Migrate to ESLint flat config & neostandard

Author: renovate[bot]

.eslintrc.cjs

@@ -1,4 +1,4 @@
-/**
+/*
  * Copyright (C) NIWA & British Crown (Met Office) & Contributors.
  *
  * This program is free software: you can redistribute it and/or modify
@@ -15,22 +15,29 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/**
+/*
  * Eslint config for dist directory.
  *
  * Note: we can't keep it in there because it would get wiped by build.
  */
-module.exports = {
-  plugins: ['compat'],
-  extends: ['plugin:compat/recommended'],
-  env: {
-    browser: true,
-  },
-  parserOptions: {
-    sourceType: 'module',
-    // Don't need to worry about ECMA syntax as that's handled by Vite/ESBuild
-    ecmaVersion: 'latest',
+
+import { defineConfig } from 'eslint/config'
+import globals from 'globals'
+import compatPlugin from 'eslint-plugin-compat'
+
+export default defineConfig([
+  compatPlugin.configs['flat/recommended'],
+  {
+    linterOptions: {
+      noInlineConfig: true,
+    },
+    languageOptions: {
+      sourceType: 'module',
+      globals: {
+        ...globals.browser,
+      },
+      // Don't need to worry about ECMA syntax as that's handled by Vite/ESBuild:
+      ecmaVersion: 'latest',
+    },
   },
-  noInlineConfig: true,
-  reportUnusedDisableDirectives: false, // doesn't seem to work
-}
+])

eslintrc-dist.cjs renamed to dist.eslint.config.mjs

@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) NIWA & British Crown (Met Office) & Contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import { defineConfig } from 'eslint/config'
+import js from '@eslint/js'
+import globals from 'globals'
+import pluginVue from 'eslint-plugin-vue'
+import pluginVuetify from 'eslint-plugin-vuetify'
+import pluginCypress from 'eslint-plugin-cypress/flat'
+import noOnlyTests from 'eslint-plugin-no-only-tests'
+import neostandard, { resolveIgnoresFromGitignore } from 'neostandard'
+
+const cypressTestFiles = ['tests/e2e/**', 'tests/component/**']
+const unitTestFiles = ['**/*.spec.js']
+
+export default defineConfig([
+  // NOTE: neostandard includes various plugins
+  ...neostandard({
+    noJsx: true,
+    // Neostandard makes it easier to configure ignores than ESLint's way:
+    ignores: [
+      ...resolveIgnoresFromGitignore(),
+      '.yarn/',
+    ],
+  }),
+
+  js.configs.recommended,
+
+  ...pluginVue.configs['flat/essential'],
+
+  ...pluginVuetify.configs['flat/base'],
+
+  {
+    languageOptions: {
+      sourceType: 'module',
+      // Allow new ECMAScript syntax but not globals. This is because vite/esbuild
+      // transforms syntax to es2015 (at the earliest) but does not pollyfill APIs.
+      ecmaVersion: 'latest',
+      globals: {
+        ...globals.browser,
+      }
+    },
+    rules: {
+      '@stylistic/comma-dangle': ['error', {
+        arrays: 'only-multiline',
+        objects: 'only-multiline',
+        imports: 'only-multiline',
+        exports: 'only-multiline',
+        functions: 'only-multiline',
+      }],
+
+      'no-console': ['error', {
+        allow: ['warn', 'error'],
+      }],
+
+      'vue/multi-word-component-names': ['off'],
+
+      'promise/param-names': ['error'],
+      'promise/no-return-wrap': ['error'],
+    },
+  },
+
+  {
+    files: ['scripts/**', 'src/services/mock/**'],
+    languageOptions: {
+      globals: {
+        ...globals.node,
+      },
+    },
+    rules: {
+      'no-console': ['off'],
+    },
+  },
+
+  {
+    files: cypressTestFiles,
+    plugins: {
+      cypress: pluginCypress,
+    },
+    extends: ['cypress/recommended'],
+    rules: {
+      'cypress/unsafe-to-chain-command': ['off'],
+    }
+  },
+
+  {
+    files: unitTestFiles,
+    languageOptions: {
+      globals: {
+        ...globals.vitest,
+      },
+    },
+  },
+
+  {
+    files: [...unitTestFiles, ...cypressTestFiles],
+    plugins: {
+      'no-only-tests': noOnlyTests,
+    },
+    rules: {
+      'no-console': ['off'],
+
+      'no-only-tests/no-only-tests': ['error'],
+
+      // Don't complain about certain chai assertions:
+      'no-unused-expressions': ['off'],
+    },
+  },
+])

