API changes were announced in September 2023 and Eslint v9.0.0 is now available as of a couple weeks ago.

Additionally, there are some rule structure changes outlined separately that may be worth ensuring are in compliance.

Unfortunately, the following plugins are not compatible.

• Consoledot's @redhat-cloud-services/eslint-config-redhat-cloud-services https://issues.redhat.com/browse/RHCLOUD-32095
• PatternFly's eslint-plugin-patternfly-react https://github.com/patternfly/patternfly-react/issues/10282
• eslint-plugin-formatjs https://github.com/formatjs/formatjs/issues/4388
• eslint-plugin-testing-library https://github.com/testing-library/eslint-plugin-testing-library/issues/899

Useful docs

• Configuration migration guide
• Shared Configs
• typescript-eslint
• eslint-plugin-formatjs
• Migrate ESLint To The New Flat Configuration