Port the eslint config from UDR and next-hashicorp

eslint.config.js

@@ -0,0 +1,88 @@
+const { node, browser } = require('globals')
+const pluginJs = require('@eslint/js')
+const tseslint = require('typescript-eslint')
+const pluginReact = require('eslint-plugin-react')
+const noBarrelFiles = require('eslint-plugin-no-barrel-files')
+
+module.exports = [
+	{
+		ignores: [
+			'.next',
+			'**/dist',
+			'eslint.config.js',
+			'content',
+			'public',
+			'vitest.config.mjs',
+			'playwright-report',
+		],
+	},
+	pluginJs.configs.recommended,
+	...tseslint.configs.recommended,
+	pluginReact.configs.flat.recommended,
+	{
+		settings: { react: { version: 'detect' } },
+	},
+	{ 
+		files: ['**/*.{js,ts,jsx,tsx}'],
+		languageOptions: { globals: { ...node, ...browser } },
+		plugins: { 'no-barrel-files': noBarrelFiles },
+		rules: {
+			// TypeScript's `noFallthroughCasesInSwitch` option is more robust (#6906)
+			'default-case': 'off',
+			// 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/291)
+			'no-dupe-class-members': 'off',
+			// 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/477)
+			'no-undef': 'off',
+			// Add TypeScript specific rules (and turn off ESLint equivalents)
+			// '@typescript-eslint/no-angle-bracket-type-assertion': 'warn',
+			'no-array-constructor': 'off',
+			'@typescript-eslint/no-array-constructor': 'warn',
+			'@typescript-eslint/no-namespace': 'error',
+			'no-use-before-define': 'off',
+			'@typescript-eslint/no-use-before-define': [
+				'warn',
+				{
+					functions: false,
+					classes: false,
+					variables: false,
+					typedefs: false
+				}
+			],
+			'no-unused-vars': 'off',
+			'@typescript-eslint/no-unused-vars': [
+				'warn',
+				{
+					args: 'none',
+					ignoreRestSiblings: true
+				}
+			],
+			'no-useless-constructor': 'off',
+			'@typescript-eslint/no-useless-constructor': 'warn',
+			// This is really verbose, and requires the author to add a lot of
+			// types that are already inferred by Typescript (so you'll see them in
+			// an IDE like VSCode just fine). We may want it eventually, but I
+			// suspect it will slow people down when doing page conversions. Note
+			// that `tslint:recommended` turns this kind of checking off.
+			'@typescript-eslint/explicit-function-return-type': 'off',
+
+			// Not necessary in Next.js (https://spectrum.chat/next-js/general/react-must-be-in-scope-when-using-jsx~6193ef62-4d5e-4681-8f51-8c7bf6b9d56d)
+            'react/react-in-jsx-scope': 'off',
+		},
+	},
+	{
+		files: ['**/*.js?(x)'],
+		rules: {
+			// For instances where we aren't using esmodules or TypeScript and therefore can't use import
+			'@typescript-eslint/no-require-imports': 'off'
+		},
+	},
+	{
+		files: ['**/*.ts?(x)'],
+		rules: {
+            'react/prop-types': 'off',
+            'react/no-array-index-key': 'warn',
+            'react/no-unknown-property': ['error', { ignore: ['class'] }]
+		},
+	},
+]
+