Chore: Remove @eslint/compat and don't run all eslint rules in betterer (#97463)

* Remove eslint compat

* Remove fixup for testing library rules

* Make sure we don't ignore betterer eslint config from itself

* Update betterer to not run rules that are run in linting anyway

.betterer.eslint.config.js

@@ -1,8 +1,77 @@
 // @ts-check
+const emotionPlugin = require('@emotion/eslint-plugin');
+const importPlugin = require('eslint-plugin-import');
+const jestPlugin = require('eslint-plugin-jest');
+const jsxA11yPlugin = require('eslint-plugin-jsx-a11y');
+const lodashPlugin = require('eslint-plugin-lodash');
+const barrelPlugin = require('eslint-plugin-no-barrel-files');
+const reactPlugin = require('eslint-plugin-react');
+const testingLibraryPlugin = require('eslint-plugin-testing-library');
+
+const grafanaConfig = require('@grafana/eslint-config/flat');
+const grafanaPlugin = require('@grafana/eslint-plugin');
+
+// Include the Grafana config and remove the rules,
+// as we just want to pull in all of the necessary configuration but not run the rules
+// (this should only be concerned with checking rules that we want to improve,
+// so there's no need to try and run the rules that will be linted properly anyway)
+const { rules, ...baseConfig } = grafanaConfig;
+
 /**
  * @type {Array<import('eslint').Linter.Config>}
  */
 module.exports = [
+  {
+    name: 'grafana/betterer-ignores',
+    ignores: [
+      '.github',
+      '.yarn',
+      '**/.*',
+      '**/*.gen.ts',
+      '**/build/',
+      '**/compiled/',
+      '**/dist/',
+      'data/',
+      'deployment_tools_config.json',
+      'devenv',
+      'e2e/test-plugins',
+      'e2e/tmp',
+      'packages/grafana-ui/src/components/Icon/iconBundle.ts',
+      'pkg',
+      'playwright-report',
+      'public/lib/monaco/',
+      'public/locales/_build',
+      'public/locales/**/*.js',
+      'public/vendor/',
+      'scripts/grafana-server/tmp',
+      '!.betterer.eslint.config.js',
+    ],
+  },
+  {
+    name: 'react/jsx-runtime',
+    // @ts-ignore - not sure why but flat config is typed as a maybe?
+    ...reactPlugin.configs.flat['jsx-runtime'],
+  },
+  {
+    files: ['**/*.{ts,tsx,js}'],
+    ...baseConfig,
+    plugins: {
+      ...baseConfig.plugins,
+      '@emotion': emotionPlugin,
+      lodash: lodashPlugin,
+      jest: jestPlugin,
+      import: importPlugin,
+      'jsx-a11y': jsxA11yPlugin,
+      'no-barrel-files': barrelPlugin,
+      '@grafana': grafanaPlugin,
+      'testing-library': testingLibraryPlugin,
+    },
+    linterOptions: {
+      // This reports unused disable directives that we can clean up but
+      // it also conflicts with the betterer eslint rules so disabled
+      reportUnusedDisableDirectives: false,
+    },
+  },
   {
     files: ['**/*.{js,jsx,ts,tsx}'],
     rules: {

.betterer.ts

@@ -2,8 +2,6 @@ import { BettererFileTest } from '@betterer/betterer';
 import { ESLint } from 'eslint';
 import { promises as fs } from 'fs';
 
-import config from './.betterer.eslint.config';
-
 // Why are we ignoring these?
 // They're all deprecated/being removed so doesn't make sense to fix types
 const eslintPathsToIgnore = [
@@ -11,7 +9,6 @@ const eslintPathsToIgnore = [
   'public/app/angular', // will be removed in Grafana 12
   'public/app/plugins/panel/graph', // will be removed alongside angular in Grafana 12
   'public/app/plugins/panel/table-old', // will be removed alongside angular in Grafana 12
-  'e2e/test-plugins',
 ];
 
 // Avoid using functions that report the position of the issues, as this causes a lot of merge conflicts
@@ -75,17 +72,14 @@ function regexp(pattern: RegExp, issueMessage: string) {
 }
 
 function countEslintErrors() {
-  return new BettererFileTest(async (filePaths, fileTestResult, resolver) => {
+  return new BettererFileTest(async (filePaths, fileTestResult) => {
     // Just bail early if there's no files to test. Prevents trying to get the base config from failing
     if (filePaths.length === 0) {
       return;
     }
 
-    const { baseDirectory } = resolver;
-
     const runner = new ESLint({
-      overrideConfig: config,
-      cwd: baseDirectory,
+      overrideConfigFile: './.betterer.eslint.config.js',
       warnIgnored: false,
     });
 

eslint.config.js

@@ -1,6 +1,5 @@
 // @ts-check
 const emotionPlugin = require('@emotion/eslint-plugin');
-const { fixupPluginRules } = require('@eslint/compat');
 const importPlugin = require('eslint-plugin-import');
 const jestPlugin = require('eslint-plugin-jest');
 const jestDomPlugin = require('eslint-plugin-jest-dom');
@@ -47,6 +46,7 @@ module.exports = [
       'public/locales/**/*.js',
       'public/vendor/',
       'scripts/grafana-server/tmp',
+      '!.betterer.eslint.config.js',
     ],
   },
   // Conditionally run the betterer rules if enabled in dev's config
@@ -260,7 +260,7 @@ module.exports = [
   {
     name: 'grafana/alerting-test-overrides',
     plugins: {
-      'testing-library': fixupPluginRules({ rules: testingLibraryPlugin.rules }),
+      'testing-library': testingLibraryPlugin,
       'jest-dom': jestDomPlugin,
     },
     files: [

package.json

@@ -78,7 +78,6 @@
     "@betterer/eslint": "5.4.0",
     "@cypress/webpack-preprocessor": "6.0.2",
     "@emotion/eslint-plugin": "11.12.0",
-    "@eslint/compat": "^1.2.0",
     "@grafana/eslint-config": "8.0.0",
     "@grafana/eslint-plugin": "link:./packages/grafana-eslint-rules",
     "@grafana/plugin-e2e": "^1.11.0",

yarn.lock

@@ -2513,18 +2513,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@eslint/compat@npm:^1.2.0":
-  version: 1.2.3
-  resolution: "@eslint/compat@npm:1.2.3"
-  peerDependencies:
-    eslint: ^9.10.0
-  peerDependenciesMeta:
-    eslint:
-      optional: true
-  checksum: 10/5a8fc6ecb127a1ce757c2b94e4a71fd72939c3e9007eb80c0a819618e1c7cc98ffe3e5229a504c52e6f5b5dc0f6be3b899fa6a3dedb220cb4a02c8d5d0c333df
-  languageName: node
-  linkType: hard
-
 "@eslint/config-array@npm:^0.18.0":
   version: 0.18.0
   resolution: "@eslint/config-array@npm:0.18.0"
@@ -17195,7 +17183,6 @@ __metadata:
     "@emotion/css": "npm:11.13.5"
     "@emotion/eslint-plugin": "npm:11.12.0"
     "@emotion/react": "npm:11.13.5"
-    "@eslint/compat": "npm:^1.2.0"
     "@fingerprintjs/fingerprintjs": "npm:^3.4.2"
     "@floating-ui/react": "npm:0.26.28"
     "@formatjs/intl-durationformat": "npm:^0.6.0"