ESLint v6.0.0-alpha.1 released

Highlights

Most of the highlights of this release are breaking changes, and are discussed further in the migration guide.

New breaking changes in this prerelease include:

• Some config-loading bugs have been fixed. This change involved some refactoring to how config files are processed internally. Please let us know if you encounter any problems relating to configuration in this release.
• eslint:recommended has been updated
• no-redeclare has been made stricter

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

You can also specify the version directly:

npm i eslint@6.0.0-alpha.1 --save-dev

Migration Guide

If you’re upgrading from ESLint v5.x, we recommend looking at the migration guide, which describes the 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

• 6ae21a4 Breaking: fix config loading (fixes #11510, fixes #11559, fixes #11586) (#11546) (Toru Nagashima)
• 0fc8e62 Breaking: eslint:recommended changes (fixes #10768) (#11518) (薛定谔的猫)
• 20364cc Breaking: make no-redeclare stricter (fixes #11370, fixes #11405) (#11509) (Toru Nagashima)

Features

• 21dd211 New: add --resolve-plugins-relative-to flag (#11696) (Teddy Katz)

Bug Fixes

• 252efd3 Fix: delete unnecessary duplicated question (fixes #11617) (#11618) (HelloRusk)
• 1a3a88d Fix: Curly rule incorrectly flagging lexical declarations (fixes #11663) (#11675) (Brian Kurek)
• f47d72c Fix: not set ecmaVersion to 6 when sourceType=module (fixes #9687) (#11649) (薛定谔的猫)
• 9484e9e Fix: ignore return statements in dead code (fixes #11647) (#11688) (Toru Nagashima)
• aae6f65 Fix: don’t use deprecated API (#11689) (Toru Nagashima)
• e4400b5 Fix: require-atomic-updates false positive (fixes #11194, fixes #11687) (#11224) (Toru Nagashima)
• 776b0fe Fix: update rule message of no-throw-literal (fixes #11637) (#11638) (Pig Fang)
• 67c08b6 Fix: consider comments in object-curly-spacing (fixes #11656) (#11657) (Pig Fang)
• b6d41cb Fix: check token before using in no-cond-assign (fixes #11611) (#11619) (Pig Fang)
• 1dfe077 Fix: autofix of no-unneeded-ternary made syntax error (fixes #11579) (#11616) (Toru Nagashima)

Documentation

• e84b6f8 Docs: fix example in object-curly-newline docs (#11633) (golopot)
• 483239e Docs: updated ImportDeclaration in docs-rules-indent (#11679) (Alok Takshak)
• 4b3b036 Docs: replace var with const in code examples (#11655) (Niyaz Akhmetov)
• f2e7828 Docs: Fix Node 6 LTS EOL date (#11676) (James Ross)
• adc6585 Docs: update status of breaking changes in migration guide (#11652) (Teddy Katz)
• eef71e4 Docs: add missing items to migration guide (#11628) (Teddy Katz)
• bebd079 Docs: fix grammar mistake in no-caller docs (#11623) (Daniel Lemay)

Build Related

• f62a451 Build: add node 12 (#11648) (薛定谔的猫)

Chores

• f42d0af Chore: lazy loading for rules (#11705) (Toru Nagashima)
• f5bae78 Chore: fix CLIEngine tests when os.tmpdir is a symlink (#11697) (Teddy Katz)
• e4a08ba Chore: update eslint-plugin-node to 9.0.0 (#11670) (Toru Nagashima)
• 7f290a9 Chore: add eslint as a devDependeny (#11654) (Toru Nagashima)
• 139fd2f Chore: add markdownlint-cli (#11653) (Toru Nagashima)
• 8b4dba6 Chore: Add linting to git commit (#11556) (Nicholas C. Zakas)