ESLint v8.9.0 released

Highlights

• New es2022 environment has been added. When enabled, it adds all ECMAScript 2022 globals (which are currently the same as ECMAScript 2021 globals) and automatically sets the ecmaVersion parser option to 13. Previously, we used to add new ES environments only if they contain new globals compared to previous years. New es2016, es2018, and es2019 environments have also been added to fill in the gaps between years.
• eslint-scope has been updated to ignore "use strict" directives in ES3 code.
• eslint-visitor-keys package now contains built-in TypeScript declarations.

Features

• 68f64a9 feat: update eslint-scope to ignore "use strict" directives in ES3 (#15595) (Milos Djermanovic)
• db57639 feat: add es2016, es2018, es2019, and es2022 environments (#15587) (Milos Djermanovic)
• 2dc38aa feat: fix bug with arrow function return types in function-paren-newline (#15541) (Milos Djermanovic)
• 6f940c3 feat: Implement FlatRuleTester (#15519) (Nicholas C. Zakas)

Documentation

• 570a036 docs: add one-var example with for-loop initializer (#15596) (Milos Djermanovic)
• 417191d docs: Remove the $ prefix in terminal commands (#15565) (Andreas Lewis)
• 389ff34 docs: add missing Variable#scope property in the scope manager docs (#15571) (Milos Djermanovic)
• f63795d docs: no-eval replace dead link with working one (#15568) (rasenplanscher)
• 0383591 docs: Remove old Markdown issue template (#15556) (Brandon Mills)
• a8dd5a2 docs: add ‘when not to use it’ section in no-duplicate-case docs (#15563) (Milos Djermanovic)
• 1ad439e docs: add missed verb in docs (#15550) (Jeff Mosawy)

Chores

• 586d45c chore: Upgrade to espree@9.3.1 (#15600) (Milos Djermanovic)
• 623e1e2 chore: Upgrade to eslint-visitor-keys@3.3.0 (#15599) (Milos Djermanovic)
• 355b23d chore: fix outdated link to Code of Conduct in PR template (#15578) (Rich Trott)
• b10fef2 ci: use Node 16 for browser test (#15569) (Milos Djermanovic)
• 92f89fb chore: suggest demo link in bug report template (#15557) (Brandon Mills)