eslint.config.mjs

@@ -12,8 +12,8 @@
     "coverage:component": "COVERAGE=true yarn run test:component",
     "coverage:e2e": "COVERAGE=true yarn run test:e2e",
     "dev": "yarn run serve",
-    "lint": "eslint . --ext .js,.jsx,.mjs,.cjs,.ts,.tsx,.vue --ignore-path .gitignore",
-    "lint:compat": "eslint dist/ --no-eslintrc -c eslintrc-dist.cjs",
+    "lint": "eslint",
+    "lint:compat": "eslint dist/ -c dist.eslint.config.mjs",
     "preview": "node ./scripts/concurrently.cjs serve:jupyterhub preview",
     "serve": "node ./scripts/concurrently.cjs serve:jupyterhub serve:vue",
     "serve:vue": "vite --mode offline",
@@ -55,38 +55,37 @@
   },
   "devDependencies": {
     "@cypress/code-coverage": "3.14.0",
+    "@eslint/js": "9.24.0",
     "@vitejs/plugin-vue": "5.2.3",
     "@vitest/coverage-istanbul": "3.1.2",
     "@vue/test-utils": "2.4.6",
     "concurrently": "9.1.2",
     "cross-fetch": "4.1.0",
     "cypress": "14.3.2",
     "cypress-vite": "1.6.0",
-    "eslint": "8.57.1",
-    "eslint-config-standard": "17.1.0",
-    "eslint-plugin-compat": "4.2.0",
-    "eslint-plugin-cypress": "2.15.2",
-    "eslint-plugin-import": "2.31.0",
-    "eslint-plugin-n": "16.6.2",
+    "eslint": "9.24.0",
+    "eslint-plugin-compat": "6.0.2",
+    "eslint-plugin-cypress": "4.2.0",
     "eslint-plugin-no-only-tests": "3.3.0",
-    "eslint-plugin-promise": "6.6.0",
-    "eslint-plugin-vue": "9.33.0",
+    "eslint-plugin-vue": "10.0.0",
     "eslint-plugin-vuetify": "2.5.2",
     "express": "5.1.0",
     "express-ws": "5.0.2",
+    "globals": "16.0.0",
     "istanbul-lib-coverage": "3.2.2",
     "jsdom": "26.1.0",
     "json-server": "0.17.4",
+    "neostandard": "0.12.1",
     "nodemon": "3.1.10",
     "nyc": "17.1.0",
     "sass-embedded": "1.87.0",
     "sinon": "20.0.0",
-    "standard": "17.1.2",
     "vite": "6.3.4",
     "vite-plugin-eslint": "1.8.1",
     "vite-plugin-istanbul": "7.0.0",
     "vite-plugin-vuetify": "2.1.1",
-    "vitest": "3.1.2"
+    "vitest": "3.1.2",
+    "vue-eslint-parser": "10.1.3"
   },
   "peerDependenciesMeta": {
     "react": {

package.json

@@ -110,8 +110,8 @@
     {
       "groupName": "eslint packages",
       "matchPackageNames": [
-        "standard",
-        "eslint*"
+        "/^@?eslint/",
+        "*-eslint-parser"
       ],
       "automerge": true,
       "schedule": [

renovate.json

@@ -1,4 +1,3 @@
-/* eslint-disable no-console */
 const concurrently = require('concurrently')
 
 const args = process.argv.slice(2)

scripts/concurrently.cjs

@@ -158,7 +158,7 @@ export default {
   computed: {
     workflowLink () {
       return this.node.type === 'workflow'
-        ? `/workspace/${ this.node.tokens.workflow }`
+        ? `/workspace/${this.node.tokens.workflow}`
         : ''
     },
 

src/components/cylc/tree/GScanTreeItem.vue

@@ -81,7 +81,7 @@ export default {
     // dictionary of props for overriding default values
     propOverrides: {
       type: Object,
-      default: () => { Object() }
+      default: () => ({ })
     }
   },