ESLint config only affects editor and not dev or prod environments

[thisismydesign]

• https://create-react-app.dev/docs/setting-up-your-editor/#displaying-lint-output-in-the-editor
• New Typescript linting overriding user config and causing build failure facebook/create-react-app#6871
• [eslint-config-react-app] Can't disable rule "@typescript-eslint/no-unused-vars" in config, outside of CRA facebook/create-react-app#6958

[thisismydesign]

After enabling EXTEND_ESLINT=true the cache needs to be cleared: facebook/create-react-app#9154 (comment)

[thisismydesign]

Check if enabling this overrides the whole config or they are merged. Check which plugins, extensions we should or shouldn't enable.

[thisismydesign]

Extending react-app does include rules from their config. However, for example, eslint-plugin-react show up as warnings instead of errors. Therefore it makes sense to override desired their setup (e.g. extend plugin:react/recommended explicitly).

[thisismydesign]

See fix for typescript: c-hive/cra-typescript-boilerplate@af7c07b