ESLint v10.0.0-rc.1 released

Highlights

This version of ESLint is not ready for production use and is provided to gather feedback from the community before releasing the final version. Please let us know if you have any problems or feedback by creating issues on our GitHub repo.

Note that this prerelease version of ESLint has a separate documentation section.

Espree and ESLint Scope now include types

Beginning with Espree v11.1.0 and ESLint Scope v9.1.0, these packages now contain built-in type definitions.

Previously, type definitions were provided by Definitely Typed packages @types/espree and @types/eslint-scope. There are several differences between the old and new type definitions, mostly bug fixes. If your code relies on types for the Espree and ESLint Scope packages, check if there are any updates needed.

Installing

Since this is a pre-release version, you will not automatically be upgraded by npm. You must specify the next tag when installing:

npm i eslint@next --save-dev
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You can also specify the version directly:

npm i eslint@10.0.0-rc.1 --save-dev
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Migration Guide

As there are a lot of changes, we’ve created a migration guide describing the breaking changes in great detail along with the steps you should take to address them. We expect that most users should be able to upgrade without any build changes, but the migration guide should be a useful resource if you encounter problems.

Features

• 43677de feat: fix handling of function and class expression names in no-shadow (#20432) (Milos Djermanovic)

Bug Fixes

• b34b938 fix: use Error.prepareStackTrace to estimate failing test location (#20436) (Francesco Trotta)
• 51aab53 fix: update eslint (#20443) (renovate[bot])
• 23490b2 fix: handle space before colon in RuleTester location estimation (#20433) (Francesco Trotta)
• f244dbf fix: use MessagePlaceholderData type from @eslint/core (#20348) (루밀LuMir)

Documentation

• 3e5d38c docs: add missing indentation space in rule example (#20446) (fnx)
• 63a0c7c docs: Update README (GitHub Actions Bot)

Chores

• 6742f92 test: add endLine/endColumn to invalid test case in no-alert (#20441) (경하)
• 3e22c82 test: add missing location data to no-template-curly-in-string tests (#20440) (Haeun Kim)