ESLint v9.9.0 released - ESLint - Pluggable JavaScript Linter
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
What's coming next for ESLint - ESLint - Pluggable JavaScript Linter
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
Introducing the ESLint Configuration Migrator - ESLint - Pluggable JavaScript Linter
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
ESLint v9.0.0 released - ESLint - Pluggable JavaScript Linter
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
ESLint v8.57.0 released - ESLint - Pluggable JavaScript Linter
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
What's coming in ESLint v9.0.0 - ESLint - Pluggable JavaScript Linter
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
Deprecation of formatting rules - ESLint - Pluggable JavaScript Linter
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
Flat config rollout plans - ESLint - Pluggable JavaScript Linter
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,
Preparing your custom rules for ESLint v9.0.0 - ESLint - Pluggable JavaScript Linter
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
ESLint v8.46.0 released - ESLint - Pluggable JavaScript Linter
Highlights Support for regular expressions v flag We have updated ESLint to fully support the ECMAScript 2024 regular expression v flag. This flag allows more complex operations such as difference/subtraction, intersection, and nested character classes. These updates include parsing and ensuring that rules related to regular expressions are behaving as expected. Better error messages for flat conf
ESLint v8.44.0 released - ESLint - Pluggable JavaScript Linter
Highlights The no-extra-parens rule has a new option ternaryOperandBinaryExpressions. eslint.config.js configuration files can now also export a promise that resolves to the configuration array. This can be useful for using ESM dependencies in CommonJS configuration files. The context.parserServices property is now deprecated in favor of SourceCode#parserServices. This change is part of the implem
ESLint v8.41.0 released - ESLint - Pluggable JavaScript Linter
Highlights Integrations can now use the new function shouldUseFlatConfig() to determine whether to use the FlatESLint class instead of the ESLint class. The performance of the indent rule has been significantly improved. Features 880a431 feat: change default ignore pattern to **/node_modules/ in flat config (#17184) (Milos Djermanovic) 8bf5505 feat: expose shouldUseFlatConfig (#17169) (Connor Prus
Announcing the ESLint Community GitHub organization - ESLint - Pluggable JavaScript Linter
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
ESLint's 2022 year in review - ESLint - Pluggable JavaScript Linter
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
ESLint v8.25.0 released - ESLint - Pluggable JavaScript Linter
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
ESLint v8.23.0 released - ESLint - Pluggable JavaScript Linter
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.
ESLint's new config system, Part 1: Background - ESLint - Pluggable JavaScript Linter
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
ESLint v8.20.0 released - ESLint - Pluggable JavaScript Linter
Highlights ESLint now catches exceptions thrown by preprocessors and reports them as lint errors. This matches how ESLint already handled parser errors. Previously, exceptions thrown by preprocessors would crash ESLint. Features ca83178 feat: catch preprocess errors (#16105) (JounQin) Bug Fixes 30be0ed fix: no-warning-comments rule escapes special RegEx characters in terms (#16090) (Lachlan Hunt)
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ESLint v8.9.0 released - ESLint - Pluggable JavaScript Linter
ESLint v8.8.0 released - ESLint - Pluggable JavaScript Linter