESLint v9.x is migrating a configuration file seems difficult and complicated. Some plugins support flat config and the ESLint v9.x rule APIs and some don’t. Sometimes you need to use FlatCompat and sometimes you need to use the compatibility utilities. While we cover as much as we can in the migration guide, it can take
The release of ESLint v9.0.0 brought with it the rollout of the new configuration system, but also a series of changes to the rules API. These changes are necessary in order to prepare ESLint for implementing language plugins, which will give ESLint the ability to natively lint languages other than JavaScript. As a result, plugin authors needed to update their rules to work with v9.0.0, and unfort
To address: If you are using any of these formatters via the -f command line flag, you’ll need to install the respective package for the formatter. Related issue(s): #17524 Removed require-jsdoc and valid-jsdoc rules The require-jsdoc and valid-jsdoc rules have been removed in ESLint v9.0.0. These rules were initially deprecated in 2018. To address: Use the replacement rules in eslint-plugin-jsdoc
As of ESLint v9,0.0, the new configuration system has reached general availability, bringing with it many benefits. Configuration files are now easier to manage and more transparent to compose. However, it can still be non-trivial to understand which rules are enabled and disabled for specific files, especially when your configuration is complex or composed from multiple sources. That’s why we are
Highlights This is a summary of the significant changes, both breaking and non-breaking, you need to know about when upgrading from ESLint v8.x to ESLint v9.0.0. Installing Because this is a major release, you may not automatically be upgraded by npm. To ensure you are using this version, run: npm i eslint@9.0.0 --save-dev Migration Guide As there are a lot of changes, we’ve created a migration gu
Highlights This release backports from v9.x to v8.x two new features and several bug fixes related to the flat config system to help plugins, integrations and users migrate to flat config ahead of the final v9.0.0 release. Support for eslint.config.mjs and eslint.config.cjs This release introduces support for eslint.config.mjs and eslint.config.cjs configuration files to v8.x in addition to eslint
Last month, the Technical Steering Committee (TSC) met to finalize the features for ESLint v9.0.0. This post outlines our plans for v9.0.0. You can keep up to date everything that is planned for v9.0.0 on our project board. Development plan Due to the large number of breaking changes planned for v9.0.0, we have decided to develop this release in two phases: Alpha. The alpha release will be compris
In ESLint v8.53.0, scheduled to be released on Friday, November 3, 2023, we will formally deprecate our formatting rules. Formatting rules are those rules that simply enforce code conventions around spacing, semicolons, string formats, etc. For a variety of reasons, which are discussed in this post, this is the right decision for ESLint going forward. However, to understand how we got here, it’s h
This config system is feature complete but not enabled by default. To opt-in, place an eslint.config.js file in the root of your project or set the ESLINT_USE_FLAT_CONFIG environment variable to true. To opt-out, even in the presence of an eslint.config.js file, set the environment variable to false. If you are using the API, you can use the configuration system described on this page by using the
It may seem hard to believe, but the RFC for ESLint’s new configuration system, nicknamed flat config, was first written in 2019. It took until 2022 (v8.21.0) for us to release an experimental, opt-in version of flat config. Since then, we’ve been making changes and improvements based on feedback from the community. The plan was always to allow the current configuration system, nicknamed eslintrc,
When ESLint v9.0.0 is released, it will ship with several breaking changes for rule authors. These changes are necessary as part of the work to implement language plugins, which gives ESLint first-class support for linting languages other than JavaScript. We’ve had to make these changes because ESLint has, from the start, assumed that it would only ever be used to lint JavaScript. As such, there w
The configuration migrator doesn’t yet work well for .eslintrc.js files. If you are using .eslintrc.js, the migration results in a config file that matches the evaluated output of your configuration and won’t include any functions, conditionals, or anything other than the raw data represented in your configuration. Start Using Flat Config Files The flat config file format has been the default conf
In our 2022 year in review, we briefly mentioned a couple of project kickoffs, and we’re excited to now announce the official eslint-community GitHub organization. The strength of ESLint is in its ecosystem, and we continue to investigate different ways of further supporting that community. We began by donating to community projects, to ensure that high-value projects were receiving the funds they
In February 2022, we shared our plan for 2022, including how the ESLint project as a whole would be spending its sponsorship money for the betterment of the project. In this post, I’ll share what we achieved during the year. Website redesign The most recognizable change to the project was undoubtedly the website redesign. The new website was officially launched on June 23 and was immediately met w
Highlights Formatters now have access to the --max-warnings threshold when it is exceeded. See Working with Custom Formatters - The context Argument for details. The new config system no longer supports .eslintignore files, --ignore-path CLI option and ignorePath API option, due to observed incompatibilities with ignores in eslint.config.js configuration files. For ignoring files in the new config
Highlights The new config system is now incorporated into the CLI, along with the existing config system. To opt-in to the new config system, place a eslint.config.js file in the root of your project. Please note that this is still an experimental feature and we welcome your feedback! The no-fallthrough rule has a new option allowEmptyCase. The no-warning-comments rule has a new option decoration.
