ESLint v7.0.0-rc.0 released

Highlights

1. This release includes a new asynchronous ESLint API for use in Node.js environments. This will allow for the support of ES Module configuration files and plugins and is a prerequisite for implementing parallel linting.
2. Node.js and CommonJS core rules have been deprecated in favor of eslint-plugin-node.
3. The reported error location has been fine-tuned in a number of core rules.

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-rc.0 --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.

Enhancements

• 0b1d65a Update: Improve report location for array-callback-return (refs #12334) (#13109) (Milos Djermanovic)
• d3aac53 Update: report backtick loc in no-unexpected-multiline (refs #12334) (#13142) (Milos Djermanovic)
• bcafd0f Update: Add ESLint API (refs eslint/rfcs#40) (#12939) (Kai Cataldo)
• 5c1bdeb Update: Improve report location for getter-return (refs #12334) (#13164) (Milos Djermanovic)
• e7c1d4b Update: deprecate Node.js & CommonJS rules (#12898) (Kai Cataldo)
• af4472f Update: Improve report location for new-cap (refs #12334) (#13136) (Milos Djermanovic)
• a784dac Update: Improve report location newline-per-chained-call (refs #12334) (#13116) (Milos Djermanovic)
• 5e07574 Update: Improve report location for space-before-function-paren (#13128) (Chiawen Chen)
• 17e2fe4 Update: Improve error message for fatal fixer errors (#13120) (Brad Zacher)
• 438dcbb Update: Improve report location for comma-style (refs #12334) (#13111) (Chiawen Chen)
• 85b7254 Update: no-inner-declarations false negative in non-block (fixes #12222) (#13062) (Anix)
• 6631ef1 Update: Improve report location for no-empty-function (refs #12334) (#13121) (Milos Djermanovic)

Bug Fixes

• d85e291 Fix: yoda left string fix for exceptRange (fixes #12883) (#13052) (Anix)
• 8e7a2d9 Fix: func-call-spacing “never” reports wrong message (fixes #13190) (#13193) (Milos Djermanovic)
• ebc28d7 Fix: Remove default .js from --ext CLI option (#13176) (Brandon Mills)
• c9a5035 Fix: newBasePath should be an absolute path (fixes #12850) (#13078) (Nick Harris)
• 301b450 Fix: no-extra-parens export default sequence expression false positive (#13096) (Milos Djermanovic)
• bfa811c Fix: init error in extending recommended config (fixes #12707) (#12738) (YeonJuan)
• 7551f0c Fix: no check for shadowed Object (fixes #12809) (#13115) (Anix)
• 988d842 Fix: add end location to report in no-useless-concat (refs #12334) (#13110) (Milos Djermanovic)

Documentation

• 56d2bee Docs: fix typos (#13204) (Nitin Kumar)
• 516f253 Docs: Adds import example for object-curly-newline rule (refs #12018) (#13177) (Luke Lewis)
• b398e0b Docs: add rule comment in prefer-rest-params doc (#13191) (YeonJuan)
• c41de38 Docs: fix curly multi-or-nest examples with comments (refs #12972) (#13151) (Milos Djermanovic)
• 57221d5 Docs: fix eslint comment in no-inner-declarations examples (#13152) (Milos Djermanovic)
• 5dfd4eb Docs: examples with arrow functions in no-return-assign (fixes #13135) (#13138) (Anix)
• adc8fa8 Docs: clarify exceptions in spaced-comment (fixes #13032) (#13126) (Anix)
• b228f95 Docs: Update README team and sponsors (ESLint Jenkins)

Dependency Upgrades

• 3eeae56 Upgrade: some (dev) deps (#13155) (薛定谔的猫)
• 95e1c70 Upgrade: levn@0.4.1 (fixes #9366) (#13140) (Kai Cataldo)

Chores

• 2ce6bed Chore: added tests for nested arrays (#13145) (Anix)
• 6b7030b Chore: Run tests on Node.js v14 (#13210) (fisker Cheung)
• e13256e Chore: use espree.latestEcmaVersion in config-initializer (#13157) (Kai Cataldo)
• e4f57b7 Chore: add nested array tests for array-element-newline (#13161) (Anix)