When I updated the ESLint plugin to support version 9, I did so in only the most minimal way. This ended up requiring that consumers install an additional package (`@eslint/eslintrc`) and use `FlatCompat` in their configurations. This change updates our plugin to actually be a modern plugin with modern shared configuration: - Each of our predefined config layers is itself a flat config. - Configs are exported as `plugin.configs.XXX`. - Our cascading glob configs have been updated to use `**/...`, which makes it properly detect said files no matter where they are. This means we no longer have to do things like unversally include tests globals, since the jasmine block will be loaded when its supposed to be. - Moved some things from `devDependencies` to `dependencies` to reduce what consumers have to install themselves. There are also some changes to the build process: - Use rollup instead of invoking babel directly. - Provide ESM and CJS exports in addition to UMD. - Generate and provide type definitions. I've also made a couple tweaks to the rules themselves: - Added some additional stuff to indent ignore rules to avoid issues with complex generic class definitions. - Switch ES6 `quotes` rule to use `@stylistic/quotes`. - Add a configuration for `@typescript-eslint/no-unused-vars` to match the JS one, and added underscore prefixes to allow us to ignore things even that aren't parameters or locals (for example, inside TS generic definitions). - Fixed links to `@stylistic` docs to link to the latest docs instead of an older version that we weren't even using. Testing Done: - Built the plugin. - Ran tests. - Used this from all of our other packages.