In my previous post, I talked about how the eslintrc config system had grown to be more complex than necessary through a series of small, incremental changes. The flat config system, on the other hand, was designed from the start to be simpler in a number of ways. We took all of the learnings from the previous six years of ESLint development to come up with a holistic approach to configuration tha
When ESLint was first released in 2013, the config system was fairly simple. You could define the rules you wanted to enable or disable in a .eslintrc file. When a file was linted, ESLint would first look in the same directory as that file for a .eslintrc file and then continue up the directory hierarchy until reaching the root, merging configurations from all the .eslintrc files found along the w
You can configure ESLint to ignore certain files and directories while linting by specifying one or more glob patterns in the following ways: Inside of your eslint.config.js file On the command line using --ignore-pattern Ignoring Files In your eslint.config.js file, if an ignores key is used without any other keys in the configuration object, then the patterns act as global ignores. Here’s an exa
Published 09 Oct, 2021 under Release Notes ESLint v8.0.0 released We just pushed ESLint v8.0.0, which is a major release upgrade of ESLint. This release adds some new features and fixes several bugs found in the previous release. This release also has some breaking changes, so please read the following closely. Highlights There are several breaking changes in v8.0.0. We’ve created a migration guid
Published 24 Sep, 2021 under Release Notes ESLint v8.0.0-rc.0 released We just pushed ESLint v8.0.0-rc.0, which is a new prerelease version for ESLint v8. This release adds some new features and fixes several bugs found in the previous release. Highlights This is a summary of the major changes you need to know about for this version of ESLint. This version of ESLint is provided to gather feedback
Migrating to v8.0.0ESLint v8.0.0 is a major release of ESLint. We have made a few breaking changes in this release. This guide is intended to walk you through the breaking changes. The lists below are ordered roughly by the number of users each change is expected to affect, where the first items are expected to affect the most users. Table of ContentsBreaking changes for usersNode.js 10, 13, and 1
Highlights Most of the highlights of this release are breaking changes, and are discussed further in the migration guide. In addition, there are some new features: The default parser now supports ES2022 syntax, including class fields and top-level await. Some rules still need to be updated, and you can follow progress on the tracking issue. Autofix gained support for removing unused disable direct
Published 26 Sep, 2020 under Release Notes ESLint v7.10.0 released We just pushed ESLint v7.10.0, which is a minor release upgrade of ESLint. This release adds some new features and fixes several bugs found in the previous release. Highlights New option ignorePattern in the no-inline-comments rule. Enhancements 07d9bea Update: Add ignorePattern to no-inline-comments (#13029) (Edie Lemoine) Bug Fix
Published 31 Aug, 2020 under Release Notes ESLint v7.8.0 released We just pushed ESLint v7.8.0, which is a minor release upgrade of ESLint. This release adds some new features and fixes several bugs found in the previous release. Highlights Support for logical assignment operators and numeric separators has landed in ESLint! To enable linting this syntax, please set ecmaVersion to 2021: { "parserO
Published 13 Aug, 2020 under Sponsorships Microsoft donates $10,000 to ESLint as first FOSS Fund recipient We are happy to announce that Microsoft has donated $10,000 to ESLint, as part of their FOSS Contributor Fund. It is an honor to be supported by Microsoft and to be their first recipient. We are grateful to the software engineers, Jan Pilzer and Steve Faulkner, for nominating ESLint, and the
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