New rules:

• no-ignored-return Return values from functions without side effects should not be ignored #40
• elseif-without-else "if ... else if" constructs should end with "else" clauses #238
• no-gratuitous-expressions Boolean expressions should not be gratuitous #149
• generator-without-yield Generators should "yield" something #235
• no-nested-switch "switch" statements should not be nested #240
• no-nested-template-literals Template literals should not be nested #63
• no-empty-collection Empty collections should not be accessed or iterated #151
• non-existent-operator Non-existent operators '=+', '=-' and '=!' should not be used #234

Improvements:

• Improve highlighting for no-extra-arguments #178
• Improve prefer-immediate-return: keep comments when fixing #198
• Add meta.docs for each rule #246 (contributed by @Loxos)
• Indicate which rules are part of the preset, and which aren't #165
• Improve prefer-while: ignore 'for' without condition #196
• no-unused-collections should not fire if collection is exported #197 (contributed by @pustovitDmytro)
• Fix cognitive-complexity: consider JSX Fragment #245 (contributed by @Anuovec)

Thanks a lot to the contributions!