ESLint v3.8.0 released

Highlights

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

Additional Property on Linting Results

If you’re using the ESLint Node.js API or writing a custom formatter, you’ll find that result object for each file now has a source property. This property contains the original source code from the file, allowing formatters to output contextual information along with linting error messages. This new source property on the file results object is intended to replace the source property on the lint message object, which will be removed in a later release. If you have a custom formatter making use of the source property on the lint message object, we recommend updating your formatter to check for the existence of the source property on the file results object and to use it if found. See the documentation for more information.

New Rules

• func-name-matching

New Options

• comma-dangle … arrays, objects, imports, exports, and functions.
• space-before-function-paren … asyncArrow
• wrap-iife … functionPrototypeMethods

New autofixing

• curly
• no-lonely-if
• no-extra-bind
• one-var-declaration-per-line
• prefer-spread

Features

• cd72bba New: func-name-matching rule (fixes #6065) (#7063) (Annie Zhang)

Enhancements

• c8796e9 Update: comma-dangle supports trailing function commas (refs #7101) (#7181) (Toru Nagashima)
• c4abaf0 Update: space-before-function-paren supports async/await (refs #7101) (#7180) (Toru Nagashima)
• 5266793 Update: no-useless-escape checks template literals (fixes #7331) (#7332) (Kai Cataldo)
• b08fb91 Update: add source property to LintResult object (fixes #7098) (#7304) (Vitor Balocco)
• c1470b5 Update: Make the prefer-template fixer unescape quotes (fixes #7330) (#7334) (Teddy Katz)
• f8387c1 Update: add fixer for prefer-spread (#7283) (Teddy Katz)
• 52dfce5 Update: add fixer for one-var-declaration-per-line (#7295) (Teddy Katz)
• 0e994ae Update: Improve the error messages for no-unused-vars (fixes #7282) (#7315) (Teddy Katz)
• 72f394d Update: Fix false negative of no-multiple-empty-lines (fixes #7312) (#7313) (Teddy Katz)
• 756bc5a Update: Use characters instead of code units for max-len (#7299) (Teddy Katz)
• a12d1a9 Update: add fixer for no-lonely-if (#7202) (Teddy Katz)
• 2ffe516 Update: add fixer for curly (#7105) (Teddy Katz)
• ac3504d Update: add functionPrototypeMethods to wrap-iife (fixes #7212) (#7284) (Eli White)
• 5e16fb4 Update: add fixer for no-extra-bind (#7236) (Teddy Katz)

Bug Fixes

• d0d3b28 Fix: id-length rule incorrectly firing on member access (fixes #6475) (#7365) (Burak Yiğit Kaya)
• 2729d94 Fix: Don’t report setter params in class bodies as unused (fixes #7351) (#7352) (Teddy Katz)
• 5d08c33 Fix: Handle parentheses correctly in yoda fixer (fixes #7326) (#7327) (Teddy Katz)
• 55b5146 Fix: RuleTester didn’t support mocha --watch (#7287) (Toru Nagashima)
• 52da71e Fix: Don’t require commas after rest properties (fixes #7297) (#7298) (Teddy Katz)
• c9a7ec5 Fix: Improving optionator configuration for --print-config (#7206) (Kevin Partington)
• 51bfade Fix: avoid object-shorthand crash with spread properties (fixes #7305) (#7306) (Teddy Katz)
• 1418384 Fix: Don’t require semicolons before ++/-- (#7252) (Adrian Heine né Lang)

Documentation

• d840afe Docs: remove broken link from no-loop-func doc (#7342) (Michael McDermott)
• 16d495d Docs: Updating CLI overview with latest changes (#7335) (Kevin Partington)

Chores

• ee60acf Chore: add integration tests for autofixing (fixes #5909) (#7349) (Teddy Katz)
• 0b85004 Chore: Enable prefer-template (fixes #6407) (#7357) (Kai Cataldo)
• ca1947b Chore: Update pull request template (refs eslint/tsc-meetings#20) (#7359) (Brandon Mills)
• 0db4164 Chore: run prefer-template autofixer on test files (refs #6407) (#7354) (Kai Cataldo)
• 3b11d3f Chore: refactor no-multiple-empty-lines (#7314) (Teddy Katz)
• 93214aa Chore: Convert non-lib/test files to template literals (refs #6407) (#7329) (Kai Cataldo)