ESLint v7.0.0-alpha.1 released

We just pushed ESLint v7.0.0-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.

Highlights

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

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@7.0.0-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

• 4293229 Breaking: use-isnan enforceForSwitchCase default true (fixes #12810) (#12913) (Milos Djermanovic)
• cf38d0d Breaking: change default ignore pattern (refs eslint/rfcs#51) (#12888) (Toru Nagashima)
• bfe1dc4 Breaking: no-dupe-class-members checks some computed keys (fixes #12808) (#12837) (Milos Djermanovic)
• c2217c0 Breaking: make radix rule stricter (#12608) (fisker Cheung)

Enhancements

• 1ee6b63 Update: check template literal in yoda (fixes #12863) (#12876) (YeonJuan)
• 439c833 Update: array-callback-return checks Array.forEach (fixes #12551) (#12646) (Gabriel R Sezefredo)
• 03a69db Update: check template literal in no-proto, no-iterator (fixes #12801) (#12806) (YeonJuan)
• 562e784 Update: fix no-magic-numbers false negative with ignoreArrayIndexes (#12805) (Milos Djermanovic)
• 0460748 Update: check template literal in no-constant-condition (fixes #12815) (#12816) (YeonJuan)

Bug Fixes

• 1f1424c Fix: fix inconsistently works option in no-extra-parens (fixes #12717) (#12843) (YeonJuan)
• b5adcaa Fix: make YieldExpression throwable (fixes #12880) (#12897) (YeonJuan)
• 95e0586 Fix: id-blacklist false positives on renamed imports (#12831) (Milos Djermanovic)
• dadc892 Fix: operator-assignment crash on adjacent division assignment (#12844) (Milos Djermanovic)
• a9d92f9 Fix: radix rule crash on disabled globals (#12824) (Milos Djermanovic)
• 533c114 Fix: multiline-comment-style rule add extra space after * (fixes #12785) (#12823) (Karthik Priyadarshan)
• 80309c3 Fix: no-constant-condition doesn't introspect arrays (fixes #12225) (#12307) (Sean Gray)

Documentation

• f702b1a Docs: Add missing plugin reference (#12796) (Eduard Bardají Puig)
• 824d235 Docs: add errorOnUnmatchedPattern option to CLIEngine (#12834) (Arthur Denner)
• 33efd71 Docs: Fix spelling mistakes (#12861) (Bryan Mishkin)
• a5b3c5f Docs: Update README team and sponsors (ESLint Jenkins)
• d6c313d Docs: add missing eslint comments in prefer-regex-literals examples (#12858) (Milos Djermanovic)
• aea1729 Docs: Fix anchor links in Node.js API TOC (#12821) (Matija Marohnić)

Chores

• 1907e57 Chore: add Twitter and Open Collective badge (#12877) (Kai Cataldo)
• b7f0d20 Chore: Use consistent badge style (#12825) (fisker Cheung)
• 3734a66 Chore: use ids for messages (#12859) (Gareth Jones)
• 0cae920 Chore: rename shadowed global (#12862) (Tony Brix)
• 055b80d Chore: Fix typo in complexity.js (#12864) (Kyle Shevlin)
• 9f39ef0 Chore: typo in PULL_REQUEST_TEMPLATE.md (#12848) (Balázs Orbán)
• a60d5cd Chore: typo in no-irregular-whitespace.js (#12847) (Balázs Orbán)
• 691d19a Chore: add missing ecmaVersion 2020/11 type value (#12833) (Piotr Błażejewicz (Peter Blazejewicz))
• f5b9656 Chore: add test for no-constant-condition (#12836) (Milos Djermanovic)
• 10a79a6 Chore: Adopt eslint-plugin/require-meta-docs-description internally (#12762) (Bryan Mishkin)