ESLint v10.0.0-alpha.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 having any problems or feedback by creating issues on our GitHub repo.

Most of the highlights of this release are breaking changes, and are discussed further in the migration guide. There are summaries of the significant changes below. (Less significant changes are included in the migration guide.)

This prerelease version of ESLint has a separate documentation section.

Removed deprecated SourceCode methods

The following SourceCode methods are no longer available:

• getTokenOrCommentBefore() - Use getTokenBefore() with the { includeComments: true } option instead
• getTokenOrCommentAfter() - Use getTokenAfter() With the { includeComments: true } option instead
• isSpaceBetweenTokens() - Use isSpaceBetween() instead
• getJSDocComment() - No replacement

Users of plugins that haven’t updated their code yet can use the @eslint/compat utility in the meantime.

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-alpha.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.

Breaking Changes

• fa31a60 feat!: add name to configs (#20015) (Kirk Waiblinger)
• 3383e7e fix!: remove deprecated SourceCode methods (#20137) (Pixel998)
• 501abd0 feat!: update dependency minimatch to v10 (#20246) (renovate[bot])
• ca4d3b4 fix!: stricter rule tester assertions for valid test cases (#20125) (唯然)

Features

• 09e6654 feat: update error loc of require-yield and no-useless-constructor (#20267) (Tanuj Kanti)

Documentation

• 0f5a94a docs: [class-methods-use-this] explain purpose of rule (#20008) (Kirk Waiblinger)
• df5566f docs: add Options section to all rule docs (#20296) (sethamus)
• adf7a2b docs: no-unsafe-finally note for generator functions (#20330) (Tom Pereira)
• ef7028c docs: Update README (GitHub Actions Bot)
• fbae5d1 docs: consistently use “v10.0.0” in migration guide (#20328) (Pixel998)
• 778aa2d docs: ignoring default file patterns (#20312) (Tanuj Kanti)

Chores

• 0b14059 chore: package.json update for @eslint/js release (Jenkins)
• d6e7bf3 ci: bump actions/checkout from 5 to 6 (#20350) (dependabot[bot])
• 139d456 chore: require mandatory headers in rule docs (#20347) (Milos Djermanovic)
• 3b0289c chore: remove unused .eslintignore and test fixtures (#20316) (Pixel998)
• a463e7b chore: update dependency js-yaml to v4 [security] (#20319) (renovate[bot])
• ebfe905 chore: remove redundant rules from eslint-config-eslint (#20327) (Milos Djermanovic)
• 88dfdb2 test: add regression tests for message placeholder interpolation (#20318) (fnx)
• 6ed0f75 chore: skip type checking in eslint-config-eslint (#20323) (Francesco Trotta)