ESLint v5.0.0-alpha.1 released

We just pushed ESLint v5.0.0-alpha.1, 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.

Note: 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 or joining our Gitter channel.

Highlights

This is a summary of the major changes you need to know about for this version of ESLint.

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@5.0.0-alpha.1 --save-dev

Migration Guide

As there are a lot of changes, we've created a migration guide describing 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

• b2a48a9 Breaking: stop using fake context._linter property (fixes #10140) (#10209) (Teddy Katz)
• a039956 Breaking: remove deprecated browser/jest/node globals (fixes #10141) (#10210) (Teddy Katz)
• 2324570 Breaking: no-unused-vars reports all after-used params (fixes #9909) (#10119) (Kevin Partington)
• b77846d Breaking: drop supporting Node.js 4 (fixes #10052) (#10074) (薛定谔的猫)

Bug Fixes

• 218ee57 Fix: report no-case-declarations from declarations (fixes #10048) (#10167) (Carlo Abelli)

Documentation

• 98f1cad Docs: update migration guide with latest changes (#10212) (Teddy Katz)
• 71167be Docs: fix wrong config in id-length (#10196) (薛定谔的猫)
• 731da1e Docs: fix code in correct example. (#10195) (薛定谔的猫)
• 3780915 Docs: fix some small errors in examples (#10194) (薛定谔的猫)
• 1e7252f Docs: Add more related rules for object-curly-spacing (#10175) (Saugat Acharya)
• e5cf9cc Docs: Reorder README sections (#10172) (alberto)
• d0dc2e3 Docs: Add Missing Quotes (#10162) (Samarth Verma)

Dependency Upgrades

• f595fd8 Upgrade: upgrade deps (#10184) (alberto)
• 7765fc4 Upgrade: ajv@^6.0.1, still using json schema draft 04 (#9856) (Kevin Partington)
• 869c9f5 Upgrade: babelify (#10185) (alberto)
• b7ee1ed Upgrade: upgrade devdeps (#10178) (alberto)
• f3a0291 Upgrade: Update dependencies. (#10168) (alberto)
• 7d6e052 Upgrade: esquery@^1.0.1 (fixes #8733) (#10170) (Kevin Partington)
• 7a63bfa Upgrade: eslint-release to v0.11.1 (#10156) (Teddy Katz)

Build Related

• b7a1a7a Build: Gensite creates prerelease dirs if needed (#10154) (Brandon Mills)

Chores

• 2e60017 Chore: remove concat-stream dependency (#10173) (Teddy Katz)
• 7f69f11 Chore: rearrange init options. (#10131) (薛定谔的猫)
• 81629d2 Chore: enable rest/spread rules on ESLint codebase (#10211) (Teddy Katz)
• cd34d44 Chore: avoid modifying global state when tests fail (#10201) (Teddy Katz)
• db1a582 Chore: Add debug logging for CLI args as they came in (#10174) (Kevin Partington)
• c85578f Chore: Remove esprima-fb dependency. (#10171) (alberto)